Version 1.12 (2021.08.03)
Original instructions

INSTRUCTION MANUAL

N/NT/NL/NLT type
Closed Center Power ChuckDANGER
・This instruction manual is for production engineers andmaintenance personnel in charge of operation of this product.
When a beginner uses this product, receive instructions fromexperienced personnel, the distributor or our company.
・Before installing, operating or maintaining this equipment,
carefully read this manual and the safety labels attached tothe equipment. Failure to follow these instructions and safety
precautions could result in serious injury, death, or property
damage.
・Store this manual near equipment for future reference.
・If any questions related to safety arise about this manual,please confirm them with the distributor or our company.

Kitagawa Corporation
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,JapanTe l . +81-847-40-0561
Fax. +81-847-45-8911

Preface
This manual provides detailed information about how to safely and correctly use the power chuck (N / NT / NL / NLTtype) for a lathe.
Before starting to use this power chuck, read this manual carefully and always follow the instructions and warnings in"Important Safety Precautions" and "Precautions for Use" at beginning of the manual. Failure to follow theseprecautions could result in a serious accident.

Terms and Symbols Used for Safety Messages
In this manual, precautions for handling that are considered especially important are classified and displayed as shown below
depending on the damage of risk including the seriousness of the harm that could result. Please sufficiently understand themeanings of these terms and follow the instructions for safe operation.

Safety Alert Symbol
The triangle is the safety alert symbol used to alert you to potential safety hazards that could result in injury or death.

DANGER

Indicates a hazardous situation which, if you not avoided,
will result in death or serious injury.

WARNING

Indicates a hazardous situation which, if you not avoided,
could result in death or serious injury.

CAUTION

Indicates a hazardous situation which, if you not avoided,
could result in minor or moderate injury.

NOTICE

Indicates instructions which, if not avoided, could result indamage to the equipment or a shortened work life.

Liability and How to Use this ManualThis product is suitable for gripping a workpiece on the lathes or rotary tables. This product is equipped with the jaws toclamp the workpiece and they operate by means of a rotary cylinder. For any other applications, please contact us.
Our company will not assume responsibility for injury, death, damage, or loss resulting from not following the
instructions in this manual.
There are countless things that cannot or should not be done, and it is impossible to cover all of them in this manual.
Therefore, do not perform any actions unless they are specifically allowed in this manual. If any questions related tosafety arise about operation, control, inspection and maintenance which are not specified in this manual, please confirm
them with our company or distributor before performing them.

Guarantee and Limitation of Liability
The guarantee period of this product is 1 year after delivery.
Use the parts delivered by Kitagawa Corporation for all the parts including consumable parts. We will not assume
responsibility for injury, death, damage, or loss caused by usage of parts not manufactured by Kitagawa Corporation.
Additionally, if parts other than genuine parts manufactured by Kitagawa Corporation are used, this guarantee will becompletely invalid.
The chuck and cylinder from Kitagawa Corporation should be used together. If you must use a part not made by
Kitagawa, check with us or our distributor to be sure it is safe to do so. We will not be responsible for injury, death,damage or loss caused by use of a chuck or cylinder made by another company unless this use has been approved by
Kitagawa or its distributor.
1

Table of Contents
1. Structural Drawing and Parts List ………………………………………………………………

3

1-1. Type display
1-2. Structural drawing
1-3. Scope of product1-4. Parts list

Important Safety Precautions …………………………………………………………

6

3. Specifications ……………………………………………………………………………………

12

2.

3-1. Specifications
3-2. Relationship between gripping force and rotation speed
3-3. Relationship between gripping part center height, static griping force and input force /Relationship between top jaw mass moment and gripping force loss

4. Forming Soft Jaw ………………………………………………………………………………

26

4-1. Attachment of soft jaw
4-2. Forming soft jaw with outside diameter gripping
4-3. Forming soft jaw with inside diameter gripping
4-4. Forming method when you use forming jig

5. Usage ……………………………………………………………………………………………

30

5-1. Precautions during gripping work with chuck
5-2. Precautions during gripping work in irregular shape
5-3. Precautions related to usage of jaw
5-4. Precautions related to processing
5-5. Attachment of locator and jig

6. Maintenance and Inspection …………………………………………………………………

33

6-1. Periodic Inspection
6-2. Grease lubrication
6-3. Disassembling

7. Malfunction and Countermeasures ……………………………………………………………

36

7-1. In the case of malfunction
7-2. Where to contact in the case of malfunction

For Machine Tool Manufacturers (Chapter 8)

8. Attachment ………………………………………………………………………………………

37

8-1. Outline drawing of attachment
8-2. In the case that the back plate must be manufactured
8-3. In the case of with back plate
8-4. Attachment of chuck

9. Other Information ………………………………………………………………………………

44

9-1. About standards and orders
9-2. Information about markings of product9-3. About disposal

21 . Structural Drawing and Parts List
1−1 Type display
Type display as shown below

N- 06 A06 999
Design No.

Chuck nominal diameter（inch）

Type

Attachment shape
Straight spigot joint ：−
A2−5
：A05
A2−6
：A06
：A08
A2−8
A2−11
：A11
A2−15（Former JIS）：A15
A2−15（New JIS） ：C15

N- : 3 JAW
NT : 2 JAW
NL : 3 JAW（Long Stroke）

NLT 06 A6 999
Design No.
Attachment shape
Straight spigot joint ：−
A2−5
：A5
A2−6
：A6
A2−8
：A8
Chuck nominal diameter A2−11：A1（inch）Type

NLT : 2 JAW（Long Stroke）

Fig.1

1−2 Structural drawing
Master jaw
Body

Top jaw （Soft jaw. hard jaw.
special jaw included）

Stop bolt

Draw tube

Draw nut

Cover

Draw screw

Wedge Plunger（This is referred toas a plunger here in）
Attaching bolt

Click stop

4"、5"
3

T nut

6"〜24"

4"、5"

6"〜15"4"、5"

NT、NLT type

6"〜24"

N、NL type
Fig.2

1−3 Scope of productThis instruction manual is for the chuck part.
Chuck

CylinderDrain hose

Pressure adjusting
screw

Hydraulicpump

Flexible hose

Pressuregauge
Manual switchingvalveLine Filter

SOL.
Solenoid
valve

Tank

Fig.3

WARNING・To prevent the work from flying, safe design, maintenance and erroneous action prevention of the hydraulicsystem to maintain the gripping force of the chuck is extremely important. Thoroughly read the Important
Safety Precautions on and after page 6 in this manual.
・As for the cylinder, follow the instruction manual for the cylinder.
4

1−4 Parts list

20
23

25
22

4"、5"
6"〜24"

15

21

4

13

14
6
5
18
3

1

12

11 16 27

2

4"、5"

7

6"〜24"

24

10
19
17

8

26

9

28
29

Fig.4
Table 1
No.

Part name

Quantity

No.

Part name

Quantity

1

Body

1

16

Set screw

1

2

Wedge plunger

1

17

Set screw

1

3

Master jaw

2or3

18

Grease nipple

4

Soft jaw

2or3

19

Steel ball

1

5

Ｔ nut

1
2or3*

20

Handle

1*

6

Cover

1

21

Hex key

1*6

7

Draw screw

1

22

Hex key18Draw tube

2
1*

23

Hex key19Draw nut

1

24

Hex key

1

10Spring1

25

Hex key

1

11

Lead ball

1

26

Hex key112Stop bolt

2or3

27

Hex key

128

Back plate

1*

29

Socket head cap screw

3*7

13
14

Chuck attaching bolt
Socket head cap screw
Machine screw

5

*3

6

3or4*44or6
15
Jaw attaching bolt
*1. N-15 or more: 6 pieces.
*2. Exclude 4 and 5 .
*3. N-04, N-05, NL04 and NL05 : 3 pieces. NT04 and NT05 : 4 pices.
*4. 4 and 5 : Machine screw, 6 or more : Socket Head cap screw.
*5. 6 or more. (Exclude NL12)*6. 4 , 5 and NL12.
*7. Only supplied if there is a back plate.
5

2or3

7

2.

Important Safety Precautions

Important safety precautions are summarized below. Please read this section before firststarting to use this product.

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

Turn off main power supply before attaching, inspecting or replacing chuck,and before adding oil.
For All Users
・The chuck may start rotation suddenly,
and a part of the body or clothing may be
Main power supply
caught.

OFF
ON

Lathe

OFF

Close door before rotating spindle.
・If the door is not closed, you may touch
the rotating chuck or the work may fly out,
which is very dangerous. (In general, thesafety interlock function which allows
rotation only when the door is the manualmode or the test mode)

For All Users

Close
Lathe

During spindle rotation, do not turn off hydraulic pump power supply
and do not operate switching valve.
For All Users
・Cutting off hydraulic pressurecauses a drop in the gripping
force which could result in thework being released and flyingout.
・Operatingthemanualswitching valve or solenoid
valve will lead to a drop of
hydraulic pressure.

Manual switching valve
Jaw
closed

NO

Work

Jaw
open

ON
OFF

Solenoid valve
6

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

Do not allow the rotation speed of the chuck to exceed the maximum allowablespeed limit. (Refer to pages 16-25)
For All Users
・If the rotation speed of the chuck exceeds
the rotation speed limit, this is very
dangerous as the chuck and work will flyout.

Fly outWork

The input force of the chuck (piston thrust, pulling force of the draw bar)
must not exceed the allowable maximum input force.
For All Users(Refer to pages 16-25)
・Input must match the specification of
the chuck.
・Adjust the hydraulic pressure to thecylinder so that the input force, which
determines the gripping force of thechuck, does not exceed.
・Excessive input force can lead tobreakage of the chuck, which is very
dangerous, as the chuck can work
can be damaged and fly out.

CylinderDraw bar

Fly out

Allowable maximum
input force or less

Work
Chuck

Keep the height of the jaw within the range specified in the gripping force limit table (Refer to page 20-24).
If you must use a jaw taller than a standard soft jaw, use less than the input (piston
For All Users
thrust force, draw bar drawing force) specified in the gripping force limit table.
・Do not use a jaw of a height out of
the range of the gripping force limit
table or a jaw with mass moment outof the range of the gripping force
limit table. The chuck will break andthe chuck and work will break and flyout.

Standard soft
jaw height

Special top jaw height

Lower the hydraulicpressure when using
a tall jaw

DOW

N

Work

7

PRESSURE
GAUGE

Important Safety Precautions

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

When the protrusion of the work is long, support it withthe steady rest or center.

For All Users

・If the protrusion is long, the tip of the work can turn and the work fly out.
Tail stock

CenterDetermine the gripping force required for processing by the machine tool manufacturer or user,
and check that the required gripping force is provided before processing.
For All Users(Refer to pages 16-25 and cylinder manual)・Adjust the hydraulic pressure to thecylinder to obtain the required gripping
force. If the gripping force is insufficient,
this is dangerous as the work will fly out.

Fly outWork

Use of a chuck and cylinder that cannot be used together safely may cause
the cylinder to break at high pressure resulting in the chuck
For All Users
and work flying out.
・Check that the chuck and the cylinder are in the safe combination when using at high pressure
with our company or the distributor. Especially when the cylinder of our company and a highpressure chuck of other company are combined, confirmation is necessary.
・If one of the abnormal events shown below
occurs during operation, immediately stop the
CylinderChuckmachine and consult with our company or the
Fly out
distributor.
・ The work slips.
・ Loss of accuracy.
・ The work begins to chatter.
Work・ The machine's vibration significantly increases.
・ The griping force does not rise even if hydraulicpressure is raised.
8

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

In the case of processing a significant unbalanced work,
lower the rotation speed.
・Unbalanced work generates dangerous
centrifugal forces and the work could flyout.

For All Users

Unbalanced work

Fly out

Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, thebolt will break, which is dangerous as the chuck or work will fly out. Use the
For All Users
bolts attached to the chuck, and do not use bolts other than these.
・If the torque is insufficient or excessive, the bolt will break, whichis dangerous as the chuck or work will fly out.
・Fix the lathe spindle or the chuck when you tighten bolts. Your
hand could slip and get injury when you work without fixing thespindle.
・You cannot control the torque by a hex key. You must use atorque wrench for torque control.

Specified torque forsocket head cap screw
Bolt size
M6
M8
M10
M12
M14
M16
M20
M22
M24

Tightening torque13 N・m33 N・m73 N・m
107 N・m
171 N・m
250 N・m402 N・m539 N・m
666 N・m

F＝127（N）（13kgf）

Tightening torque
T＝F×L＝127×0.1＝12.7（N・m）

0.1（

m）

L＝

・Tightening torque is moment of force when you tighten a bolt. Tightening torque= F×L.

9

Important Safety Precautions

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

Provide sufficient strength for the draw bar (Refer to pages 38-39).
Provide sufficient screw depth for the draw bar.
For Machine Tool Manufactures
Firmly tighten the draw bar.
・If the draw bar break, the gripping force isinstantly lost and this is dangerous as work will
fly out.
・If the screw depth of the draw bar isinsufficient, the screw will break and thegripping force will be lost instantly, and this isdangerous as work will fly out.
・If the engagement of the screw of the draw bar
is loose, vibration may occur resulting in
breakage of the screw. If the screw breaks, thegripping force will be lost instantly, which isdangerous as the work will fly out.
・If the draw bar is unbalanced, vibration occurs,
the screw is broken and the gripping force will
be lost instantly, which is dangerous as thework will fly out.

Cylinder adapter

Chuck

Draw bar

CylinderBack plate

Use a cylinder with a lock valve (safety valve, check valve) incorporated in case of
sudden hydraulic pressure drop due to blackout, malfunction of the hydraulic pump, etc.
Further, use a solenoid valve with a circuit that retains the
For Machine Tool Manufactures
gripping position when no current is carried.
・If the hydraulic pressure suddenly drops
due to blackout or malfunction of thehydraulic pump, etc., this is dangerous aswork will fly out.
・Lock valve retains the hydraulic pressure
inside the cylinder temporarily, when thehydraulic pressure suddenly drops due toblackout or malfunction of the hydraulicpump, etc.

Lightning＝Blackout

Loosening

Gripping

Lock valve
CylinderP

Solenoid valve

The grlipping position
must be retained.

10Important Safety Precautions

WARNING

Failure to follow the safety precautions below could result inserious injury or death.

Do not modify the chuck in a way not permitted
by the manufacturer.

For All Users

・It may not only break the chuck but thechuck and the work may fly out, which isdangerous.
・If you attach a locator or jig on the chuck
body surface, only process work in an
acceptable range (Refer to page 31).

NO

Periodically supply adequate grease (Refer to page 33). Turn off power before
adding grease.
For All Users
・Insufficient grease supply lowers thegripping force, causes operation failure due
to lower hydraulic pressure, lowers thegripping precision, and causes abnormal
wearing and seizing, etc.
・This is dangerous as the work could fly out
from a drop in the gripping force.

Grease gun
Grease nipple

Do not operate the machine wearing gloves,a necktie, and other loose
For All Users
clothing or jewelry.

Do not operate the machine after
drinking alcohol or
For All Users
taking medication.

・Dangerous since it will
be caught.

・Dangerous sincethese lead tooperation mistakes
and misjudgment.

Alcohol

Medication

Do not grip a chuck with a chuck.
・Because it is easy to confuse the specifications ofeach chuck and the protrusion become long and is
apt to raise rotation speed, it is apt to exceed thespecifications of the base chuck. The chuck may
break and the chuck or work could fly out.

11

For All Users

3 . Specifications
3−1 Specifications

Table 2-1

・ N type
Type

N-04

N-05

N-06

N-08

N-10

Plunger stroke

mm

15

15

20

21

25

Jaw stroke（in diameter）

mm

6.4

6.4

8.5

8.8

8.8

8.2
(836)
22.8
(2325)

8.2
(836)
25.2
(2570)

18(1835)
52.5(5353)

25(2549)
75(7648)

29(2957)
108(11013)

6000

5500

5270

4760

4010

27

29

35

42

46

mm

φ6〜110

φ16〜135

φ15〜165

φ23〜210

φ24〜254

kg

4.1

6.2

13

25

37

2

kg・m

0.008

0.015

0.045

0.138

0.300

Hydraulic

Ｙ0715R

Ｙ0715R

Ｙ1020RＹ1225RＹ1225R

Air

AY1315R

AY1315R

AY1720R

AY2225R

AY2225R

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed
Standard soft jaw heightmm(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

2.8
2.4
2.6
2.5
MPa
2.4
MaximumHydraulic pressure(28.6)(24.5)(26.5)(25.5)(24.5)(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.

・ N type

Table 2-2
N-12

N-15

N-18

N-21

N-24

Plunger stroke

Type
mm

30

35

35

35

35

Jaw stroke（in diameter）

mm

10.5

16

16

16

16

41
(4181)
156(15907)82(8362)
249(25391)

82(8362)
249(25391)

82(8362)
273(27838)82(8362)
273(27838)

3380

3040

2710

1940

1760

mm

54

61

61

71

71

mm

φ26〜304

φ72〜381φ133〜450

φ69〜530

φ152〜610

kg

57.3

96

124

180

223

kg・m

2

0.725

1.80

2.35

4.80

6.925

HydraulicＹ1530R

Ｙ2035R

Ｙ2035R

Ｙ2035R

Ｙ2035R

Air

−

−

−

−

−

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed
Standard soft jaw height(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

3.2
2.7
3.2
3.2
3.2
MPa
MaximumHydraulic pressure(32.6)(27.5)(32.6)(32.6)(32.6)(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.
12・ N-A type

Table 3-1
Type

N-06A05

N-08A06

N-10A06 N-10A08 N-12A06 N-12A08 N-15A08 N-15A11

Plunger stroke

mm

20

21

25

30

35

Jaw stroke（in diameter）

mm

8.5

8.8

8.8

10.5

16

18
(1835)
52.5(5353)

25(2549)
75(7648)

29(2957)
108(11013)41(4181)
156(15907)82(8362)
249(25391)

5270

4760

4010

3380

3040

35

42

46

54

61

mm

φ15〜165

φ23〜210

φ24〜254

φ26〜304

φ72〜381

kg

14

27

40

67

66

105

103

2

kg・m

0.005

0.147

0.335 0.327

0.760

0.752

1.95

1.87

Hydraulic

Ｙ1020RＹ1225RＹ1225R

Ｙ1530R

Ｙ2035RAir

AY1720R

AY2225R

AY2225R−−

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed
Standard soft jaw heightmm(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

3.10
2.58
2.84
2.81
MPa
2.48
MaximumHydraulic pressure(31.6)(26.3)(29.0)(28.7)(25.3)(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.

・ N-A type

Table 3-2
Type

N-18A08

N-18A11

N-21A08

N-21A11

N-21A15

N-24A11 N-24A15

Plunger stroke

mm

35

35

35

Jaw stroke（in diameter）

mm

16

16

16

82
(8362)
249(25391)

82(8362)
273(27838)82(8362)
273(27838)

2710

1940

1760

mm

61

71

71

mm

φ133〜450

φ69〜530

φ152〜610

kg

134

131

201

198

190

241

234

2

2.47

2.42

5.17

5.12

4.97

7.37

7.05

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed
Standard soft jaw height(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

kg・mHydraulic
Air

Ｙ2035R

Ｙ2035R

Ｙ2035R

―

―

―

3.10
(31.6)

3.10(31.6)

3.10(31.6)MPa
MaximumHydraulic pressure(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.
13

・ NT type

Table 4
Type

NT04

NT05

NT15

Plunger stroke

mm

15

15

35

Jaw stroke（in diameter）

mm

6.4

6.4

16

5.3
(540)
15.2
(1550)

5.3
(540)
16.8
(1713)

54.7(5578)
166(16927)

6000

5500

3040

27

29

61

mm

φ7〜110

φ20〜135

φ80〜381

kg

3.8

5.8

93

2

kg・m

0.007

0.013

1.79

Hydraulic

Ｙ0715R

Ｙ0715R

Y2035R

Air

AY1315R

AY1315R−

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed
Standard soft jaw heightmm(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

1.68
1.68
2.1
MPa
MaximumHydraulic pressure(17.1)(17.1)(21.8)(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.

・ NL type

Table 5
Type

NL04

NL06

NL08

NL10

NL12

NL18

Plunger stroke

mm

15

20

25

28

30

40

Jaw stroke（in diameter）

mm

12.1

13

16.2

18.1

19.4

26

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed

10(1020)
14.4(1468)

21(2141)
39(3977)

30(3059)
60(6118)

40(4079)
81(8260)

54(5506)
111(11300)91(9279)
186(18966)

5000

4300

3600

3100

2500

2100

mm

27

35

42

46

54

61

mm

φ9〜110

φ21〜165

φ21〜210

φ24〜254

kg

4.1

12

22.9

34.6

60

124

kg・m

2

0.008

0.045

0.138

0.300

0.725

2.35

Hydraulic

Ｙ0715R

Ｙ1020RＹ1225R

Ｙ1530R

Ｙ1530R

Y2050R

Air

AY1315R

AY1720R

AY2225R

−

−

―

2.9
(29.6)

3.0(30.2)

2.9(29.6)

2.8(28.6)

3.6(36.7)

3.5(35.9)

Standard soft jaw height(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

φ29〜304 φ122〜450

MPa
MaximumHydraulic pressure(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.
14

・ NLT type

Table 6
Type

ＮLT06

ＮLT08

ＮLT10

ＮLT12

Plunger stroke

mm

20

25

28

30

Jaw stroke（in diameter）

mm

13

16.2

18.1

19.4

14
(1427)
26(2651)

20(2039)
40(4078)

27(2753)
54(5506)

36(3671)
74(7546)

4300

3600

3100

2500

35

42

46

54

mm

φ25〜165

φ26〜210φ30〜254

φ36〜304

kg

12.5

24

35.5

60.5

2

kg・m

0.043

0.133

0.293

0.708

Hydraulic

Ｙ1020RＹ1225R

Ｙ1530R

Ｙ1530RAir

AY1720R

AY2225R−−

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed
Standard soft jaw heightmm(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

2.06
2.03
1.93
2.50
MPa
MaximumHydraulic pressure(21.0)(20.7)(19.7)(25.5)(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.

・ NL-A type

Table 7Type

NL06A05

NL08A06

NL10A06

NL10A08

NL12A06

NL12A08

Plunger stroke

mm

20

25

28

30

Jaw stroke（in diameter）

mm

13

16.2

18.1

19.4

21
(2141)
39(3977)

30(3059)
60(6118)

40(4079)
81(8260)

54(5506)
111(11319)

4300

3600

3100

2500

mm

35

42

46

54

mm

φ21〜165

φ21〜210

φ24〜254

φ29〜304

kg

14.2

24.9

37.6

63

kg・m

2

0.050

0.147

Hydraulic

Ｙ1020RＹ1225RAir

AY1720R

AY2225R−−

2.96(30.2)

2.93(29.9)

2.75(28.0)

3.62(36.9)

kN
Allowable maximum input force (kgf)kN
Maximum static gripping force (kgf)-1
Allowable maximum
minrotation speed
Standard soft jaw height(Z axis)Gripping range(outside diameter gripping)Mass(standard soft jaw included)
Moment of inertia
Matching cylinder

0.342

0.327

Ｙ1225R

0.760

0.752

Ｙ1530R

MPa
MaximumHydraulic pressure(kgf／cm2)(with matching cylinder)
Balance quality
G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50℃ / −10〜＋40℃
Operating temperature
2
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.
153−2 Relationship between gripping force and rotation speed
１．Maximum static gripping force
The static gripping force is the gripping force when the chuck is at a stop.
The power chuck has a mechanism to convert input force (piston thrust force, draw bar drawing force) from the cylinder
to gripping force. Therefore, the gripping force when the allowable maximum input force becomes the maximum static
gripping force.
However, the gripping force is different depending on the state of grease lubrication, grease in use, height of the jaw,
etc. The maximum static gripping force specified in thestandard soft jaw
AB
A=B
specification is the value under the following conditions:・The Kitagawa standard soft jaw is used as the jaw.
・The attaching bolts of the soft jaw are tightened at
the specified torque. (Refer to page 9)・The numerical values are obtained with the Kitagawa
Allowable
gripping force meter . The gripping position of the maximum
gripping force meter is at a position 1/2 of the height input forceof the soft jaw top surface (height from the chucksurface to the top surface of the jaw).
Kitagawa gripping
・CHUCK GREASE PRO is used. (Refer to page 33).
force meter・A variable displacement pump with the discharge
volume of 20 liters/min or more is used as thehydraulic source. The pressure is set by the pressure
control equipment of the pump itself, or the pressure
Tighten at specified torquereduction valve equipped separately.
GREASE LUBURICATION

Fig.5

２．Allowable maximum rotation speed
IIn the case of outside diameter gripping, when the chuck is rotated, the gripping force lowers due to the centrifugal
force of the top jaw. Therefore, the rotation speed when the dynamic gripping force (gripping force during rotation)
becomes approximately 1/3 of the maximum static gripping force is set as the allowable maximum rotation speed.
Actually measured values are indicated for models N (N･A) and NT, and theoretical values for models NL (NL･A) andNLT(NLT･A). The centrifugal force is different depending on the mass of the top jaw and the barycentric position as wellas the rotation speed. The allowable maximum rotation speed specified in the specification is the value under thefollowing conditions:・The Kitagawa standard soft jaw is used.
・Grip the gripping force meter in the center of the jaw stroke, and at this point, the soft jaw is attached at the position
where the periphery side end of the soft jaw and the chuck periphery are almost lined up.
・The numerical values are obtained by the Kitagawa gripping force meter. The gripping position of the gripping force
meter is at a position 1/2 of the height of the soft jaw top surface (height from the chuck surface to the top surface ofthe jaw).

DANGERTo avoid serious accidents caused by the chuck or work flying out:・Determine the gripping force required for processing by the machine tool manufacturer or user, and check thatthe required gripping force is provided before processing. The gripping force of the chuck must not exceed the
maximum static gripping force.
・Determine the rotation speed required for processing by the machine tool manufacturer or user based on thegripping force required for the processing. The rotation speed at this point must not exceed the allowablemaximum rotation speed.

NOTICE留
意・When determining the cutting conditions, refer to pages 17-25.
・Pay attention since the gripping force is different depending on the state of the oil supply, grease in use, height of
the jaw, performance of the pump and the pressure reducing valve, piping state, etc.

16

3．Relationship between gripping force and rotation speed
As the rotation speed becomes higher, the centrifugal force of the jaw increases and the gripping force lowers. The
curves displayed in Fig. 6〜9 shows relationships between the rotation speed and the centrifugal force when using thestandard soft jaw. The centrifugal force differs significantly depending on the size and shape of the top jaw and theattaching position, therefore, when the rotation speed is high, actual measurement using a Kitagawa gripping force
meter is required.

Input force
8.2kN

7kN
6kN
5kN
4kN
3kN

15
10
5

Limit
0

N-05

25.2

N-04

25
22.8
20

N typeGripping force(kN)

Gripping force(kN)

Fig.6

1000

2000

3000

4000

5000

Input force
8.2k
N
7kN

20

6kN
5kN
4kN

15
10

3kN
5

6000

Limit
0

1000

ー１

50

18kN
16kN
14kN
12kN
10kN
8kN
6kN

40
30
20

5270

10
1000

2000

3000

4000

25kN
23kN
21kN
19kN
17kN
15kN
13kN
11kN
9kN

60
50
40
30
20

5000

Limit
1000

0

ー１

40
20

140

4010

Limit

0

1000

N-12

160

Input force

60

2000

3000

4000

120
100
80
60
40

Limit

0

1000

−１

N-18

3000

Input force

249

Input force

82kN
70kN

200

70kN
60kN

50kN
40kN

100

2000

3380

−１

82kN

200

4760

Rotation Speed：ｍｉｎ (r.p.m)

30kN

20kN

3040

Gripping force(kN)

Gripping force(kN)

249

4000

41kN Input force
37kN
33kN
29kN
25kN
21kN
17kN
13kN

20

Rotation Speed：ｍｉｎ (r.p.m)

N-15

3000
ー１

29kN
26kN
23kN
20kN
17kN
14kN
11kN
8kN

80

2000

Rotation Speed：ｍｉｎ (r.p.m)

Gripping force(kN)

Gripping force(kN)

N-10

5500

5000

Input force

Rotation Speed：ｍｉｎ (r.p.m)
120
108
100

4000

10

Limit

0

N-08

80
75
70

Input force

52.5

3000

Rotation Speed：ｍｉｎ (r.p.m)

Gripping force(kN)

Gripping force(kN)

N-06
60

2000

ー１

Rotation Speed：ｍｉｎ (r.p.m)

60kN

50kN
40kN

100

30kN
20kN

Limit

Limit
0

1000

2000

3000

0

1000

−１

N-21

Input force

273

82k

N

200

100

70k
N
60kN
50kN
40kN

30kN

1940
−１

Rotation Speed：ｍｉｎ (r.p.m)

17

Input force
N

200

100

70k
N
60kN
50kN
40kN

30kN
20kN

Limit
1000

N-24
82k

20kN

0

2710

Rotation Speed：ｍｉｎ (r.p.m)

Gripping force(kN)

Gripping force(kN)

273

2000
−１

Rotation Speed：ｍｉｎ (r.p.m)

0

Limit
1000

1760
−１

Rotation Speed：ｍｉｎ (r.p.m)

Fig.7NT04

NT05

Input force

15.2

10

Input force

16.8

5.3k
5kN N
4.5k
N
4kN
3.5k
N
3kN
2.5k
N

Gripping force(kN)

Gripping force(kN)NT type

5.3k
5kN N
4.5k
N
4kN
3.5k
N
3kN
2.5k
N

10

Limit
0

1000

2000

3000

4000

5000

Limit
0

6000

1000

−１

3000

4000

5000

−１

Rotation Speed：ｍｉｎ (r.p.m)

Rotation Speed：ｍｉｎ (r.p.m)

NT15

200
175

Gripping force(kN)

2000

5500

Input force

150

54.7
kN
50k
45k N
N
40k
N
35k
N
30k
25k N
20k N
N

125
100
75
50
25

Limit

0

500

1000

1500

2000

2500

3040

−１

Rotation Speed：ｍｉｎ (r.p.m)

Fig.8

NL type

NL04
Input force

10k
N
9kN

39

8kN

10

7kN

6kN
5kN
4kN

Limit

Gripping force(kN)

Gripping force(kN)

14.4

NL06

Input force

21kN
19kN
17kN
15kN
13kN
11kN
9kN
7kN

30

20

10

4300

Limit
0

1000

2000

3000

4000

5000

0

1000

−１

30k
N
27k
N
24k
N
21k
N
18k
N
15kN
12kN
9kN

40
30
20

Gripping force(kN)

Gripping force(kN)

81

Input force

50

10

NL10

1000

2000

32kN
28kN
24kN

16kN

3000

ＮＬ12

8kN

0

3600

1000

Input force
200

25kN

20kN
15kN

20

Limit
0

500

3000

−１

30kN

40

2000

Rotation Speed：ｍｉｎ (r.p.m)

Gripping force(kN)

Gripping force(kN)

60

3100

Limit

54k
N
50k
N
45k
N
40kN
35kN

80

20kN

12kN

−１

111

Input force

50

Rotation Speed：ｍｉｎ (r.p.m)

100

4000

40kN
36kN

Limit

0

3000

Rotation Speed：ｍｉｎ (r.p.m)

NL08
60

2000

−１

Rotation Speed：ｍｉｎ (r.p.m)

1000

1500
−１

2000

Rotation Speed：ｍｉｎ (r.p.m)

2500

175
150
125
100
75
50

NL18
Input force

91kN
80k
70kN N
60k
50k N
40kN N
30kN

25
0

Limit
2100

1000
−１

Rotation Speed：ｍｉｎ (r.p.m)18

Fig.9 NLT type

NLT08

40

1
13kN4kN
12kN
11kN
10kN
9kN
8kN
7kN
6kN

20

10

Limit
0

1000

2000

3000

12kN
10kN

20

1000

74
70

27kN

30
20

14kN
11kN

10

5kN

23kN
20kN
17kN

8kN

0

3100

Limit

1000

2000

2000

ー１

3000

3600

Rotation Speed：ｍｉｎ (r.p.m)

Input force

40

N

8kN
6kN

10

0

Gripping force(kN)

Gripping force(kN)

NLT10

14k

4300

4000

ー１

N
18k
N
16k
N

30

Rotation Speed：ｍｉｎ (r.p.m)

5450

Input force
20k

Input force
Gripping force(kN)

Gripping force(kN)

NLT06
26

NLT12

60
50
40
30
20

Input force

36
33kN kN

3
27kN 0kN

24kN

18kN 21kN
12kN 15kN

10

Limit

0

3000

ー１

1000

2000

2500

ー１

Rotation Speed：ｍｉｎ (r.p.m)

Rotation Speed：ｍｉｎ (r.p.m)

DANGER・In the case of processing a considerably unbalanced work, lower the rotation speed. The work will fly out and this isdangerous.
・Vibration is generated if there is unbalance due to the work and the jig, etc. Vibration decreases process precision andshortens the working life of the chuck, even possibly breaking it. Correct the unbalance by using a balance weight,
etc., or lower the rotation speed for use.
・In the case of heavy cutting at high rotation speed, vibration is easily generated in the same manner as the unbalanceof the chuck, therefore, set the cutting conditions appropriate for the dynamic gripping force and machine rigidity.

3-3 Relationship between gripping part center height, static griping force and input
force / Relationship between top jaw mass moment and gripping force loss
If the gripping part center height of the used top jaw (dimension H in Fig. 10) is higher than the gripping part center height ofthe standard soft jaw, a large load is applied to the master jaw, T nut, jaw attaching bolts, etc. To prevent these parts frombeing broken, it is necessary to use the machine by using a lower input force than the allowable maximum input force.
Additionally, if the top jaw is larger and heavier, the centrifugal force generated at the top jaw will increase. It is necessary to
examine the dynamic gripping force considering the centrifugal force and to use the machine at a rotation speed that canwithstand the cutting force.

r

r

G

G

A

Chuck

Work

Chuck

H

G: Center of mass of the top jaw
m: Mass of the top jaw
r : Distance from the center of mass of the top jaw to the chuck center
H : Gripping center heightFig.1019

B

A=B

DANGER・Keep the height of the top jaw within the range of the gripping force limit table. (Refer to Fig.11-14)
・If a top jaw is taller than the standard soft jaw, use it at the input force (piston thrust force, draw bar drawing
force) specified in the gripping force limit table. If it is used without lowering the input, the chuck will break andthis is dangerous as the chuck and work will fly out.

Fig.11

N typeInput force

15.2
15

-1

Static gripping force（kＮ）

Gripping force loss（kＮ）

N-04

n
mi n-1
i00
60 00 m in-1
55 0 m
-1
0
50
in
0m
-1
450
in
-1
0m
400
min
0
-1
35 0
in
m
0
0
30
-1
2500 min -1
2000 min -1
1500 min

10

5

0

10

20

Standard soft top jaw

30

8.2k

22.8

7kN

6kN
5kN
4kN

10

3kN

14.5
40

Limit

N

20

0

10

Mass moment of top jaw
m×r×3（㎏・㎜）2720Standard soft top jaw

30

Static gripping force（kＮ）

Gripping force loss（kＮ）

16.8
15

-1

min in-1
-1
00
in
0m
0m
500
-1
450
-1
min
4000 3500 min
-1
in
m
0
0
-1
30
2500 min -1
2000 min

55
10

5

0

10

20

30

Standard soft top jaw

40

50

Input force
25.2

30
25
20
15
10
5
0

20

40

5kN

10

3kN

15.5

Standard soft top jaw

100

52.5

50

-1

in
00m

-1

000min

3

20
10

0

50

100

Limit

16kN

10kN

30

8kN

6kN

20
10

35

20

10

0

Static gripping force（kＮ）

Gripping force loss（kＮ）

min

40
-1
min
3500

Standard soft top jaw-12500min -1
2000min -1
1500min -1
1000min
150

200

50

30

40

50

Gripping part center height H（㎜）

0

30

40

Input force

Standard soft top jaw

-1

476

18kN

19
120

50
40

30

14kN
12kN

40

Mass moment of top jaw
m×r×3（㎏・㎜）

N-08

29

20

Gripping part center height H（㎜）

-1

80

10

Standard soft top jaw

in
3500m
-1
min
0
0
0
3
-1
2500min -1
2000min -1
1500min -1
1000min
60

Limit

4kN

0

-1

in
0m -1
52700min
-1
50
0min
450
-1
min
4000

N

7kN
6kN

60

Static gripping force（kＮ）

Gripping force loss（kＮ）

35

8.2k

20

Mass moment of top jaw
m×r×3（㎏・㎜）

N-06

50

Gripping part center height H（㎜）
30

N-05

40

Input force

80

75

70

Limit

25kN
23kN
21kN
19kN
17kN
15kN
13kN
11kN
9kN

60
50
40
30
20
10

23
250

Mass moment of top jaw
m×r×3（㎏・㎜）

280

0

10

20

Standard soft top jaw

42
30

40

50

60

70

80

Gripping part center height H（㎜）

20

120

60

40
30
20

-1

n

i
0m

1

40

50

-1

in
0m
-1
350
min
3000
-1
in
2500m

-1

2000min-1
1500min -1
1000min

10
0

Static gripping force（kＮ）

Gripping force loss（kＮ）

N-10

72
70

100

200

300

Standard soft top jaw

Limit

23kN

80

20kN
17kN

60

14kN
11kN

40

8kN

20
25

500

400

Input force

29kN
26kN

108

100

0

560

46

20

40

60

80

Standard soft top jaw
Gripping part center height H（㎜）Mass moment of top jaw
m×r×3（㎏・㎜）

Input force
Static gripping force（kＮ）

Gripping force loss（kＮ）

N-12

160

104
100
-1

n
mi

80

80

33

-1

in

0m
300

60

-1

min

2500

40

-1

in

2000m

-1

1500min-1
1000min

20

0

200

400

Standard soft top jaw

600

800

140
120

80

40
20

29

0

46.5

10 20 30 40 50 60 70 80

Standard soft top jaw

Gripping part center height H（㎜）Input force

166
160

250

-1

Static gripping force（kＮ）

Gripping force loss（kＮ）

Limit

37kN
33kN

17kN
13kN

60

Mass moment of top jaw
m×r×3（㎏・㎜）

N-15

41kN

29kN
25kN
21kN

100

1200

1000

156

n n
i
mi
-1
40 0m
in
30 280-10m
05
20min -1
220 0min200-1
in
1700m min-1
0
0
15
-1
1200min-1
1000min -1
700min

140
120
100
80
60
40
20
0

-1

500

Standard soft top jaw

1500

1000

2000

82kN

249

60kN

150

50kN

100

30kN

40kN

20kN

50

61

31

2500

Limit

70kN

200

0

3000

20

40

Standard soft top jaw

60

80

100

Gripping part center height H（㎜）Mass moment of top jaw
m×r×3（㎏・㎜）

Input force

120

-1

n

mi

10

27

140

250
-1

in
-1
0m
0min -1
220
min
2000

240

100

-1

in
1700m in-1
1500m
-11200min -1
1000min-1
700min

80
60
40
20
0

Static gripping force（kＮ）

Gripping force loss（kＮ）

N-18

166
160

500

1500

1000

Standard soft top jaw-1

500min

2000

2500

82kN

249

Limit

70kN

200

60kN

150

50kN

100

30kN

40kN

20kN

50

31
0

3000

61

20

40

60

Mass moment of top jaw
m×r×3（㎏・㎜）

Gripping force loss（kＮ）

160

Static gripping force（kＮ）

N-21

-1

n
mi -1
40 n
19 0mi
0
-1
18
in
0m
150

140
120
100
80

-1

min -1
1200
in
1000m
-1
700min-1
500min

60
40
20
0

1000

2000

Standard soft top jaw

3000

4000

273
250

7000

Limit

70kN
60kN

200

50kN

150

40kN

30kN

100

20kN

50

-1

6000

Mass moment of top jaw
m×r×3（㎏・㎜）

21

82kN

300min
5000

100

Input force

300
182

80

Standard soft top jaw
Gripping part center height H（㎜）

0

20

36
40

Standard soft top jaw

71
60

80

100

Gripping part center height H（㎜）

300
182
160
-1

140

n
-1
-1
mi
in
in
60
17 1600m 500m
-1
1
min
1300

120
100
80

-1

in

1000m

60

-1

700min40-1500min-1
300min

20
0

2000

1000

3000

Standard soft top jaw

4000

5000

6000

250

70kN
60kN

200

50kN

150

40kN

30kN

100

20kN

50
36
0

7000

Fig.1220

Standard soft top jaw

71

40

60

Input force
15.2
15

Static gripping force（kＮ）

10

-1

-1
n
mi
in -1
00 0 m
0
6 550
min
-1
00
in
50
-1
0m
450
in
0m
-1
400
min
3500
-1
in
3000 m-1
m
2500 in -1
n
mi
00
20
-1
1500 min

5

0

10

20

Standard soft top jaw

5.3k
N
5kN
4.5kN

3.5kN

10

3kN
2.5kN

2kN

5

0

10

27
20

30

Static gripping force（kＮ）

Gripping force loss（kＮ）-1

min in-1
00
-1
0m
55
in
500
-1
0m
450
min
-1
4000
min
3500
-1
m
3000 in -1
2500 min

10

5

-1

2000 min010Standard soft top jaw

20

30

40

15

15.5
0

10

40
20

-1

n
mi -1
40 in
30 00m in-1
-1
28 00m-1
25
0min in
220 2000m -1
in
-1
m
0
170 500min-1
1-1
1200min-1
1000min
700min0500Standard soft top jaw

1000

1500

2000

2500

Gripping force loss（kＮ）

3000

Mass moment of top jaw
m×r×2（㎏・㎜）

Fig.13

6
4
2
0

-1

10

20

50

60

Input force

200

Limit
54.7kN

166
150

46.7kN40kN
33.4kN
26.7kN

100

20kN
13.3kN

50

61

31
0

20

Standard soft top jaw

NL type

in
-1
0m
500
min
-1
4500
min
0
-1
0
0
4
in
-1
3500 m3000 min -1
2500 min -1
2000 min-1
1500 min -1
1000 minStandard soft top jaw

40

40

60

80

100

Gripping part center height H（㎜）

9.6
8

30

Gripping part center height H（㎜）Static gripping force（kＮ）

60

29

20

Standard soft top jaw

Static gripping force（kＮ）

Gripping force loss（kＮ）

80

Limit

5

NT15
100

50

Input force
5.3k
N
5kN
4.5kN
4kN
3.5kN
3kN
2.5kN
2kN

16.8

10

Mass moment of top jaw
m×r×2（㎏・㎜）

120

40

Standard soft top jaw
Gripping part center height H（㎜）
20

11.2

Limit

4kN

14.5
30

Mass moment of top jaw
m×r×2（㎏・㎜）

NL04

100

NT typeNT04 10.1

NT05

80

Gripping part center height H（㎜）Mass moment of top jaw
m×r×3（㎏・㎜）

Gripping force loss（kＮ）

Input force
Limit

82kN

273

Static gripping force（kＮ）

Gripping force loss（kＮ）

N-24

30

Mass moment of top jaw
m×r×3（㎏・㎜）

Input force
10kN
9kN
8kN
7kN
6kN
5kN
4kN

14.4

10

Limit

16
0

10

27
20

30

40

50

Standard soft top jaw
Gripping part center height H（㎜）

22

50

Gripping force loss（kＮ）

NL06

Static gripping force（kＮ）

Input force
26.1
25

-1

min -1
00
in
43
0m
0
-1
40
in
0m
350
-1
min
3000
-1
in
2500 m

20
15
10

-1

2000 min -1
1500 min -1
1000 min

5
0

20

40

Standard soft top jaw

60

80

19kN
17kN
15kN
13kN
11kN

9kN

7kN
10
35

100

120

0

10

Static gripping force（kＮ）

Gripping force loss（kＮ）

Gripping part center height H（㎜）

40
-1

30

min -1
00
36
in
-1
0m
330 00 min
0
3

20

2500

-1

min

-1

000 min2-11500 min-11000 min

10

0

40

80

120

160

Standard soft top jaw

200

240

50

Standard soft top jaw

Mass moment of top jaw
m×r×3（㎏・㎜）

NL08

Limit

21kN

39

60

30kN
27kN

50

24kN

Input force
Limit

21kN
18kN

15kN

12kN
9kN

10
24
280

Mass moment of top jaw
m×r×3（㎏・㎜）

42

10

0

70

50

Standard soft top jaw
Gripping part center height H（㎜）Input force

in

m

00

-1

n
-1
mi
in
00
0m
-1
28
250
in
-1
0m
220
in
-1
0m
200
min
1800

31

30
20
10

80

160

240

320

Gripping force loss（kＮ）

400

480

24kN

40

20kN
16kN

30

12kN

20

560

8kN

0

-1

00

in

m

0

22

-1

n

i
0m

-1

00

20

n
mi

-1

in
0m
-1
min
1500

170

-1

in
1200 m -1
1000 min

20

200

400

Standard soft top jaw

600

46

10

70

50

Standard soft top jaw
Mass moment of top jaw
Gripping part center height H（㎜）m×r×3（㎏・㎜）

Input force

800

1000

54kN

111

50kN

100

45kN

80

35kN

1200

Mass moment of top jaw
m×r×3（㎏・㎜）

Limit

40kN
30kN
60

25kN
20kN

40

15kN

20

-1

700 min -1
500 min

23

50

120

25

0

28kN

10

74.1

60

Limit

32kN

60

25

0

40

40kN
36kN

70

-1

1000 minStandard soft top jaw

NL12

-1

in
1500 mStatic gripping force（kＮ）

Gripping force loss（kＮ）

-1

40

81

80

Static gripping force（kＮ）

NL10

54
50

0

29
10

20

30

54
40

50

60

70

80

Standard soft top jaw
Gripping part center height H（㎜）

Input force

NL18

100

n

0

21

-1

i
0m

-1

in

0m

190

80
60
40

-1

0min
-1
170
min
1500
-1
in
1300m
-1
m
1100 in -1
900min20
01000Standard soft top jaw
500

1500

3000

5

0

40

30

50

60

30kN
50

20

10

00

-1

in
2000 m-1
1500 min-11000 min
20

40

60

80

100

Standard soft top jaw

120

140

160

30

18kN

Limit

30

12kN
10kN

20

8kN
6kN

10
42

10

50

-1

min -1
00
in
-1
0m
in
280
0m
-1
250
-1
min
2200 00 min-1in
201800 m-1
1500 min

31

10

-1

1000 min0

Input force

27kN

54

50

120

80

160

200

240

280

Limit

23kN

40

20kN

30

14kN

17kN
11kN

20

8kN

5kN

10

46

25
40

Standard soft top jaw

320 3600

1050

Static gripping force（kＮ）

Gripping force loss（kＮ）

Input force

80
49.5
-1

40

00

25
30
20

n
mi

-1

-1
min
00
in
0m
200
-1
-1
min
min
1700
1500

22

-1

in
1200 m-11000 min-1
in
m
700
-1
500 min

10
0

100

200

300

70

Standard soft top jaw
Mass moment of top jaw
Gripping part center height H（㎜）m×r×2（㎏・㎜）
90

NLT12

70

Standard soft top jaw
Gripping part center height H（㎜）
60

20

60

50

16kN
14kN

24

36
30

40

20kN

0

Static gripping force（kＮ）

Gripping force loss（kＮ）

20

10

40

180

Mass moment of top jaw
m×r×2（㎏・㎜）

NLT10

Limit

Input force

-1
n
mi
in
0m
-1
300
min
2500

10

0

100

Gripping part center height H（㎜）

-1

33

80

35
0

Static gripping force（kＮ）

Gripping force loss（kＮ）

00

60

Standard soft top jaw

-1

36

85
40

14kN
13kN
12kN
11kN
10kN
9kN
8kN
7kN
6kN
5kN

26

80

70

27

20

20

Input force

30

Mass moment of top jaw
m×r×2（㎏・㎜）

n
mi

20kN

NLT typeStandard soft top jaw

NLT08

50kN
40kN

Gripping part center height H（㎜）

-1
in
in
0m
430 4000 m
-1
in
m
0
-1
350
in
m
0
0
30
-1
00
25 min-1
2000 min-1
1500 min-11000 min

20

60kN

100

Standard soft top jaw

Mass moment of top jaw
m×r×3（㎏・㎜）

-1

10

70kN

0

Static gripping force（kＮ）

Gripping force loss（kＮ）

10

150

31

2500

17.4
15

80kN

700min-1
500min

2000

91kN

186

-1

Fig.14
NLT06

200

Static gripping force（kＮ）

Gripping force loss（kＮ）

124
120

Limit

400

500

600

700

36kN
33kN
30kN

74

70
60

27kN

50

24kN
21kN

40

18kN
15kN

30

12kN

9kN

20
10

800

Standard soft top jaw
Mass moment of top jaw
m×r×2（㎏・㎜）

Limit

29
0

10

20

30

54
40

50

60

70

Standard soft top jaw
Gripping part center height H（㎜）80

24

NOTICE
Analysis of the gripping force, input force and rotation speed using Fig. 11-14 is carried out as shown below.
-1・For example, in the case of N-04 standard soft jaw (mass moment 17kg・mm), it cannot exceed 6000min (rpm),
and the gripping force loss due to the centrifugal force at this rotation speed is 15.2kN (approx. 1550kgf). The
required static gripping force for the dynamic gripping force (gripping force loss by static gripping force centrifugal force) to become 1/3 of the static gripping force is 22.8kN, and the required input to obtain thisgripping force is 8.2kN. However, it is necessary to use at the gripping part center height H=14.5mm or less.
・If the gripping part center height H is high, it is necessary to lower the static gripping force.
・If the top jaw mass moment is large, the rotation speed needs to be lowered.
・If the rotation speed is high, the gripping force loss due to the centrifugal force becomes large. The centrifugal
force is proportional to the square of the rotation speed.

The required static gripping force and input force required at the rotation speed in use are predicted from Fig.11-14,
however, it contains a number of hypothetical conditions. Therefore, it is necessary to only use these as reference, andthe processing conditions must be determined after trial cutting without fail.

DANGER
・Reduce the allowable maximum input force of the 2 jaw chuck by 2/3 in comparison with the 3 jaw chuck. (Refer
to Table 4, 6) Otherwise the chuck will break, the work will fly out and this is dangerous.
・In the case of using only 1 jaw for gripping reduce the input force by 2/3 or more with 3 jaw chuck. If 2 jaws areused for gripping reduce the input force by 1/3 or more with 3 jaw chuck. If 1 jaw is used for gripping reduce theinput force by 1/2 or more with 2 jaw chuck. If it is used without lowering the input, the input which is normallyapplied evenly onto 3 of the jaws is concentrated onto 1 or 2 of the jaws. Otherwise the chuck will break, the work
will fly out and this is dangerous.

WARNING・In the case of inner diameter gripping, the input force needs to be lowered because the gripping force increase
due to the centrifugal force. Otherwise the work will deform or break due to large gripping force, work will fly out
and this is dangerous.

25

4 . Forming Soft Jaw
4−1 Attachment of soft jaw
The attaching position of the soft jaw can be adjusted by loosening the socket head cap screw, attaching the soft jaw
and by changing each serration engagement position.
Use the most appropriate soft jaw considering the shape, dimension, material, and surface roughness of the work andthe cutting conditions, etc.

DANGER
・Use the T nut so that it does not come out from the master jaw. (Refer to Fig.15)
・It if the T nut comes out from the master jaw, the master jaw and T nut will break causing the work to fly out and apossible precision failure.
Hard jaw
T nut

Soft jaw
T nut

Body

Body

Body

（Incorrect）

Fig.15

Body（Correct）

・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, the bolt will break, which isdangerous as the chuck or work will fly out.

Table 8Bolt size
M6
M8
M10

Tightening torque13 N・m33 N・m73 N・mBolt size
M12
M14
M16

Tightening torque
107 N・m
171 N・m
250 N・mBolt size
M20
M22
M24

Tightening torque402 N・m539 N・m
666 N・mDANGER

0〜1mm

Top jaw attaching bolt
・If the screw-in depth of the jaw attaching bolt to the T nut is shallow, the T nut will
break, and this is dangerous as the jaw and work will fly out. If the attaching bolt is
Top jaw
too long and comes out from the bottom of the T nut as well, this is dangerous as
the jaw and work will fly out since the top jaw is not fixed. Therefore, the overall
length of the jaw attaching bolt must be approximately 0 to -1mm from the bottomof the T nut (Refer to Fig.16).
・Use the T nut and the attaching bolts attached to the chuck and do not use bolts
other than these. If commercially available bolts are used for an unavoidable
reason, use bolts at the strength classification 12.9 (strength classification 10.9 forM22 or more) or more, and pay sufficient attention to the length.
T nut
Fig.16
・Do not rotate the chuck so that the T nut is loosened causing the jaw to fly out.
・Check that the reference mark on the side of the No. 1 master jaw is within the range of the entire stroke as shown in Fig. 17. Full
stroke the jaw at least once a day to check it before work or when supplying grease, etc. If it goes out of the range of appropriate
stroke due to loosening of the draw nut, etc., the work may not be gripped, and this is dangerous as the work will fly out.
・When gripping the work, use it by keeping the position of the master jaw within the
Reference
appropriate stroke range. Gripping in the center of the stroke is the most stable forthe mechanism, and the best precision can be obtained.
・When gripping near the stroke end, the work may not be gripped sometimes
according to the deviation, etc., of the gripping part allowance of the work, andEntire stroke
this is dangerous as the work will fly out.
Appropriate stroke・When gripping near the stroke end, the chuck may break and the chuck or work
Master jaw
Fig.17
could fly out.
1

Table 9
Type

N-04
NT04
N-05
NT05

N-06
N-08
N-10

Appropriate stroke range（mm）

1.6

2.3

N-12

NL04
NL06
NLT06

NL08
NLT08
N-15
NT15
N-18
N-21
N-24

NL10
NLT10

NL12
NLT12

NL18

3.0

4.0

5.0

5.6

6.0

10.0
26

4−2 Forming soft jaw with outside diameter gripping
１．Preparation of the plug for forming

φd・Prepare the plug for forming. The surface roughness of the plugoutside diameter is to be approximately 25s, and make a shapewith sufficient thickness which does not distort.
・It is convenient to prepare various outside diameter dimensions for
dimensions of forming parts.
・It is convenient to process tapping in the center part of the plugand to guide with a bolt, etc.

２．Process of the plug gripping part for forming

φD・Operate the switch valve and maximize the opening of the jaw.
・Then, process the φD part (part to grip the plug for forming). Set
the dimension φD so that gripping near the center of the jaw
maximum stroke (diameter) is possible.
・φD = φd + (jaw maximum stroke/2)

３．Gripping of the plug for forming

φD・By operating the switch valve, grip the plug for forming in the φD
part. At this time, grip by pressing the plug on the chuck front
surface in order for the plug not to be tilted. Repeat chucking
several times to stabilize the plug.

４．Forming

φD′・Process the gripping part (dimension φD') of the work in the statethat the plug is kept gripped. The φD' part is to be approximately
the same diameter (H7) as the diameter of the gripping part of thework, and process to be surface roughness at 6s or less.
・Set the hydraulic pressure during forming the same as during
processing of the work, or slightly higher.
・When the plug distorts, lower the hydraulic pressure or change theplug into a shape which does not easily distort.

５．Trial cutting
・Remove the plug for forming and grip the work to check the jaw
stroke.
・Implement trial cutting to check the process precision and that
there is no slip, etc.
・Contacting on the gripping surface is to be 2 points contact of theside A and the side B when gripping.

B

A

27

4−3 Forming soft jaw with inside diameter gripping
１．Preparation of the ring for forming

φd・Prepare the ring for forming. The surface roughness of the ringinside diameter is to be approximately 25s, and make a shapewith a sufficient thickness which does not distort.
・It is convenient to prepare various inside diameter dimensions for
dimensions of forming parts.

２．Process of the ring gripping part for forming

φD・Operate the switch valve and minimize the jaw to close.
・Then, process the φD part (part to grip the ring for forming). Set
the dimension φD so that gripping near the center of the jaw
maximum stroke (diameter) is possible.
・φD = φd - (jaw maximum stroke/2)

３．Gripping of the ring for forming

φD・By operating the switch valve, grip the ring for forming in the φD
part. At this time, grip by pressing the ring on the jaw in order forthe ring not to be tilted. Repeat chucking several times to stabilize
the ring.

４．Forming

φD′・Process the gripping part (dimension φD') of the work in the statethat the ring is kept gripped. The φD' part is to be approximately
the same diameter (H7) as the diameter of the gripping part of thework, and process to be surface roughness at 6s or less.
・Set the hydraulic pressure when forming the same as whenprocessing of the work, or slightly higher.
・When the ring distorts, lower the hydraulic pressure or change thering into a shape which does not easily distort.

５．Trial cutting
・Remove the ring for forming and grip the work to check the jaw
stroke.
・Implement trial cutting to check the process precision and that
there is no slip, etc.
・Contacting on the gripping surface is to be 2 points contact of theside A and the side B when gripping.
B

A

28

4−4 Forming method when you use forming jig
１．Preparation of the jig for forming

Ex.1
・Prepare the jig for forming. (There is a commercially available
product.)
・Attach the pin (Example 1) or the bolt and nut (Example 2) bydividing equally into 3 portions onto the ring shape plate. Make the Protrusion
ring into a shape with sufficient thickness which does not distort.

Pin

Ex.2

Plate

Bolt and nut

２．Gripping of the jig for forming・Operate the switch valve and maximize the opening of the jaw.
Then, operate the switch valve to insert the jig for forming into thebolt hole of the soft jaw to grip. At this time, grip by pressing thering end surface of the jig for forming onto the jaw so as not togenerate run-out.
・Check that it is gripping almost in the center of the appropriate
stroke.
・Set the hydraulic pressure when forming slightly higher than whenprocessing the work.

３．Forming

φD′・Process the gripping part (dimension φD') of the work in the statethat the jig for forming is kept gripped. The φD' part is to beapproximately the same diameter (H7) as the diameter of thegripping part of the work, and process to be surface roughness at
6s or less.

４．Trial cutting
・Remove the jig for forming and grip the work to check the jaw
stroke.
・Implement trial cutting to check the process precision and that
there is no slip, etc.
・Contacting on the gripping surface is to be 2 points contact of theside A and the side B when gripping.

B

A

29

5 . Usage
This product is a device to fix a work-piece when it is processed by the lathe machine or the rotary table.
The rotary cylinder closes the jaw and fixes a work-piece so that it does not move during processing. The chuck opens
the jaw after having processed it and remove a work-piece.

NOTICE・When replacing the top jaw, carefully clean the serration part with the master jaw, and the engagement part of
the T nut. Failure to do this may cause a precision failure.
・Set the hydraulic pressure according to the shape of the work and the cutting conditions. Pipe shape work, etc.,
may be distorted if they are tightened at a high gripping force.

5−1 Precautions during gripping work with chuck
DANGER・When gripping a work with the chuck, do not
get fingers or hands become caught. This
could cause crushed or cut fingers and hands.

5−2 Precautions during gripping work in irregular shape
DANGER・If a work in an irregular shape is gripped the master jaw may be broken. Consult our company or the distributor if
there is any concern.
・Cast metal, pitched shape or taper shape cannot be gripped.
・If the protrusion of the work is long, support it with a center or the steady rest. If the protrusion is long the tip of
the work turns, and this is dangerous as the work will fly out.

5−3 Precautions related to usage of jaw
DANGER・If a soft jaw other than one made by Kitagawa Corporation is used, the engagement will be inferior, and themaster jaw will be deformed, the gripping precision will worsen, and the work will fly out due to gripping failure,
which is dangerous.
・Do not use a top jaw with a different serration pitch from the master jaw. The engagement of the crests of theserration will become insufficient, therefore, the serration crests will break when gripping the work, and this isdangerous as the jaw and work will fly out.
・Do not use the soft jaw by welding to join for extension. The jaw will break due to insufficient strength and theserration part will become distorted due to welding. As a result, the engagement will worsen, the serration crests
will break, and this is dangerous as the work will fly out.

30

5−4 Precautions related to processing
DANGER<1> Unbalance
・In the case of processing largely unbalanced work, lower the rotation speed. The work will fly out and this isdangerous.
・Vibrations are generated if there is unbalance owing to the work or the jig, etc. Vibration not only will impart anegative influence on the process precision but also the endurance of the chuck being remarkably shortened,
and the chuck may break. Correct the unbalance using balance weights, etc., or lower the rotation speed for use.
・Heavy cutting at high rotation speed easily generates vibration in the same manner as chuck unbalance,
therefore, set cutting conditions appropriate for the dynamic gripping force and machine rigidity.

<2> Interference, contact, impact

・Before starting work, check that the top jaw, locator, work, etc., and the tool and the tool post, etc., do notinterfere at low rotation and then start processing.
・Do not allow anything to impact the chuck, jaw, and the work. The chuck will break and this is dangerous as thechuck and work will fly out.
・If the tool and the tool post contact the chuck or the work due to malfunction or tape mistake, etc., and impact isgiven, immediately stop the rotation, and check that there are no abnormalities in the top jaw, master jaw, T nut
and bolts of each part, etc.

<3> Coolant

・Unless coolant with a rust preventive effect is used, rust will occur inside the chuck and gripping force drop may
result. The work will fly out due to the gripping force drop and this is dangerous.

5−5 Attachment of locator and jig
・In the case of attaching the locator and the jig on the chuck body surface, tap or drill a hole in the additional process
range specified in Fig. 18.
Shaded part additional process possible range
A

A

30°

C

B

30°

B

N-06〜18:15°
N-21、26:30°
N-04,05
NL04

N-06〜26
NL06〜18
NLT06〜12

Fig.1831

NT04〜15

NLT06〜12

Table 10
Type
N-04, NL04, NT04
N-05, NT05
N-06, NL06, NLT06
N-08, NL08, NLT08
N-10, NL10, NLT10
N-12, NL12, NLT12
N-15, NT15
N-18, NL18
N-21
N-24

A (mm)
22
22
26
29
34
40
53
53
53
53

B (mm)
37
44
55
60
67
80
90
119
98
137

C (mm)
15 or less15 or less20 or less20 or less20 or less20 or less30 or less30 or less30 or less30 or lessA, B: Additional process impossible dimension. C: Processible depth of tapping or drilling a hole.

DANGER
・The chuck can be modified only in the manufacturer permissible range. This will not only break the chuck but thechuck and work may fly out, which is dangerous.
・Provide a countermeasure against flying out (dwell pin, etc.) due to centrifugal force to the locator or the jig, andattach with bolts which have sufficient strength. The locator or the jig may fly out, and this is dangerous.

32

6 ．Maintenance and Inspection
6−1 Periodic Inspection
・Add grease at least once a day.
・Fully stroke the jaw before starting work or upon supplying grease, and check that the jaw is inside the appropriate
stroke area. (Refer to page 26)
・Always clean the chuck body or the sliding surface using an air gun, etc., at the end of work.
・Check that the bolts of each part are not loosened at least once every 3 months.
・Disassemble and clean at least once every 6 months or every 100,000 strokes (once every 2 months or more forcutting cast metal).

6−2 Grease lubrication
１．Position to lubricate
・Lubricate using a grease gun from the grease nipple on the body periphery part or each master jaw periphery part.
Supply grease when the jaw is open. After lubrication, repeat opening and closing the jaw several times without
gripping work.

２．Grease to use
・Use the designated grease specified in Table 11. If grease other than the designated grease is used, sufficient effectmay not be obtained.

Table 11

Genuineproduct

CHUCK GREASE PRO

Conventional
product

Kitagawa chuck grease
Molykote EP Grease
Chuck EEZ grease
MOLYKOTE TP-42
Kluberpaste ME31-52

Kitagawa genuine product(Kitagawa distributor of each country)
Conventional product
TORAY Dow Corning (only inside Japan)
Kitagawa-Northtech Inc. (North American region)
Dow Corning (Europe, Asian region)
Kluber lubrication (worldwide)

３．Frequency of lubrication
・Add grease once every day.
・Add approximately 5g up to 8 inches and 10g for 10 inches or larger of grease to the each master jaw. Check thefilling degrees of the grease after removing the cover of the chuck center.
・In the case of high rotation or in the case of using a large amount of water soluble coolant, increase the frequency of
lubrication according to the usage conditions.

WARNING・To keep the chuck running in the best condition for a long time, adequate grease lubrication is necessary.
Insufficient grease lubrication causes a drop in the gripping force, operation failure at low hydraulic pressure,drop in gripping precision, abnormal wearing, seizing, etc. The work will fly out due to a drop in the gripping force
and this is dangerous.

４．Safety information about grease and anti-rust oil
Applicable range
・Designated grease・Antirust agent applied to the product at the delivery.

First aid measures
A f t e r i n h a l a t i o n: Remove victim to fresh air. If symptoms persist, call a physician.
After contact with skin: Wash off with mild cleaners and plenty of water. If symptoms persist, call a physician.
After contact with eyes: Rinse with plenty of water. If symptoms persist, call a physician.
A f t e r i n g e s t i o n: If large amounts are swallowed, do not induce vomiting. Obtain medical attention.
・ Please refer to each MSDS about the grease and the anti-rust oil which you prepared.
33

6−3 Disassembling
Disassembling procedures
Read the following disassembling procedures with reference to page 5.
1. Turn off the main power of the machine before starting work.
2. Loosen the jaw attaching bolt [15] and remove the soft jaw [4] and the T nut [5].
3. Loosen the socket head cap screw (or machine screw) [14] and remove the cover [6].
4. Remove the stop bolt [12].
5. Loosen the set screw [16] and remove lead ball [11] (Save these parts carefully because they are small.). Loosen thedraw tube [8] and remove it from the wedge plunger [2]. (4 and 5 : The draw tube is not provided.)
6. Remove the wedge plunger [2] to the body [1] rear side.
7. Remove the master jaw [3] to the outer periphery side of the chuck.
8. The draw screw [7] is assembled in the draw tube [8] to adjust the plunger position. Usually the draw screw may notdisassemble. Read the following procedures if it is disassembled.
Loosen the set screw [17] on the draw nut [9], and remove the draw nut [9] from the draw screw [7]. Save the steel
ball [19] and the spring [10] carefully.

Assembling procedures
Read the following assembling procedures with reference to page 5.
Assemble again while sufficiently coating the recommended grease in the reverse procedures of disassembling. At thistime, pay sufficient attention so as not to make a mistake in the numbers of the body [1], master jaw [3], and the wedge
plunger [2].
Read the following procedures when you assemble draw screw. (Refer to Fig.19)
1. Install the draw screw [7] to draw tube [8] (4 and 5 : Plunger [2]).
2. Put the spring [10] and the steel ball [19] in a hole of the draw tube [8] (4 and 5 : draw nut [9]).
3. Install the draw nut [9] to the draw screw [7].
4. Slightly loosen the draw nut [9] from the tightened situation and adjust the clearance between the draw nut and draw
tube [8] (4 and 5 : plunger [2]). Proper clearance: 0.05〜0.15.
5. Screw the set screw [17]. Sufficiently screw the set screw onto the draw screw [7] at the recommended torque of 1.3〜1.4 times.
6. Stake the set screw to prevent loosing.

Staking

0.05〜0.15（Clearance）
Draw tube（4 or 5 ：Plunger)

Set screw

Draw screw
Click stop

Fig.1934

CAUTION
・Use an eyebolt or a hanging belt when attaching and detaching the chuck to and from the machine, as there is adanger of injury or damage if the chuck drops.
Chuck size(inch)
Eyebolt
4〜5
none
6〜10
M10
12〜15
M12
18〜24
M16

WARNING・Remove the eyebolt or the belt without fail after using. If the chuck is rotated with the eyebolt, etc., attached, they
may fly out and this is dangerous.
・Disassemble and clean the chuck at least once every 6 months or every 100,000 strokes (once every 2 months
or more for cutting cast metal). If cutting powder or other substances stagnate inside the chuck, it will lead toinsufficient stroke and a drop in the gripping force, and this is dangerous as the work will fly out. Check each part
carefully and replace any part that is worn or cracked.
・After inspection, apply sufficient grease in the designated areas and reassemble.
・After assembling, measure the gripping force according to the method on page 16, and check that the specified
gripping force is obtained.
・If you stop the machine for a long period of time, remove the work from the machine. If you don't, the work candrop due to a drop in the hydraulic pressure or the cylinder can stop or malfunction.
・ If you stop the machine or store the chuck for a long period of time, add grease to prevent rust.

35

7 . Malfunction and Countermeasures
7−1 In the case of malfunction
Check the points specified in the table below and take the appropriate countermeasure.

Table 12
Defective
The chuckdoes notoperate.
Insufficient

Cause

Countermeasure

The chuck inside will break.

Disassemble and replace the broken part.
Disassemble, correct the seized part with oilstone, etc., or replace

The sliding surface is seized.

the part.
Check the piping and the electric system, and if there is no

The cylinder is not operating.

abnormality, disassemble and clean the cylinder.

A large amount of cutting powder is inside.

stroke of the jaw. The draw bar loosened.

Remove the draw bar and retighten it again.

The stroke of the jaw is insufficient.
The gripping force is insufficient.
The forming diameter of the top jaw is notconsistent with the work diameter.
The Workslips.

Disassemble and clean.
Adjust so that the jaw is near the center of the stroke whengripping the work.
Check that the correct hydraulic pressure is obtained.
Form again based on the correct forming method.
Calculate the cutting force and check that it is suitable for the

The cutting force is too large.

specification of the chuck.
Supply grease from the grease nipple, and open and close the jaw

Insufficient grease lubrication

several times without gripping a work.

The rotation speed is too high. Swinging occurs

Lower the rotation speed to a speed at which the required gripping

due to incorrect alignment of cores of workforce can be obtained. Align the cores sufficiently to eliminate

feeder, steady rest, tail stock, etc.

such swinging.

The outer periphery of the chuck is running out.
Dust is attached on the serration part of themaster jaw and the top jaw.

Check the end surface run-out and the outer periphery, andretighten the chuck attachingbolts.

Remove the top jaw, and clean the serration part thoroughly.

The attaching bolt of the top jaw is not tightened

Tighten the top jaw attaching bolt at the specified torque.

sufficiently.

(Refer to page 26)

Precision

The forming method of the soft jaw is

Is the plug for forming parallel to the chuck end surface? Is thefailure.

inappropriate.

plug for forming not deformed due to the gripping force?

The height of the top jaw is too high, the top jaw

Lower the height of the top jaw. (Replace it with the standard size)

is deformed, the top jaw

or check the gripping contact surface and make it uniform.

attaching bolt iselongated.
The gripping force is too large
work being

deformed.

leading to theLower the gripping force in the range possible to process toprevent deformation.

WARNING・If the chuck failed due to a seizure or breakage, remove the chuck from the machine, following the disassembly steps in page
34. When the jaws and covers cannot be removed due to a blockage of workpiece, do not disassemble forcibly but pleasecontact us or our agent.
・If these countermeasures do not correct the problem or improve the situation. Immediately stop using the machine.
Continuous use of a broken product or a defective product may cause a serious accident by the chuck or the work flying out.
・Only experienced and trained personnel should do repairs and fix malfunctions. Repair of a malfunction by a person who has
never received instruction from an experienced person, the distributor or our company may cause a serious accident.

7−2 Where to contact in the case of malfunction
In the case of malfunction, contact the distributor where you purchased the product or our branch office listed on the back cover.
36

For Machine Tool Manufactures
Following pages are described for machine tool manufacturers (personnel who attach a chuck to a machine). Please
read following instruction carefully when you attach or detach a chuck to machine, and please sufficiently understandand follow the instructions for safe operation.

8 . Attachment
8−1 Outline drawing of attachment
Cylinder adapter
Draw bar
CylinderTop jaw
Chuck

NC latheSupportDrain hose

Pressureadjusting screw

Pump

Pressuregauge

Flexible hose
Use one with large inside
diameter as possible

Manualswitching valve

Line filter

SOL.
Solenoid
valve

Tank

Return onto the oil surface

Fig.20・Attach the manual switching valve at a position where it is easy to operate for the attaching equipment.
・Install the hydraulic unit at a position where the drain hose is not kinked and the needle of the pressure gauge iseasily read.

37

DANGER・When other actuators are operated by the same hydraulic pressure source as the cylinder for chuck, be sure thata pressure drop of the cylinder does not occur during use. A hydraulic pressure drop leads to a drop in thegripping force which could allow the work to fly out.
・ As to the drain hose・ Use a transparent vinyl hose for visualization.
・ Provide a stream slope, without air pocket. This will ensure no back pressure.
・ The end of the hose is physically above the oil level. (Refer to Fig.20)
・ If the hydraulic oil stagnates inside the cylinder, oil leakage occurs, which may cause a fire.

WARNING・Install after removing the dust inside the pipe completely.
・Add a filter to the pressure supply line. If foreign matters gets inside the cylinder, this is dangerous since therotation valve of the cylinder will seize, the hose will tear off, and the cylinder will rotate. This is also dangerous
as the work will fly out.
・Always use a flexible hose for the hydraulic piping to the cylinder, and the bending force or tensile force of thepipe must not be applied to the cylinder. Use a pipe inside diameter as large as possible and keep the piping
length as short as possible.

NOTICE
・Especially, when a large sized hydraulic unit is used, excessive surge pressure is generated and the gripping
force becomes large, therefore, it may result in breakage of the chuck or the lowering of endurance. Restrain thesurge pressure by adopting a throttle valve, etc.

8−2 In the case that the back plate must be manufactured
１．Production of draw bar
Determine the length of the draw bar as shown below.

Cylinder Cylinder adapter Chuck
Draw barφD

Width across flat
C

B

E

L

Fig.21
Hydraulic cylinder
Y0715R
Y0715R
Y1020RY1225RY1225R
Y1530R
Y1530R
Y1530R
Y2035R
Y2035R
Y2035R
Y2050R
Y2035R
Y2035R

B
30
30
30
35
35
43
43
43
55
55
55
55
55
55

C
M20
M20
M20
M24
M24
M30
M30
M30
M36
M36
M36
M36
M36
M36

Clearance

Fig.22

Table 13-1
Type
N-04,NT04,NL04
N-05,NT05
N-06,NL06,NLT06
N-08,NL08,NLT08
N-10
NL10,NLT10
N-12,NLT12
NL12
N-15
NT15
N-18
NL18
N-21
N-24

5

L
A(4",5")A(6"〜24")F

D (min)
30
30
30
35
35
45
45
45
55
55
55
55
55
55

E
M10
M12
M16
M20
M20
M20
M20
M24
M30
M30
M30
M30
M30
M30

F
25
35
35
35
35
35
35
45
60
60
60
60
60
60

L
A-54
A-45
A-131.5
A-162
A-189
A-194
A-194
A-78
A-143
A-143
A-131
A-131
A-136
A-136
38

Table 13-2
Type
N-04,NT04,NL04
N-05,NT05
N-06,NL06,NLT06
N-08,NL08,NLT08
N-10

Air cylinder
AY1315R
AY1315R
AY1720R
AY2225R
AY2225R

B
20
20
25
30
30

C
M12
M12
M16
M20
M20

D (min)
20
20
25
30
30

E
M10
M12
M16
M20
M20

F
25
35
35
35
35

L
A-43
A-34
A-151.5
A-182
A-209

The dimension L in Fig.21 is determined from the distance A between the cylinder adapter and the back plate.
(Example) In the combination of N-06, Y1020RE, and when A=800mm, the draw bar length L is to be
L = A − 131.5 = 800 − 131.5 = 668.5mm.
At the time of the screw process of the dimension C, the precision is to be JIS 6H and 6h, 6g matching the screw of thepiston of the cylinder. Pay attention so that the thread parts on both ends and the inner periphery do not swing or
become unbalanced.

DANGER
・Provide sufficient strength for the draw bar. If the draw bar is broken due to insufficiency of the strength, thegripping force will be lost instantly, which is dangerous as the work will fly out.
2・Keep the dimension D in Fig. 21 for the draw bar and a material with the tensile strength 380MPa (38kgf/mm )or more must be used.
・The personnel who designed draw bar must judge whether the strength of the draw bar is sufficient for theusage conditions.
・The dimensions and materials specified in this manual do not guarantee that the draw bar will not break under
every usage condition.
・If the screw-in depth of the draw bar to the draw screw is insufficient, the screw will break and the gripping force
will be lost instantly, which is dangerous as the work will fly out.
・If the engagement of the screw of the draw bar is loose, vibration may occur resulting in breakage of the screw. If
the screw breaks, the gripping force will be lost instantly, which is dangerous as the work will fly out.
・If the draw bar is unbalanced, vibration occurs, the screw is broken and the gripping force will be lost instantly,
which is dangerous as the work will fly out.

２．Production of back plate

NOTICE・Process the engagement diameter of the back plate after measuring the actual spindle.
・Run-out of the back plate directly affects the process precision. The end surface run-out of the back plate, spigot
joint diameter run-out must be 0.005 mm or less.
・ The precision of the processing of the chuck attachment end surface of the back plate and the spigot joint
diameter can be raised by processing them after mounting to the installed machine.
・Process the chuck attachment spigot joint diameter of the back plate at the target value A-0.01 in the dimension
A of Table 14.
・Fig.23 shows the case of the JIS short taper standard.
D

C

Chuck

φB
φA

Back plate

Draw bar
Attaching bolt
0.005TIR

39

0.005TIR

Fig.23

Table14
N-04
NT04
NL04
60
80
46
―

Type
φA (H6)φBC
D (min)

N-06
NL06
NLT06
140
104.8
69
15

N-05
NL05
80
100
48
―

N-08
NL08
NLT08
170
133.4
80
17

N-10
NL10
NLT10
220
171.4
84
18

N-12
NL12
NLT12
220
171.4
100
18

N-15

N-18

N-21

N-24

300
235.0
108
22

300
235.0
108
22

380
235.0
119
27

380
235.0
119
27

Dimension A (spigot joint diameter) conforms to the DIN standard.

DANGER・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, the bolt will break, whichis dangerous as the chuck or work will fly out.
・Use the bolts attached to the chuck, and do not use other bolts. However, if you must use other bolts notprovided by Kitagawa, use bolts that have at least a strength classification of 12.9 (10.9 for M22 or more) and be
sure they are long enough.

Table 15
Bolt size
M6
M8
M10
M12
M14

Tightening torque13 N・m33 N・m73 N・m
107 N・m
171 N・mBolt size
M16
M20
M22
M24

Tightening torque
250 N・m402 N・m539 N・m
666 N・m

8−3 In the case of with back plate
Also readIn the case that the back plate must be manufactured

in 8-2 (pages 38-40).

１．Dimensions of power chuck
Table 16

φD

Type

L
G

A

Fig.24φD

L

G

N-06A05
NL06A05
NLT06A5
N-08A06
NL08A06
NLT08A6
N-10A06
NL10A06
NLT10A6
N-10A08
NL10A08
NLT10A8
N-12A06
NL12A06
NLT12A6
N-12A08
NL12A08
NLT12A8
N-15A08
N-15A11
N-18A08
N-18A11
N-21A08
N-21A11
N-21A15
N-24A11
N-24A15

A

D

6-L

84

104.8

M10×8597

133.4

M12×100

104

133.4

M12×30102

171.4

M16×110

120

133.4

M12×30118

171.4

M16×125

130

171.4
235.0
171.4
235.0
171.4
235.0
330.2
235.0
330.2

M16×45
M20×140
M16×45
M20×140
M16×50
M20×55
M22×150
M20×55
M22×150

G

Fig

MAX.

MIN.

86.5

66.5

24

89

24

89

25

115

24

110
114
114
117
140

130
146
146

143
119
27
119
145
29
145

89
-3
89
115
-1
115

82

47

70

35

70

35

70

35

25
24
25
24
25
24
25
25
24
25
25

A

Fig.2540

２．Production of draw bar

CylinderCylinder adapter

Chuck

φD

Width across flat
C

E
Draw bar

F
B

L

L

5mm
ClearanceA

Fig.26

Fig.27
Table 17-1

Type
N-06A05
NL06A05
NLT06A5
N-08A05
NL08A05
NLT08A5
N-10A06
NL10A06
NLT10A6
N-10A08
NL10A08
NLT10A8
N-12A06
NLT12A6

Hydraulic cylinder

BC

D (min)E

F

L

Y1020R

30

M20

30

M16

35

A-116.5

Y1225R

35

M24

35

M20

35

A-145

Y1225R

35

M24

35

M20

35

A-145

Y1530R

43

M30

45

M20

35

A-145

Y1225R

35

M24

35

M20

35

A-171

Y1530R

43

M30

45

M20

35

A-171

Y1530R

43

M30

45

M20

35

A-150

Type
NL12A06
N-12A08
NLT12A8NL12A08
N-15A08
N-15A11
N-18A08
N-18A11
N-21A08
N-21A11
N-21A15
N-24A11
N-24A15

Hydraulic cylinder
Y1530R

B
43

C
M30

D (min)
45

E
M24

F
45

L
A-58

Y1530R

43

M30

45

M20

35

A-176

Y1530R

43

M30

45

M24

35

A-60

Y2035R

55

M36

55

M30

60

A-121

Y2035R

55

M36

55

M30

60

A-109

Y2035R

55

M36

55

M30

60

A-109

Y2035R

55

M36

55

M30

60

A-109

Table 17-2

The dimension L in Fig.26 is determined from the distance A between the cylinder adapter and the back plate.
(Example) In the combination of N-06A05, Y1020RE, and when A=800mm, the draw bar length
L is to be L = A −116.5 = 800 − 116.5 = 683.5mm.
At the time of the screw process of the dimension a, the precision is to be JIS 6H and 6h, 6g matching the screw of thepiston of the cylinder. Pay attention so that the thread parts on both ends and the inner periphery do not swing or
become unbalanced.

8−4 Attachment of chuck
１．Connect the draw tube to plunger
・The draw tube is packed as a separate unit because of packing reason. Install the draw tube to the plunger with aspanner. Then install the lead ball and the set screw., so that it may not be loosened. (Refer to Fig.28)

41

Hex key
Set screw
Lead ballWedge plunger
Draw tube

Fig.28
２．Attaching the draw bar to the cylinder
・Apply adhesive onto the screw part of the draw bar, and screw it into the piston rod of cylinder. At this time, refer tothe instruction manual for the cylinder for tightening torque.

NOTICE・When attaching the draw bar to the cylinder, the stopper pin of the piston may break if tightened at the stroke
middle position of the piston. In the case of a Y type cylinder, screw it in so that the piston rod is fully in. Follow
the explanation of the instruction manual for the cylinder for other items about the cylinder.
・Use the cylinder that matched the stroke of the chuck. The cover is damaged if you use the cylinder that have
longer stroke than the chuck, because the jaws move for a long distance.

３．Attach the cylinder to the spindle (or the cylinder adapter)・Check the run-out of the cylinder, and if it is normal, attach the hydraulic pipe.
2・Move 2 to 3 times at low pressure (0.4 MPa-0.5 MPa, 4 - 5 kgf/cm ) and set the piston at the forward end and turn off
the power supply.

CAUTION・Use an eyebolt or a hanging belt
when attaching and detaching thechuck to and from the machine,as there is a danger of injury or
damage if the chuck drops.

Chuck size(inch)
4〜5
6〜10
12〜15
18〜24

Eyebolt
none
M10
M12
M16

WARNING・Remove the eyebolt or the belt without fail after using. If the chuck is rotated with the eyebolt, etc., attached, they
may fly out and this is dangerous.

4．Connect the chuck to the draw bar
・Remove the soft jaw and the cover of the chuck, and insert the handle or the hex key to the chuck center hole,
to connect to the draw bar while turning the draw screw.
・When connecting the draw screw and the draw bar, do not forcibly screw them in if they cannot be screwed smoothly,
but check the inclination of the core of the screw, etc.

42

DANGER・If the screw-in depth of the draw bar to the draw screw is insufficient, the screw will break and the gripping force
will be lost instantly, which will the work to fly out.
・If the engagement of the screw of the draw bar is loose, vibration may occur resulting in breakage of the screw,loss of gripping force and the work flying out.

５．Attach the chuck matching to the attaching surface of the spindle (or the back plate).
・Turn the handle for connection to make a state that the chuck closely contacts the spindle attaching surface of the lathe.
・In the case of adjusting the centering of the chuck, lightly hit the body side face with a plastic hammer.
・Tighten the chuck attaching bolts evenly. At this time, tighten the bolts at the specified torque.

DANGER・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, the bolt will break, whichis dangerous as the chuck or work will fly out.
・Use the bolts attached to the chuck, and do not use other bolts. However, if you must use other bolts notprovided by Kitagawa, use bolts that have at least a strength classification of 12.9 (10.9 for M22 or more) and be
sure they are long enough.

Table 18
Tightening torque13 N・m33 N・m73 N・m
107 N・m
171 N・mBolt size
M6
M8
M10
M12
M14

Tightening torque
250 N・m402 N・m539 N・m
666 N・mBolt size
M16
M20
M22
M24

６．Adjust the position of the wedge plunger
・The appropriate position of the wedge plunger at the cylinder forward end is the position when the dimension A in Fig.29 becomesas shown in the table below.
・At this time, check that the reference mark of the master jaw meets the line of the outside of the stroke mark. (Refer to page 26).
・A click stop (rotation stopper) is also attached to the draw nut, so complete adjustment at the position where this
response is felt.
Hex key : for 4", 5" and NL12
Back plate
Draw bar

Cover

Fig.29A
HandleSpindleChuck attaching bolt

Table 19Type
N-04,NT04
N-05,NT05
N-06
N-08
N-10
N-12
N-15
NT15
N-18

A
0
0
0
0
0
0
-1
-1
-1

Type
NL18
N-21
N-24
NL04
―
NL06,NLT06
NL08,NLT08
NL10,NLT10
NL12,NLT12

A
-1
-1
-1
0
―
4
4
4
5

７．Attach the cover and check the run-out of the chuck・Keep the periphery run-out and the end surface run-out of the chuck at 0.02mm T.I.R or less.
・Full stroke the jaw and check that the reference mark of the master jaw is completely within the entire stroke area
(Refer to page 26).
43

9 . Other information
9−1 About standards and orders
This product is based on the following standards or orders.
・ Machinery directive : 2006/42/EC Annex I
・ EN ISO 12100 : 2010
・ EN1550 : 1997+A1 : 2008

9−2 Information about markings of product3

Manufacturer's logo
Type oftop jaws

3
Ｆ Ｎ

1

MFG. NO.

F
Σ MA
ΣS Ｎ S MA X ＊＊X ＊MMA AX ＊ ＊＊ ＊ kN
SS ＊＊ kN＊＊ ＊/m＊＊ in
Kg

SB08B1

3

Type

WA
GA
A
KIT YPET AN
PJASpecifications

Manufacturer's
address
S
T
7 AN
D
7
HI 1 MO ARDROCSH TOM HUCIMA
A 7 CH K
I2
6-8 FUC
61
0 J HU-SAP HI
ANF MAX：MAX PERMISSIBLE INPUT FORCEΣS MAX：MAX STATIC GRIPPING FORCEN MAX：MAX PERMISSIBLE SPEED
MASS：MASSJaw No.

MFG No.
Jaw No.
Stroke mark2

Fig.309−3 About disposal
Ultimate disposal of this product should be handled according to all national laws and regulations.

44

https://www.kiw.co.jp
https://www.kitagawa.com
https://www.kitagawa.com.cn

Kitagawa Corporation

Kitagawa Global hand Company

77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan

Tel.＋81-847-40-0561

Fax.＋81-847-45-8911■ JAPAN DOMESTICTokyo office1-405-1,Kita-ku,Yosino-cho,Saitama-shi,Saitama,331-9634,Japan
Tel.＋81-48-667-3469
Fax.＋81-48-663-4678

Sendai office

4-15-13,Yamatomachi,Wakabayashi-ku,Sendai-shi,Miyagi,984-0042,Japan
Tel.＋81-22-232-6732
Fax.＋81-22-232-6739

Nagoya office

2-62,Kamitakabata,Nakagawa-ku,Nagoya-shi,Aichi,454-0873,Japan
Tel.＋81-52-363-0371
Fax.＋81-52-362-0690

Osaka office

3-2-9,Kitakagaya,Suminoe-ku,Osaka-shi,Osaka,559-0011,Japan
Tel.＋81-6-6685-9065
Fax.＋81-6-6684-2025

Hiroshima office77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Tel.＋81-847-40-0541
Fax.＋81-847-46-1721

Kyushu office

7-6-39,Itazuke,Hakata-ku,Fukuoka-shi,Fukuoka,812-0888,Japan
Tel.＋81-92-501-2102
Fax.＋81-92-501-2103

Overseas office77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Tel.＋81-847-40-0526
Fax.＋81-847-45-8911■ OVERSEASKITAGAWA-NORTHTECH INC.

https://www.kitagawa-usa.com

America Contact
Tel.＋1 847-310-8787

Fax.＋1 847-310-9484

KITAGAWA EUROPE LTD.
Tel.＋44 1725-514000

https://www.kitagawa.global/en

Fax.＋44 1725-514001

KITAGAWA EUROPE GmbHhttps://www.kitagawa.global/de

Tel.＋49 2102-123-78-00 Fax.＋49 2102-123-78-69

KITAGAWA EUROPE GmbH Poland Office
Europe Contact

https://www.kitagawa.global/pl

Tel.＋48 607-39-8855

KITAGAWA EUROPE GmbH Czech Officehttps://www.kitagawa.global/cz

Tel.＋420 603-856-122

KITAGAWA EUROPE GmbH Romania Officehttps://www.kitagawa.global/roTel.＋40 727-770-329

KITAGAWA EUROPE GmbH Hungary Officehttps://www.kitagawa.global/hu

Tel.＋36 30-510-3550

KITAGAWA INDIA PVT LTD.
Tel.＋91-80-2976-5200

https://www.kitagawa.global/in

Fax.＋91-80-2976-5205

KITAGAWA (THAILAND) CO., LTD. Bangkok BranchTel.＋66 2-712-7479

Fax.＋66 2-712-7481

Kitagawa Corporation (Shanghai)
Asia Contact

Tel.＋86 21-6295-5772

https://www.kitagawa.com.cn

Fax.＋86 21-6295-5792

Kitagawa Corporation (Shanghai) Guangzhou OfficeTel.＋86 20-2885-5276

DEAMARK LIMITED
Tel.＋886 2-2393-1221

http://www.deamark.com.tw
Fax.＋886 2-2395-1231

KITAGAWA KOREA AGENT CO., LTD.
Tel.＋82 2-2026-2222

http://www.kitagawa.co.kr

Fax.＋82 2-2026-2113

DIMAC TOOLING PTY. LTD.

https://www.dimac.com.au

Oceania Contact
Tel.＋61 3-9561-6155

Fax.＋61 3-9561-6705

The products herein are controlled under Japanese Foreign Exchange and Foreign Trade Control Act. In the event of importing and/or exporting the products,
you are obliged to consult KITAGAWA as well as your government for the related regulation prior to any transaction.

J 2021.12.2000