expansion S clamp
double acting
7MPa

Doubleactingmodel

CGS

In n o va tive w o rk p i e c e c l am p i ng t o o lw w w. p a s c a l e n g . c o . j p

Page 3

The revolution of machining starts

Cylinder Block & Head, Transmission casePasca
al expansion clamps are used in
i n variety of
Pascal1

with the Pascal expansion clamp& housing, knuckle, carrier, ABS, and Valve body…
automobile parts machining processes all over the world.

2

CGS- N2□□□

Expansion clamp

Doubleacting7MPa

Maximize performance by minimizing tool length.

The expansion clamp holds firmly to the clamping hole at the bottom of workpiece and clamps it firmly down to theseating surface by utilizing taper rod and tapered surface of gripper. Clamping force is transmitted directly to seating
surface and holds workpiece in place firmly without any distortion or deflection, making high grade and stablemachining possible.

Workpiece
Taper rod
Gripper

Seating surface

3

TaperedsurfaceCGS- N2□□□

7MPa

Expansion clamp

DoubleactingExpansion clamp
model

CGS

Double acting

7MPa

Innovative workpiece clamping tool

Superior tool accessibility

Short tool

Dramatically improved flatness & roughness

Non-distorted clamping at bottom of workpiece

Bore depth
20 mm(CGS-N22)

expansion clamp model CGS

Compact & simple jig ﬁxture

Short loading stroke① Clamping at the bottom of the workpiece makes theshortest tool machining possible and helps to improve
the grade and efficiency in machining process.
② Clamping at the bottom of workpiece dramatically
improves flatness/roughness.

Thinner jig plate⑤ Simple fixture assists in eliminating metal chip pile-up.
⑥ Shallow bore makes thin fixture plate possible.
⑦ Compact, lightweight fixture makes high-speed
cutting process possible.

③ Jig costs are reduced thanks to a simple andcompact jig structure.

⑧ Low-profile gripper design allows minimizationof lift stroke of workpiece transfer unit, making it
possible to improve loader system.

④ Compact fixture takes minimum space andminimizes length of machine line.

⑨ Clamping at the bottom of the workpiece is an
ideal method for 5-plane machining.

Superior tool accessibility

Interference caused by a work clamp
will require a longer tool length
Swing clamp

expansion clamp
model CGS

4

CGS- N2□□□

7MPa

Expansion clamp

DoubleactingWorkpiece setting① Pistons Ⓐ & Ⓑ, as well as taper rod and gripper are raised by unclamping hydraulics.
② Set the workpiece onto the seating surface. In order detect if actual unclamping has occurred using the
air sensor, allow air needed to confirm seating to flow by using cylinder (or similar) to lift work up during
unclamping.
Clamping hole
Scraper
Seating detection air outlet

Taper rod
Gripper
Seating surface

LifterPistonⒶ

PistonⒷ

Clamping hydraulics

Unclamping hydraulics

Seating detection air

Workpiece holding① Release unclamping hydraulics and apply clamping hydraulic pressure. Piston Ⓐ will remain in upright positionas piston Ⓑ and taper rod are lowered.
② As piston Ⓐ remains in upright position, the gripper is expanded horizontally along the tapered surface of thetaper rod to grip clamping holes.
③ The gripper securely grips the internal face of the clamping holes and pulls the workpiece down firmly onto theseating surface.
④ Workpiece holding is completed by the seating detection air sensor, clamping and unclamping hydraulicpressure.
Clamping hole

Tapered surface

Taper rod
Gripper
Seating surface

Seating detection air outlet

PistonⒶ

Incomplete clamping
detection valve

PistonⒷ

Centering function
Clamping hydraulics

5

O-ringUnclamping hydraulics

Seating detection air

CGS- N2□□□

Expansion clamp

7MPa

DoubleactingLarge gripper expansion stroke
The gripper expands horizontally by 1.0mm, which enables the accommodation of dimensional variations in
diecast bore diameters and ensures workpiece is held securely.

Grip inner diameterø10

Taper rod diameter

Min. grip inner diameterMax. grip inner diameter

Draft angle of grip inner diameter

ø9.55

ø9.7

ø10.7

max. 3°each side

(Example：model CGS-N22E10)

Taper rod and gripper with superior durability① The gripping force of expansion clamp is transmitted from tapered surface to gripper, making it possible forthe gripper to hold onto inner diameter of workpiece and hold the workpiece on the seating surface for secure
workpiece clamping.
② Special steel with superior abrasion resistance is used for gripper to improve durability.
③ Tip section of taper rod has larger diameter than gripper and is well chamfered to be a better guide whensetting the workpiece.

① Tapered surface
Clamping hole

③ Taper rod tip section② Gripper

Gripper6

CGS- N2□□□

7MPa

Expansion clamp

DoubleactingDetects deformation of workpiece and floating of workpiece resulting in faulty setting
When workpiece has significant deformation or when it is set poorly with space of 1.2 mm above seating surface(Figure 1-a) or when metal chips are caught by clamp (Figure 1-b), the workpiece is not held on seating surface
and air sensor is unable to detect seating and this confirms incomplete clamping.

Faulty setting of workpiece

Seating surface

Workpiece set ﬂoating 1.2 mm
or more above seating surface

F i g u r e 3 -a

Metal chips caught
by clamp

Figure 3-b

Floating of workpiece

Incomplete clamping
detection
Seating detection air ﬂow :Sensor is not triggered

Clamping hydraulics

7

Unclamping hydraulics

Seating detection air

CGS- N2□□□

7MPa

Expansion clamp

Detects incomplete gripping

Doubleacting

PAT. JP4297511

When gripper fails to grip properly due to large draft angle of grip inner diameter, piston Ⓐ continues to stroke
down until incomplete clamping detection valve Ⓒ is triggered. Since seating detection air is released, air sensor
is unable to detect seating of workpiece and this confirms incomplete clamping.

Large draft angle of grip inner diameter

Slipping of gripper

Clamping hole

Taper rod
Gripper

Piston Ⓐ

Incomplete clamping
detection valve Ⓒ

Seating detection air

Piston Ⓐ

Incomplete clamping
detection valve Ⓒ

Incomplete clamping detection

Piston Ⓐ
Seating detection air

Seating detection air

Incomplete clamping
detection valve Ⓒ

Normal clamping

Since piston Ⓐ continues to stroke

Piston Ⓐ stops in the middle of stroke

down until incomplete clamping

and incomplete clamping detection

detection valve Ⓒ is triggered,valve Ⓒ is not triggered.

seating detection air continues to
ﬂow and sensor is not triggered.

8

CGS- N2□□□

Expansion clamp

7MPa

DoubleactingIncorporating strong air blowing circuit① Air blown from a space between the gripper and scraper clears off metal chips and coolant that stay on theseating surface.
② Flushing channel is also provided on the seating surface to remove the metal chips and coolants smoothly
during workpiece setting.

Gripper② FlushingchannelScraper

Scraper

Seatingsurface

Air blow

Seating surface can be reground（max.0.1 mm）① When seating surface is damaged, the flange section can be dismounted and reground.
② Flange can be easily dismounted and reassembled at production site.

① Seating surface② Flange9

CGS- N2□□□

Expansion clamp

7MPa

DoubleactingClamping hole pitch errors can be tolerated

Taper rod and gripper slide radially and tolerate
pitch errors (±1mm).
Taper rod and gripper are pushed back towards
the center by O-ring when unclamping.

Allowable eccentricity ±0.5 mm

Allowable eccentricity ±0.5 mm

Taper rod

Clamping hole

GripperO-ringSliding10

CGS- N2□□□

7MPa

Expansion clamp

DoubleactingWith the development of the non-constant air blow expansion clamp, air consumption will be significantly decreased.
The traditional model ordinarily requires 50ℓ /min（0.3MPa）flow rate（ when grip inner diameter is ø12）. The new model

Refer to page

3 Gripø11 ~ ø20

13 to 18

Non-constant air blow model

Grip inner diameter

Clamping force（hydraulic pressure 7 MPa）

Model

ø 11 12 13 14 15 16

3.6 kNCGS-N22E Grip inner diameter 1

ø 12 13 14 15 16

7.5 kNCGS-N23E Grip inner diameterø 17 18 19 20

13.4 kN

CGS-N24E Grip inner diameterø12 〜 ø16 has been available in two different models of the clamping force
1: ø9 , ø10 (CGS-N22E) are using the same cylinder.

Refer to page2 Gripø9 , ø10

Grip inner diameter

ø

9

10

19 and 20

Non-constant air blow model
Clamping force（hydraulic pressure 7 MPa）

Model

3.6 kNCGS-N22E Grip inner diameter 1

1： ø11 〜 ø16（ CGS-N22E）are using the same cylinder.

Refer to page

4 Gripø6 ~ ø8

Grip inner diameter

11

ø

6

ø

7

Air blow model
Clamping force

Model

1.3 kNCGS-N21- 06

2.2 kNCGS-N21- Grip inner diameter（hydraulic pressure 4 MPa）

8

21 and 22（hydraulic pressure 7 MPa）

CGS- N2□□□

7MPa

Expansion clamp

Doubleactingreduces air consumption and is measurably energy saving. Still, be sure to air blow at time of workpiece replacement.

GripperRod

3 Gripper

A

C

C

A
Scraper

When clamping

B

Secure chip protection

B

ScraperRod

Scraper3 Gripper

B-B

A-A

GripperRod

Even for the areas
where there is no
gripper, air blow
during cutting process is not necessary
as chip intrusion isprevented thanks tothe scraper.

C-CC
2 Gripper

A

A
Scraper

When clamping

B

B
C

Secure chip protection
Scraper

Scraper2 Gripper

Rod

A-A

B-B

C-C

GripperRod

4 Gripper

C
AA

When clamping

Scraper

B

B

Constant air blow isnecessary as sealing
will not take place
for the areas where
there is no gripper.

C

Space
ScraperSpace

4 Gripper

Rod

A-A

B-B

C-C

12

CGS- N22E□

3 GripExpansion clamp

7MPa

Non-constant air blow model

Doubleacting

PAT.

Non-constant air blow model

Grip inner diameterø11 ø12 ø13 ø14 ø15 ø16

Model

CGS-N22E Grip inner diameter

Clamping force

3.6 kN（hydraulic pressure 7 MPa）

Radial expansion force

11.1 kN（hydraulic pressure 7 MPa）

（Example：CGS-N22E11)

ø41：made to order
Model CGS-N22E with grip inner diameter ø11~ø16：
Rod

GripperDuring clamping, rod will stroke and expand scraper. Thanks
to a new mechanism, open space is removed between

Scraperrod, gripper, and scraper. As chip intrusion is prevented, airblow during cutting process has been eliminated. (Air blow
will only be necessary during clamping and unclamping
operation.) As a result, air consumption has been significantly
reduced compared to the traditional model.

Unclamp
Rod

Secure chip protection

GripperRod

GripperA

A

Scraper

ScraperRod

Gripper

When clamping

Specifications

A-A

Scraper

Clamp

Clamping force & hydraulic pressure
4

Number of grippers

3

Working pressure range(MPa)

Proof pressure

(MPa)

10.5

Clamping force 1

(kN)

3.57

Radial expansion force 1

(kN)

11.1

Taper rod stroke

(mm)

4.2

Clamp stroke

(mm)

1.2

1.5 ~ 7

Clamp

(cm 3)

2.5

Unclamp(cm 3)

3.9

Allowable eccentricity

(mm)

± 0.5

Recommended air blow pressure

(MPa)

0.3

Recommended seating
detection air pressure

(MPa)

0.2

(℃ )

0 ~ 70Cylindercapacity

Operating temperature

General mineral based hydraulic oil（ISO-VG32 equivalent）

Fluid used
Mass

(kg)

0.37

1: Capacity values for hydraulic pressure of 7 MPa are shown.
13

CGS-N22E

Clamping force (kN)Model

CGS-N22E Grip inner diameter
3

2

1

0
1.5

2

3

4

5

6

7

Hydraulic pressure (MPa)

Hydraulic pressure (MPa)Clamping force

1.5

2

3

4

5

6

7

(kN) 0.77 1.02 1.53 2.04 2.55 3.06 3.57

F: Clamping force (kN) = 0.510 × P: Hydraulic pressure (MPa)CGS- N22E□

CGS-N22E

Expansion clamp

11
12
13
11, 12, 13, 14, 15, 16
14
15
16

Clamping
hydraulicconnection
port

Mounting details
26.5

Seating detection air
outlet ø1

E

25.5
40

Seating detection
air connection port

3-Max.ø3

7

7

33

33

7

7

ø63

43.6

Doubleacting

7MPa

Non-constant air blow model

Air blow
connection port
4-ø5.5
Spot facing ø9.5

40
26.5

4-M5

M6×1 thread through(clamp removable tap)

25.5

ø41 H830°

Unclamping
side face piping range

20 ±0.1

15°

.4

(ø3)

Unclamping
bottom piping range

4.5

5 15 ±0.005

26.5

R0

Rz25

Unclamping hydraulicconnection port

19.5

46

∗

6.3

øT

Rz

Seating surface
inner diameter

1

Rz6.3

Rz6.3

Seating surface outer diameterøU+0.0390

ø40.8

O-ring (included) 2 - P5
(ﬂuorocarbon hardness Hs90)

O-ring (included) P5(ﬂuorocarbon
hardness Hs90)

ø40.5-0.025

ø41 f 7 -0.050+0.2
0Rz: ISO4287(1997)

O-ring (included)AS568-029(ﬂuorocarbon hardness Hs90)

details
Rod outer diameterøF4
øADGrip inner diameter usage requirements

R1°

Gripper outer diameter
øF3

6.1

11.5

30

Min. 6.1

Min. 12(H8 range)
Min.1063

6(5ﾟtapering)
Blind holeThrough hole(mm)

CGS-N22E Grip inner diameter

Model

CGS-N22E Grip inner diameter

Model

Workpiece material (hardness)

Aluminum, steel and others (HRC30 or below).
Cast iron also usable depending on conditions.

E

7.1

7.8

8.5

F3

10.5

11.5

12.5

F4

10.55

11.55

12.55

13.55

14.55

15.55

T

15

16

17

18

19

20

U

23

24

25

26

27

28

AD

8.2

9.2

10.2

11.2

12.2

13.2

Grip inner diameter(mm) 11 12 13 14 15 16

Allowable min. grip inner diameter (mm) 10.711.712.713.714.715.7
Allowable max. grip inner diameter (mm) 11.712.713.714.715.716.7
Grip inner diameter tapering angle (draft angle)

3ﾟor below

Grip inner diameter circularity

0.1 or below

Please inquire if above terms are not applied.

11

12

13

14

15

16

9.1

9.7

10.4

13.5

14.5

15.5

Note1. Mounting screws are not included.
2. Included O-ring must be used at all times.
3. Seating surface hardness is HRC55.

14

CGS- N23E□

3 GripExpansion clamp

7MPa

Non-constant air blow model

Doubleacting

PAT.

Non-constant air blow model

Grip inner diameterø12 ø13 ø14 ø15 ø16

Model

CGS-N23E Grip inner diameter

Clamping force

7.5 kN（hydraulic pressure 7 MPa）

Radial expansion force

23.3 kN（hydraulic pressure 7 MPa）

（Example：CGS-N23E12)

ø53：made to order
Model CGS-N23E with grip inner diameter ø12~ø16：
Rod

GripperDuring clamping, rod will stroke and expand scraper. Thanks
to a new mechanism, open space is removed between
rod, gripper, and scraper. As chip intrusion is prevented, airblow during cutting process has been eliminated. (Air blow
will only be necessary during clamping and unclamping
operation.) As a result, air consumption has been significantly
reduced compared to the traditional model.

Scraper

Unclamp
Rod

Secure chip protection

Gripper
Gripper

Rod

A

Rod

ScraperA
Gripper

Scraper

Clamp

When clamping

Specifications

Scraper

A-A

Clamping force & hydraulic pressure
8

CGS-N23E Grip inner diameter

Model

CGS-N23E

7

Number of grippers
Working pressure range(MPa)

1.5 ~ 7

Proof pressure

(MPa)

10.5

(kN)

7.48

Clamping force 1
1

(kN)

23.3

Taper rod stroke

(mm)

4.2

Clamp stroke

(mm）

1.2

(cm 3）

5.2

Radial expansion force

Cylindercapacity

Clamp
UnclampAllowable eccentricity

3

(cm ）

7.2

(mm)

± 0.5

Recommended air blow pressure(MPa)

Recommended seating
detection air pressure

(MPa)

0.2

(℃ )

0 ~ 70Operating temperature

Mass

(kg)

0.60

1: Capacity values for hydraulic pressure of 7 MPa are shown.
15

6
5
4
3
2
1
0
1.5

2

3

4

5

6

7

Hydraulic pressure (MPa)0.3

General mineral based hydraulic oil（ISO-VG32 equivalent）

Fluid used

Clamping force (kN)

3

Hydraulic pressure (MPa)Clamping force

1.5

2

3

4

5

6

7

(kN) 1.60 2.14 3.20 4.27 5.34 6.41 7.48

F: Clamping force (kN) = 1.068 × P: Hydraulic pressure(MPa)CGS- N23E□

Expansion clamp

Doubleacting

7MPa

Non-constant air blow model

CGS-N23E 12, 13, 14, 15, 16
Mounting details
Clamping
hydraulicconnection
port

32
48

Seating detection
air connection port

93-Max.ø3

9

43

9

43

9

ø77

55.6

32

Seating detection air
outlet ø1

E

Air blow
connection port
4-ø6.8Spot facing ø11
M8×1.25 thread through(clamp removable tap)

32
74

20 ±0.1

1
R0

.4

10°

Rz25

(ø3)

4.5

Unclamping hydraulicconnection port
Unclamping
O-ring (included) 2 - P5
bottom piping range(ﬂuorocarbon
hardness Hs90)

19.5

5 15 ±0.005

26.5

∗

6.3

øT

Rz

Seating surface
inner diameter+0.046
0

Rz6.3

Rz6.3

Seating surface outer diameterøU

46

ø53 H830°(H8 range)
Min.1032

4-M6

Unclamping
side face piping range

48

+0.2
0

ø52.8

Rz: ISO4287(1997)
O-ring (included) P5(ﬂuorocarbon
hardness Hs90)

O-ring (included)AS568-032(ﬂuorocarbon hardness Hs90)

ø52.5-0.030

ø53 f 7 -0.060

details
Rod outer diameter
øF4
øAD

30

Grip inner diameter usage requirements

Gripper outer diameter
øF3

6.1

11.5

°

Min. 6.1

Min. 12R1

6 (5ﾟtapering)
Blind holeThrough hole(mm)

CGS-N23E Grip inner diameter

Model

CGS-N23E Grip inner diameter

Model

Workpiece material (hardness)

Aluminum, steel and others (HRC30 or below).
Cast iron also usable depending on conditions.

E

5.5

6.3

7.2

7.9

8.7

F3

11.5

12.5

13.5

14.5

15.5

F4

11.55

12.55

13.55

14.55

15.55

T

16

17

18

19

20

U

24

25

26

27

28

AD

9.2

10.2

11.2

12.2

13.2

Grip inner diameter(mm) 12

13

14

15

16

Allowable min. grip inner diameter (mm) 11.7 12.7 13.7 14.7 15.7
Allowable max. grip inner diameter (mm) 12.7 13.7 14.7 15.7 16.7
Grip inner diameter tapering angle (draft angle)

3ﾟor below

Grip inner diameter circularity

0.1 or below

Please inquire if above terms are not applied.

12

13

14

15

16

Note1. Mounting screws are not included.
2. Included O-ring must be used at all times.
3. Seating surface hardness is HRC55.

16

CGS- N24E□

3 GripExpansion clamp

7MPa

Non-constant air blow model

Doubleacting

PAT.

Non-constant air blow model
ø17

Grip inner diameter

ø18

ø19

ø20

Model

CGS-N24E Grip inner diameter

Clamping force

13.4 kN（hydraulic pressure 7 MPa）

Radial expansion force

41.7 kN（hydraulic pressure 7 MPa）

（Example：CGS-N24E17)

ø67：made to order
Model CGS-N24E with grip inner diameter ø17~ø20：
Rod

During clamping, rod will stroke and expand scraper. Thanks

Gripper

to a new mechanism, open space is removed between
rod, gripper, and scraper. As chip intrusion is prevented, airblow during cutting process has been eliminated. (Air blow
will only be necessary during clamping and unclamping
operation.) As a result, air consumption has been significantly
reduced compared to the traditional model.
Scraper

Unclamp
Rod

Secure chip protection

GripperRod

GripperA

A

Rod

Scraper

Gripper

When clamping

Scraper

A-A

Scraper

Clamp

Specifications

Clamping force & hydraulic pressure
14

Number of grippers

3

11
10
9

Working pressure range(MPa)

1.5 ~ 7

Proof pressure

(MPa)

10.5

(kN)

13.4

Radial expansion force 1

(kN)

41.7

Taper rod stroke

(mm)

4.2

Clamp stroke

(mm）

1.2

Clamp

(cm 3）

9.4

1

Unclamp(cm 3）

12.3

Allowable eccentricity

0
1.5

(mm)

± 0.5

Recommended air blow pressure

(MPa)

0.3

Recommended seating
detection air pressure

(MPa)

0.2

(℃ )

0 ~ 70Clamping force

Cylindercapacity1

Operating temperature

General mineral based hydraulic oil（ISO-VG32 equivalent）

Fluid used
Mass

(kg)

1.20

1: Capacity values for hydraulic pressure of 7 MPa are shown.
17

12

Clamping force (kN)Model

CGS-N24E

13

CGS-N24E Grip inner diameter

8
7
6
5
4
3
2

2

3

4

5

6

7

Hydraulic pressure (MPa)

Hydraulic pressure (MPa)Clamping force

1.5

2

3

4

5

6

7

(kN) 2.88 3.84 5.76 7.68 9.60 11.51 13.43

F: Clamping force (kN) = 1.919 × P: Hydraulic pressure (MPa)CGS- N24E□

Expansion clamp

Doubleacting

7MPa

Non-constant air blow model

CGS-N24E 17, 18, 19, 20
Mounting details

ø9

Seating detection air
outlet ø1

E

39

39
60

6

3-Max. ø3

Seating detection
air connection port

16
53

F

16

16

53

69.6

16

Clamping hydraulicconnection port

Air blow
connection port
4-M8

4-ø9
Spot facing ø14
M10 thread through(clamp removable tap)

60
39+0.046

ø67 H8 0

30°
Rz6.3

Unclamping hydraulicconnection port

Unclamping
side face piping range

40°

5
15°

(ø3)
+0.2

66.8 0Unclamping
bottom piping range
O-ring (included) 2 - P5
(ﬂuorocarbon hardness Hs90)

4.5

36.5

Rz25

∗

25±0.005
5

59
22.5

.4

R0

6.3

Rz

Seating surface
inner diameterøT

23±0.1

Rz6.3

Seating surface outer diameter
øU

1

89

O-ring (included) P5(ﬂuorocarbon
hardness Hs90)(H8 range)
Min.1039

Rz: ISO4287(1997)

O-ring (included) AS568-143(ﬂuorocarbon hardness Hs90)

ø66.5-0.030
ø67 f7 -0.060

details
Rod outer diameter
øF4
øAD

R1

30°

7

Gripper outer diameterøF3

Min. 12

Min. 7

11.5

Grip inner diameter usage requirements

6 (5°tapering)

Blind holeThrough hole

(mm)
Model

CGS-N24E Grip inner diameter

Model

Workpiece material (hardness)

Aluminum, steel and others (HRC30 or below).
Cast iron also usable depending on conditions.

Grip inner diameter

(mm)

17

18

19

20

Allowable min. grip inner diameter (mm)

16.7

17.7

18.7

19.7

Allowable max. grip inner diameter (mm)

17.7

18.7

19.7

20.7

Grip inner diameter tapering angle (draft angle)

3ﾟor below

Grip inner diameter circularity

0.1 or below

Please inquire if above terms are not applied.

CGS-N24E Grip inner diameter
17

18

19

20

E

12.5

13.0

13.4

13.9

F

5.1

5.3

5.5

5.7

F3

16.5

17.5

18.5

19.5

F4

16.55

17.55

18.55

19.55

T

21

22

23

24

U

31

32

33

34

AD

14.2

15.2

16.2

17.2

Note1. Mounting screws are not included.
2. Included O-ring must be used at all times.
3. Seating surface hardness is HRC55.

18

CGS- N22E□

2 GripExpansion clamp

7MPa

Non-constant air blow model

Doubleacting

PAT.

Non-constant air blow model
ø9

Grip inner diameter

ø10

Model

CGS-N22E Grip inner diameter

Clamping force

3.6 kN（hydraulic pressure 7 MPa）

Radial expansion force

11.1 kN（hydraulic pressure 7 MPa）

（Example：CGS-N22E09)ø41

Model CGS-N22E with grip inner diameter ø9, ø10：Rod

During clamping, rod will stroke and expand scraper. Thanks

Gripper

to a new mechanism, open space is removed between
rod, gripper, and scraper. As chip intrusion is prevented, airblow during cutting process has been eliminated. (Air blow
will only be necessary during clamping and unclamping
operation.) As a result, air consumption has been significantly
reduced compared to the traditional model.
Scraper

Unclamp
Rod

Secure chip protection

GripperRod

GripperA

ScraperA
GripperRod

Specifications

A-A

Scraper

When clamping

Scraper

Clamp

Clamping force & hydraulic pressure
4

Number of grippers

2
1.5 ~ 7

Working pressure range(MPa)

Proof pressure

(MPa)

10.5

Clamping force 1

(kN)

3.57

Radial expansion force 1

(kN)

11.1

Taper rod stroke

(mm)

4.2

Clamp stroke

(mm）

1.2

(cm 3）

2.5

Cylindercapacity

Clamp

3

(cm ）

3.9

Allowable eccentricity

(mm)

± 0.5

Recommended air blow pressure

(MPa)

0.3

Recommended seating
detection air pressure

(MPa)

0.2

(℃ )

0 ~ 70Unclamp

Operating temperature

General mineral based hydraulic oil（ISO-VG32 equivalent）

Fluid used
Mass

(kg)

0.37

1: Capacity values for hydraulic pressure of 7 MPa are shown.
19

CGS-N22E

Clamping force (kN)Model

CGS-N22E Grip inner diameter
3

2

1

0
1.5

2

3

4

5

6

7

Hydraulic pressure (MPa)

Hydraulic pressure (MPa)Clamping force

1.5

2

3

4

5

6

7

(kN) 0.77 1.02 1.53 2.04 2.55 3.06 3.57

F: Clamping force (kN) = 0.510 × P: Hydraulic pressure (MPa)CGS- N22E□

Expansion clamp

Doubleacting

7MPa

Non-constant air blow model

CGS-N22E 09, 10
Mounting details

Clamping hydraulicconnection port

25.5
40

Seating detection
air connection port

3-Max.ø3

7

7

33

33

7

7

ø63

43.6

26.5

Seating detection air
outlet ø1

7

Air blow
connection port
4-ø5.5
Spot facing ø9.5
M6×1 thread through(clamp removable tap)

40
26.5

25.5

4-M5

ø41 H830°

1Unclamping
side face piping range

20 ±0.1

15°

.4

(ø3)

Unclamping
bottom piping range

4.5

5 15 ±0.005

25

R0

Rz25

Unclamping hydraulicconnection port

19.5

44.5

6.3

∗

Rz

Seating surface
inner diameter

øT

Rz6.3

Rz6.3

Seating surface outer diameterø23+0.0390O-ring (included) P5(ﬂuorocarbon
hardness Hs90)

ø40.5-0.025

ø41 f 7 -0.050+0.2

ø40.8 0O-ring (included) 2 - P5
(ﬂuorocarbon hardness Hs90)

Rz: ISO4287(1997)

O-ring (included)AS568-029(ﬂuorocarbon hardness Hs90)

details
Rod outer diameterøF4
øADGrip inner diameter usage requirements
10

30

R1

°

Gripper outer diameter
øF3

5.5

Min. 5.5

Min. 10.5(H8 range)
Min.1063

6 (5ﾟtapering)
Blind holeThrough hole(mm)

CGS-N22E Grip inner diameter

Model

CGS-N22E Grip inner diameter

Model

Workpiece material (hardness)

Aluminum, steel and others (HRC30 or below).
Cast iron also usable depending on conditions.

F3

8.5

9.5

F4

8.55

9.55

T

13

14

AD

6.8

7.8

Grip inner diameter

(mm)

9

10

Allowable min. grip inner diameter (mm)

8.7

9.7

Allowable max. grip inner diameter (mm)

9.7

10.7

Grip inner diameter tapering angle (draft angle)

3ﾟor below

Grip inner diameter circularity

0.1 or below

09

10

Note1. Mounting screws are not included.
2. Included O-ring must be used at all times.
3. Seating surface hardness is HRC55.

Please inquire if above terms are not applied.

20

CGS- N21- □Expansion clamp

4 Grip

7MPa

Air blow model

Doubleacting

PAT.

Air blow modelø6

Grip inner diameter

ø7

ø8

CGS-N21- Grip inner diameter

Model（Example：CGS-N21-06)

Clamping force

2.2 kN（hydraulic pressure 7 MPa）

Radial expansion force

6.9 kN（hydraulic pressure 7 MPa）

ø34

Grip inner diameter ø6: Clamping force 1.3 kN（hydraulic pressure 4 MPa）
Radial expansion force 4.0 kN（hydraulic pressure 4 MPa）

Rod

Model CGS-N21- with grip inner diameter ø6~ø8:

GripperDuring clamping, a space is created between the rod,
gripper, and scraper as a result of having a small diameter.
Constant air blow will be necessary to prevent intrusionof metal chips during the cutting process and during
clamping and unclamping.

Space
Scraper

UnclampRod

Rod

GripperA

A

Scraper

GripperRod

When clamping

Specifications

06

Number of grippers

07

Proof pressure(MPa)

1.5 ~ 7
10.5

(kN)

1.27

(kN)

4.0

2.23
6.9

Taper rod stroke

(mm)

4.2

Clamp stroke

(mm）

1.2

(cm 3）

1.6

Cylindercapacity

Clamp

08

3

(cm ）

2.5

Allowable eccentricity

(mm)

± 0.5

Recommended air blow pressure

(MPa)

0.3

Recommended seating
detection air pressure

(MPa)

0.2

(℃ )

0 ~ 70Unclamp

Operating temperature

General mineral based hydraulic oil（ISO-VG32 equivalent）

Fluid used
Mass

(kg)

0.29

1: Capacity values for hydraulic pressure of 7 MPa are shown.
For CGS-N21-06, however, capacity values for 4 MPa are shown.
21

3

Clamping force (kN)(MPa) 1.5 ~ 4

Radial expansion force

CGS-N21-06
Working pressure range

4

Working pressure range

1

A-A

Clamping force & hydraulic pressure

CGS-N21- Grip inner diameter

Clamping force 1

Scraper

Scraper

Clamp

Model

Gripper

CGS-N212

1

0
1.5

2

3

4

5

6

7

Hydraulic pressure (MPa)
Hydraulic pressure (MPa)Clamping force

1.5

2

3

4

5

6

7

(kN) 0.48 0.64 0.95 1.27 1.59 1.91 2.23

F: Clamping force (kN) = 0.318 × P: Hydraulic pressure (MPa)CGS- N21- □Expansion clamp

Doubleacting

7MPa

Air blow model

CGS-N21- 06, 07, 08
Mounting details

Seating detection
air connection port

5.5 5.5

3-Max. ø2.5

27

27

22
34

5.5 5.5

ø54

36.6

22.5

Seating detection air
outlet ø1

E

Clamping hydraulicconnection port

Air blow
connection port
4-ø4.5
Spot facing ø8
M5×0.8 thread through(clamp removable tap)

34
22.5

22

4-M4

54

1
.4

Unclamping
side face piping range

17.5

R0

Rz25

15°

∗

(ø3)
Unclamping hydraulicconnection port

5.5

Unclamping
bottom piping range

4.5

M

P

15 ±0.005

øT

6.3

Seating surface
inner diameterRz

18 ±0.1

Rz6.3

Rz6.3

Seating surface outer diameterøU+0.0390(H8 range)
Min.10ø34 H830°

O-ring (included) 2 - P4
(ﬂuorocarbon hardness Hs90)

O-ring (included) P4(ﬂuorocarbon
hardness Hs90)+0.2

ø33.8 0Rz: ISO4287(1997)

O-ring (included)AS568-025(ﬂuorocarbon hardness Hs90)

ø33.5

details
Rod outer diameter
Gripper outer diameterøR

-0.025

ø34 f 7 -0.050

øAD

F2

Min. F2

F1

Grip inner diameter usage requirements

Min. F1+0.5

AE

30°

5 (5ﾟtapering)
Blind holeThrough hole

(mm)

Model

CGS-N21- Grip inner diameter

Model

Workpiece material (hardness)

Aluminum, steel and others (HRC30 or below).
Cast iron also usable depending on conditions.

E
F1
F2
F5
M
P
R
T
U
AD
AE

Grip inner diameter

6

7

8

Allowable min. grip inner diameter (mm)

(mm)

5.7

6.7

7.7

Allowable max. grip inner diameter (mm)

6.7

7.7

8.7

Grip inner diameter tapering angle (draft angle)

3ﾟor below

Grip inner diameter circularity

0.1 or below

Please inquire if above terms are not applied.

06

CGS-N21- Grip inner diameter
07
5.8
9
5.5
2
41.5
24

5.5
10

6.5
11
19

4.3

5.3
R0.6

08
6.5
10
6
2.5
42.5
25
7.5
12
20
5.8
R1

Note1. Mounting screws are not included.
2. Included O-ring must be used at all times.
3. Seating surface hardness is HRC55.

22

CGS- N2□□□

7MPa

Expansion clamp

DoubleactingGripper set replacement
Number of grippers

4 Grippers

Gripper set model

Clamp modelSet description

CGS-N21-J06

CGS-N21-06

CGS-N21-J07

CGS-N21-07

CGS-N21-J08

CGS-N21-08

CGS-N22EJ09

CGS-N22E09

CGS-N22EJ10

CGS-N22E10

CGS-N22EJ11

CGS-N22E11

CGS-N22EJ12CGS-N22E12

CGS-N22EJ13

CGS-N22E13

CGS-N22EJ14

CGS-N22E14

CGS-N22EJ15

CGS-N22E15

CGS-N22EJ16

CGS-N22E16

CGS-N23EJ12CGS-N23E12

CGS-N23EJ13

CGS-N23E13

CGS-N23EJ14

CGS-N23E14

CGS-N23EJ15

CGS-N23E15

CGS-N23EJ16

CGS-N23E16

It is recommended that grippers, scrapers and O-rings
be replaced after about 200,000 operations.

CGS-N24EJ17

CGS-N24E17

CGS-N24EJ18

CGS-N24E18

Replace grippers in sets and not just individual grippers.
(Refer to the table on the left for the gripper set model.)CGS-N24EJ19

CGS-N24E19

CGS-N24EJ20

CGS-N24E20

O-ring × 1

2 Grippers

3 Grippers

Scraper × 1

Gripper（Refer totable left）

Grip inner diameter & rod height when clamping

Rod height12

Rod height (mm)

11

10

ø1 1

〜ø

9

8

ø8 〜

7

ø6 〜

20

ø1 0

Rod height calculation formulaø7
ø6 〜 ø7

6
-0.3

-0.2

Allowable min.
grip inner diameter

-0.1

0

0.1

Nominalgrip inner diameter

0.2

0.3

0.4

0.5

Actual grip inner diameter and： 7.82−2.35× nominal
grip diameter diﬀerence

0.7

Actual grip inner diameter andø8 〜 ø10 ： 8.82−2.35× nominal
grip diameter diﬀerence

Allowable max.
grip inner diameter

Actual grip inner diameter andø11 〜 ø20：10.32−2.35×nominal
grip diameter diﬀerence

0.6

Difference between clamping hole diameterand nominal grip diameter (mm)Example: When CGS-N22E10 (Nominal grip diameter: ø10）is
clamping ø9.8 hole
Rod height = 8.82 - 2.35 × (-0.2) = 9.29mm

23

CGS- N2□□□

Doubleacting

7MPa

Expansion clamp

System configuration example

expansion clamp
model CGS

Workpiece positioning pin（Circular）∗2

Workpiece
guide ∗1

expansion clamp
model CGS

Workpiece guide ∗1

expansion clamp
model CGS

Workpiece guide ∗1
Workpiece positioning pin（Circular）∗2

10mm or more

Workpiece positioning pin（Diamond-type cut）∗2

Grip innerdiameter D

Rod outer diameter d

Diametral space
D-d or lessexpansion clamp
model CGS

Workpiece positioning pin（Diamond-type cut）∗2

expansion clamp
model CGS

1: When using automatic or robotic conveyers, prevent damage to clamp caused from impact bysetting workpiece guides.
Using the above guide as reference, accurately position the holes when using workpiece guides.
2: The expansion clamp does not have a workpiece positioning function.
Please install workpiece positioning pins (or similar).

24

CGS- N2□□□

7MPa

Expansion clamp

DoubleactingCaution in use● Be sure to make inner diameter of air blow circuit 4mm ormore except for clamp mounting surface.

● Measure seating surface flatness with hydraulic pressure applied on clamping side, or by applying hydraulic pressure on
neither clamping nor unclamping side.

● Set the workpiece in such a way that the clamping hole ofworkpiece is perpendicular to seating surface. Clamping in● Set detection range of seating detection air sensor to 0.05

tilted condition results in uneven contact of gripper withmm or less from seating surface. Insert a feeler gauge be-hole, which leads to concentration of load that may cause

tween workpiece and seating surface to create detection dis-damage.

tance in order to perform setting accurately. Refer to instruction manual of air sensor for details on setting methods.

● Verify that there are no metal chips or debris on seating surface of clamping hole and clamp body before setting work-● Perform unclamping completion detection, clamping com-piece. Allowing intrusion of metal chips results in insecurepletion detection and incomplete clamping detection withclamping, which can lead to low grade of machining accu-

combination actions of pressure switch and sensor shown inracy.

table below.（Refer to hydraulic and air circuit diagram.）● Flaring (biting) of gripper into workpiece varies depending

Applications

Pressureswitch 1(P.S. 1)Pressureswitch 2(P.S. 2)Air
sensor

Unclamping completion detection

OFF

ON

ON

Clamping completion detection

ON

OFF

ON

Incomplete clamping detection

ON

OFF

OFF

on workpiece material or thermal processing conditions.
With regards to conditions of workpiece and clamping hole,refer to page → 1 4 , 1 6 , 1 8 , 2 0 , 2 2 . Secure clamping is
not possible when workpiece or clamping hole that does notsatisfy these conditions is used.
● If clamping hole serves as taper hole (cast draft hole withgradient), then perform test clamping using applicable work-: In case of a lightweight workpiece or the like, sensor may
be OFF.

piece beforehand to verify that there are no problems with
operations.
● Deformation may occur if the thickness of clamping hole section of workpiece is extremely thin. Use applicable workpiece
to perform test clamping beforehand to verify that there are
no deformations in thin portion.
● Supply the dry and filtered air. Particulate size 5μm or less isrecommended.

Air sensor recommended condition of use
ISA3-F/G series
Supplier andmodel

Air supply
pressure

25

manufactured by SMC

GPS2-05 , GPS3-E series
manufactured by CKD
0.2 MPa

Inner diameterof pipingø4 mm (ISA3-F：ø2.5 mm)

Overall piping
length5 m or less

● Use a solenoid valve with needle for air sensor unit andcontrol it supplying air all the time in order to eliminate
intrusion of chips or coolant.
● There is a case that air sensing cannot be made successfully
as designed when it is used out of the usage shown on theleft. Contact Technical service center for more details.

CGS- N2□□□

7MPa

Expansion clamp

DoubleactingNon-constant air blow model hydraulic and pneumatic circuit diagram

P.S. 1

Air sensor unit
(The circuit diagram is subject to change according to the model of sensor.)

5μm
Clamping
hydraulic pressure

Seating
detection air

0.2MPa(Recommended air pressure)

P.S. 2

Switching valve
5μm
Unclamping
hydraulic pressure

Air blow(

Flow control valve

Opened toatmospherewhen OFF)

0.3MPa(Recommended air pressure)(Meter-out control)● Be sure to install a flow control valve for meter-out control in unclamping hydraulic circuit and to adjust clamping speed by means of back pressure. (0.3 seconds and over when full stroking.) Immediate pressure release of
unclamping side of the clamp causes insufficient grip at wall of clamping hole, which may result in incomplete
clamping.
● Air blow will not be necessary during cutting process. Be sure to air blow upon loading and unloading workpiece
and when clamping and unclamping to remove metal chips and debris.
● Be sure to turn air blow OFF while seating detection is occurring. Also, be sure to use an air switching valve that is
opened to atmosphere when air blow is OFF. (When incomplete clamping occurs, it is used as a seating detection
air exhaust path.

Air blow model hydraulic and pneumatic circuit diagram

P.S. 1

Air sensor unit
(The circuit diagram is subject to change according to the model of sensor.)

5μm
Clamping
hydraulic pressure

Seating
detection air

0.2MPa(Recommended air pressure)

P.S. 25μm
Unclamping
hydraulic pressure

Air blow
0.3MPa(Recommended air pressure)

Flow control valve(Meter-out control)● Be sure to install a flow control valve for meter-out control in unclamping hydraulic circuit and to adjust clamping speed by means of back pressure. (0.3 seconds and over when full stroking.) Immediate pressure release of
unclamping side of the clamp causes insufficient grip at wall of clamping hole, which may result in incomplete
clamping.
● Be sure to air blow upon loading and unloading workpiece and when clamping and unclamping. During cutting, if
chips adhere to the gripper such as when going through the clamp hole, continue air blowing during processing
as well.

26

CG□

Expansion clamp

Standard

Long neck

Product lines

Long neck

Eccentric（no seating）

model

CGC

Clamp
Unclamp

7MPa
7MPa

model

CGT

Clamp
Unclamp

7MPa
7MPa

model

CGT-R

CGU

Clamp
Unclamp

Clamp
Unclamp

7MPa
7MPa

Seating surface is set apart from clamp.

27

model

7MPa
7MPa

CG□

Expansion clamp

Product lines

air

air

air

Flat

Standard

Long neckLong neck

model

model

model

model

CGS-N1

Clamp
Unclamp7MPaspringCGE

Clamp
Unclampair
air

CGY-F2CGY-F3Clamp
Unclamp

Clamp
Unclampair
airspringair

Refer to separate documents for details.

28

Itami, Hyogo, Japan 664-8502
TEL. 072-777-3333 FAX. 072-777-3520

CERTIFICATE OF APPROVAL ISO9001

CLS-38E-92023. 04

Specifications are subject to change without prior notice.