Side Deflecto r TM B all Sc r ew

AD/AH Series

KURODA PRECISION INDUSTRIES LTD.

Smaller,quieter,
faster.

Nut dimensions are
DIN standard* compatiblefor easier use.
Screw shaft

New Circulation Method

Nut

A new circulation method (SIDE DEFLECTORTM) is used
to achieve an optimal recirculation structure and an idealtransition for the ball into the recirculation passage.
This design contributes to a more compact nut, higher
speed, and quieter operation.
The nut dimensions are DIN standard* compatible, for a nut
that is both compact and easy to use.

Side deflector* Parts are shown colored above for improved visibility.

* DIN standards are a set of industrial standards created by the German Institute for Standardization (Deutsches Institut für Normunge.V.), that are widely used in various industrial fields across Europe, Asia and elsewhere. The nut dimensions for this product arecompatible with DIN69051.
* SIDE DEFLECTOR is a registered trademark of KURODA.

2

The SIDE DEFLECTORTM method
delivers industry-leading performance.
High Speed
AH Serie s

Designed to meet the needs of recent developments in

150,000

automation as well as applications with strict takt timerequirements, AD/AH Series Side Deflector Ball Screws offer

120,000

This high speed capability keeps in step with improvements inhigh performance motors.
AD/AH Series ball screws deliver a maximum DN value of

DN valuegreatly increased maximum rotational speeds and DN values.

D N v al ue:
150,000
C onv ent i onal
preci s i on
bal l s crew(t ube met hod)

90,00060,000150,000 (twice that of conventional products) and a maximum
rotational speed of 5,000 min-1.

D N v al ue:
70,00030,0000

Quiet
to conventional tube recirculation method ball screws.
Additionally, the AD/AH Series design greatly reduces highfrequency sound, which provides a pleasing improvement insonic performance.

Sound pressureSound pressure has been reduced up to 6dB when compared

KURODA
Conventional Product

A Series

Compact
In an effort to support the space efficiency of our customers`

65 mm

57 mm

equipment, Kuroda has developed a streamlined nut body witha compact flange, reducing nut size by 30% and nut weight by
up to 50% when compared to conventional options.

Ø46

Ø36

15 mm

10 mm

G Series

A Series

Size: 2010

Size: 2010

* SIDE DEFLECTOR is a registered trademark of KURODA.
* The allowable rotational speed is the DN value, maximum rotational speed, or dangerous speed, whichever is lowest. Be sure to use
the product at this allowable rotational speed or lower.

3

Equipped as standard with LUBSEALTM lubrication unit
for long-term maintenance-free operation.
Lubrication Unit Features

Screw shaft

The “LUBSEAL” is a lubrication unit that is fitted in contact withNut

the shaft thread and supplies a proper amount of lubricant.
Built into the nut, LUBSEAL supplies the lubricating oil
contained therein to the thread groove, entering the load region
as the nut moves.
This contact type lubrication unit prevents contaminants fromentering or excessive lubricant from flowing out, resulting in a
lubrication unit that takes both contact area and contactpressure into consideration while also providing low sliding

LUBSEAL

resistance.

LUBSEAL coverSpace Saving
Designed to maximize ball screw performance without
sacrificing shaft length, “LUBSEALTM” lubrication units prolong
the period of maintenance-free operation with no loss in rangeof motion.
It is designed to have no effect on the mounting space or
stroke, avoiding the need to redesign equipment to maximizeball screw performance.

Built into nut

Structure and Performance
LUBSEALTM makes contact with the raceway of the screw shaft thread groove. The lubricant contained in the nut is supplied to the raceway of thescrew shaft through LUBSEALTM, ensuring that lubricant is supplied continuously and in just the right amount.
It also reduces the outflow of lubricating oil from the nut compared with other wipers or seals, reducing the amount of lubricant used even over long-term
travel, and maintaining lubrication performance.
When tested under in-house experiment conditions, products achieved a travel durability of 50,000 km over.
[Test conditions]
Screw shaft diameter φ15 mm
With LUBSEAL

Lead 20 mm(lubrication grease inserted)

Axial clearance 0.005 mm or less
Normal operation after 50,000 km

Rotational speed 3,000 min-1
Stroke 400 mm(no lubrication grease inserted)

Operation failure after 2.7 km

LUBSEAL
Contact with thread groove

LUBSEAL cover
Cover built into nut

4

1

10

100

1,000

10,000Travel distance [km]100,000

Side Deflector TM Ball Screw

AD/AH Series
AD Series Page 7 on
Screw shaft nominal diameter Ø16
Lead

5 mm

Lead

5 mm
10 mm

16 mm

16 mm

20 mm

20 mm

5 mm

Screw shaft nominal diameter Ø20
Lead

5 mm

10 mm

10 mm

20 mm

20 mm

Screw shaft nominal diameter Ø25
Lead

Screw shaft nominal diameter Ø16

10 mm

Screw shaft nominal diameter Ø20
Lead

AH Series Page 15 on

5 mm

Screw shaft nominal diameter Ø25
Lead

5 mm

10 mm

10 mm

25 mm

25 mm

A Series
Ball Screw

5Application Examples
The AD/AH ball screws are ideal for a wide range of fields: semiconductor and LCD manufacturing equipment, transport robots,
medical equipment, and inspection equipment.

Ball Screw Specifications
Series lineup: AH Series, AD Series
Screw shaft nominal diameter: Available in three sizes (φ16, φ20, φ25)
Lead: 5 mm, 10 mm, 16 mm, 20 mm, 25 mm (varies by screw shaft nominal diameter)* The allowable rotational speed is the lowest value of the maximum rotational speed, DN value, and dangerous speed.
Shaft end shape (fixed end): Recommended shape available
Shaft end shape (supported end): Recommended shape available
SeriesAD Series
Screw Shaft Nominal
Diameter

5
10
16
20
5
10
20
5
10
25

16

Lineup20

25

Accuracy GradeAH Series
Screw Shaft Nominal
DiameterLead

Lubrication Unit
Maximum Rotational Speed
DN Value

5
10
16
20
5
10
20
5
10
25

16

20

25

C7
0.010 mm or less0.005 mm or less
LUBSEALTM
5,000 min-1
100,000

Axial Clearance

Lead

C5
0.005 mm or less
0 mm (preloaded)
LUBSEALTM
5,000 min-1
150,000

Lubrication Unit LUBSEAL (Included)
A Series ball screws come equipped with KURODA`s acclaimed LUBSEAL lubrication units.
The “LUBSEAL” is a lubrication unit that is fitted in contact with the shaft thread and supplies a proper amount of lubricant.
Designed to maximize ball screw performance without sacrificing shaft length, “LUBSEAL” lubrication units prolong the period of
maintenance-free operation with no loss in range of motion.
This standard feature of A Series ball screws prevents damage to the operation zone of the nut and allows for long-term maintainance-free use.
[Test conditions]
Screw shaft diameter φ15 mm
With LUBSEAL

Lead 20 mm(lubrication grease inserted)

Axial clearance 0.005 mm or less
Normal operation after 50,000 km

Rotational speed 3,000 min-1
Stroke 400 mm(no lubrication grease inserted)

Operation failure after 2.7 km

LUBSEAL
Contact with thread groove

LUBSEAL cover
Cover built into nut

6

1

10

100

1,000

10,000Travel distance [km]100,000AD Series

AD Series Ball Screws
Ball Screw Specifications
Screw shaft nominal diameter: φ16, φ20, φ25
Lead: 5 mm, 10 mm, 16 mm, 20 mm, 25 mm (available lead depends on screw shaft nominal diameter)
Accuracy grade: C7 Grade
Axial clearance: 0.010 mm or less / 0.005 mm or lessLubrication unit: LUBSEALTM
Maximum rotational speed: 5,000 min-1
DN value: 100,000

Model Number

Screw Shaft
Nominal Diameterd[mm]

AD16054S-HSSR
AD16103S-HSSR
AD16162S-HSSR

16

AD16202S-HSSR
AD20054S-HSSR
AD20103S-HSSR

20

Lead
L
[mm]

Basic Dynamic
Load Rating
C[N]

Basic Static
Load Rating
C0
[N]

5

7,600

12,000

10

5,700

8,700

16

3,800

5,500

20

3,700

5,500

5

10,40018,50010

7,800

13,400

AD20202S-HSSR

20

5,100

8,500

AD25054S-HSSR

5

11,40023,10010

8,700

16,90025

5,700

10,600AD25103S-HSSR

25

AD25252S-HSSR

Maximum
Accuracy
Lubrication Unit
Axial Clearance
Rotational Speed
Grade/Wiper[min-1]C7

0.010 or less0.005 or less

LUBSEALTM

5,000(DN ≤ 100,000)

End Machining
Recommended shaft end configurations are available for each size of AD Series ball screws.
Additional machining for keyways, tap holes, D-cut machining and so on are also available upon request.

Optional Specifications
Surface treatment for AD Series ball screws is also available.
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available upon request.
Please contact us for details.

Lubrication Unit
AD Series ball screws come equipped with LUBSEALTM lubrication units.

7

Screw Shaft Nominal Diameter φ16 

AD Series

Ball Screw Specifications
Nominal Model

AD16054S

AD16103S

AD16162S

AD16202S

Nominal Diameter [mm] - Lead [mm]16 - 516 - 1016 - 16

16 - 20

Number of Circuits / Thread Direction

3.7 turns per row / Right

2.7 turns per row / Right

1.7 turns per row / Right

1.7 turns per row / Right

Ball Diameter [mm]

2.778

2.778

2.778

2.778

Root Diameter [mm]

12.7

12.7

12.7

12.7

Basic Dynamic Load Rating C [N]

7,600

5,700

3,800

3,700

Basic Static Load Rating C0 [N]

12,000

8,700

5,500

5,500

Accuracy Grade

C7

C7

C7

C7

H / 0.010 or less
F / 0.005 or lessH / 0.010 or less
F / 0.005 or lessH / 0.010 or less
F / 0.005 or lessH / 0.010 or less
F / 0.005 or lessBall Re-Circulation System

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Wiper / Lubrication Unit

LUBSEALTM

LUBSEALTM

LUBSEALTM

LUBSEALTM

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

5,000
DN ≤ 100,000

5,000
DN ≤ 100,000

5,000
DN ≤ 100,000

5,000
DN ≤ 100,000

Clearance Symbol / Axial Clearance [mm]Lubricant-1

Maximum Rotational Speed [min ]6-M drilled

Lt
Lf

LUBSEAL both ends

45°

T
5

M6 x 1A

45°(Oil Hole)

ØD1

(Ød)

B2

22.5°

ØD g6

-0.2

ØD -0.3

PCD

X
A

480 (Hardened portion)
730 (Hardened portion)
960 (Hardened portion)
1,460 (Hardened portion)

NominalModel

NominalDiameterLead
Ph

Nut Dimensions
Screw Shaft
Diameter Outer Diameter Flange Diameter Total Length Thickness Body Length Length Mounting Hole Mounting Hole Diameter Width
d
D1
Lt
T
Lf
B2
PCD
M
X
D

AD16054S

5

47

37

AD16103S

10

57

47

AD16162S

16

15

16

AD16202S

28

48

58

20

10

10

48

66

38

5.5

40

56

Guide to Model Numbers
AD16054S-

HS

Nominal Model
AD16054S
AD16103S
AD16162S
AD16202S

8

S

R

-

0480

X

Type of Wiper
S: LUBSEAL

0415

-

C7

Thread Length
Unit: mm
Overall Screw
Shaft Length
Unit: mmH
Clearance Symbol
H : 0.010 mm or less
F : 0.005 mm or lessLead Accuracy

Shaft End Design
Recommended shaft end configurations are available by size for AD Series ball screws.
As well as our recommended shaft end configuration below, additional machining for keyways, tap holes, D-cut machining, etc. are also available upon request.
Model example: Shaft end not machined (left page)
AD16054S-HSSR-0480A

AD Series

A sample machined shaft end configuration is shown below.
Shaft end machined
AD16054S-HSSR- 0480 X 0415 -C7H
Thread Length
Overall Screw Shaft Length

Fixed End0

R0.2 or less

+0.1

(1)

0.9 0

+0.1
7.9 0

M10 x 1

10

10
75

10

0

Collar(Model: GY/W-C10)

Ø140

Ø8 -0.015

Ø10 -0.015

12 -0.25

0Ø7.6 -0.06

0Ø8 -0.015

Supported End

40

15
55

Applicable Support Units
Applicable supported end support units

Applicable fixed end support units

BUK-8S (square) Refer to page 22

BUK-10F (square) Refer to page 22

BUM-8S (round) Refer to page 23

BUM-10F (round) Refer to page 23

Optional Specifications
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available.

9Screw Shaft Nominal Diameter φ20 

AD Series

Ball Screw Specifications
Nominal Model

AD20054S

AD20103S

AD20202S

Nominal Diameter [mm] - Lead [mm]20 - 520 - 1020 - 20

Number of Circuits / Thread Direction

3.7 turns per row / Right

2.7 turns per row / Right

1.7 turns per row / Right

Ball Diameter [mm]

3.175

3.175

3.175

Root Diameter [mm]

17.5

17.5

17.5

Basic Dynamic Load Rating C [N]

10,400

7,800

5,100

Basic Static Load Rating C0 [N]

18,50013,4008,500

Accuracy Grade

C7

C7

C7

H / 0.010 or less
F / 0.005 or lessH / 0.010 or less
F / 0.005 or lessH / 0.010 or less
F / 0.005 or lessBall Re-Circulation System

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Wiper / Lubrication Unit

LUBSEALTM

LUBSEALTM

LUBSEALTM

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

5,000
DN ≤ 100,000

5,000
DN ≤ 100,000

5,000
DN ≤ 100,000

Clearance Symbol / Axial Clearance [mm]Lubricant-1

Maximum Rotational Speed [min ]6-M drilled

Lt
Lf

LUBSEAL both ends

45°

T
5

M6 x 1A

45°(Oil Hole)

ØD1

(Ød)

B2

22.5°

ØD g6

-0.2

ØD -0.3

PCD

X
A

480 (Hardened portion)
730 (Hardened portion)
960 (Hardened portion)
1,460 (Hardened portion)
2,000 (Hardened portion)

NominalModel

NominalDiameter

Lead
Ph

20

10

AD20054S
AD20103S

Nut Dimensions
Screw Shaft
Diameter Outer Diameter Flange Diameter Total Length Thickness Body Length Length Mounting Hole Mounting Hole Diameter Width
d
D
D1
Lt
T
Lf
B2
PCD
M
X

5

AD20202S

50
20

36

58

57

20

40
10

47

66

10

47

6.6

44

56

Guide to Model Numbers
AD20103S-

HS

Nominal Model
AD20054S
AD20103S
AD20202S

10

S

R

-

0730

X

Type of Wiper
S: LUBSEAL

0643

-

C7

Thread Length
Unit: mm
Overall Screw
Shaft Length
Unit: mmH
Clearance Symbol
H : 0.010 mm or less
F : 0.005 mm or lessLead Accuracy

Shaft End Design
Recommended shaft end configurations are available by size for AD Series ball screws.
As well as our recommended shaft end configuration below, additional machining for keyways, tap holes, D-cut machining, etc. are also available upon request.
Model example: Shaft end not machined (left page)
AD20103S-HSSR-0730A

AD Series

A sample machined shaft end configuration is shown below.
Shaft end machined
AD20103S-HSSR- 0730 X 0643 -C7H
Thread Length
Overall Screw Shaft Length

Fixed End

0

R0.3 or less

1.15

+0.14
0

10.15

0

0

Ø15 -0.018

(1)

+0.1
0

M15 x 1

15

15
95

12

Ø20

Collar(Model: GY/W-C15)

Ø12 -0.018

17 -0.25

0Ø14.3 -0.11

0Ø15 -0.018

Supported End

55

20
75

Applicable Support Units
Applicable supported end support units

Applicable fixed end support units

BUK-15S (square) Refer to page 22

BUK-15F (square) Refer to page 22

BUM-15S (round) Refer to page 23

BUM-15F (round) Refer to page 23

Optional Specifications
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available.

11

Screw Shaft Nominal Diameter φ25 

AD Series

Ball Screw Specifications
Nominal Model

AD25054S

AD25103S

AD25252S

Nominal Diameter [mm] - Lead [mm]25 - 525 - 1025 - 25

Number of Circuits / Thread Direction

3.7 turns per row / Right

2.7 turns per row / Right

1.7 turns per row / Right

Ball Diameter [mm]

3.175

3.175

3.175

Root Diameter [mm]

22.5

22.5

22.5

Basic Dynamic Load Rating C [N]

11,400

8,700

5,700

Basic Static Load Rating C0 [N]

23,10016,90010,600Accuracy Grade

C7

C7

C7

H / 0.010 or less
F / 0.005 or lessH / 0.010 or less
F / 0.005 or lessH / 0.010 or less
F / 0.005 or lessBall Re-Circulation System

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Wiper / Lubrication Unit

LUBSEALTM

LUBSEALTM

LUBSEALTM

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

5,000
DN ≤ 100,000

5,000
DN ≤ 100,000

5,000
DN ≤ 100,000

Clearance Symbol / Axial Clearance [mm]Lubricant-1

Maximum Rotational Speed [min ]6-M drilled

Lt
Lf

LUBSEAL both ends

45°
22.5°

T
5

M6 x 1A(Oil Hole)

ØD1

(Ød)

B2

45°

ØD g6

-0.2

ØD -0.3

PCD

X
A

480 (Hardened portion)
730 (Hardened portion)
960 (Hardened portion)
1,460 (Hardened portion)
2,000 (Hardened portion)

NominalModel

NominalDiameter

Lead
Ph

25

10

AD25054S
AD25103S

Nut Dimensions
Screw Shaft
Diameter Outer Diameter Flange Diameter Total Length Thickness Body Length Length Mounting Hole Mounting Hole Diameter Width
d
D
D1
Lt
T
Lf
B2
PCD
M
X

5

AD25252S

47
25

40

62

57

25

37
10

47

76

10

51

6.6

48

66

Guide to Model Numbers
AD25252S-

HS

Nominal Model
AD25054S
AD25103S
AD25252S

12

S

R

-

1460

X

Type of Wiper
S: LUBSEAL

1342

-

C7

Thread Length
Unit: mm
Overall Screw
Shaft Length
Unit: mmH
Clearance Symbol
H : 0.010 mm or less
F : 0.005 mm or lessLead Accuracy

Shaft End Design
Recommended shaft end configurations are available by size for AD Series ball screws.
As well as our recommended shaft end configuration below, additional machining for keyways, tap holes, D-cut machining, etc. are also available upon request.
Model example: Shaft end not machined (left page)
AD25252S-HSSR-1460A

AD Series

A sample machined shaft end configuration is shown below.
Shaft end machined
AD25252S-HSSR- 1460 X 1342 -C7H
Thread Length
Overall Screw Shaft Length

Fixed End

0

1.35

+0.14
0

15.35

(1)

+0.1
0

0

M20 x 1

16

20
12 5

18

Ø15 -0.018

0Collar(Model: GY/W-C20)

R0.3 or less

Ø20 -0.021

22 -0.35

Ø25

0

Ø19 -0.21

0Ø20 -0.021

Supported End

73

27
100

Applicable Support Units
Applicable supported end support units

Applicable fixed end support units

BUK-20S (square) Refer to page 22

BUK-20F (square) Refer to page 22

BUM-20S (round) Refer to page 23

BUM-20F (round) Refer to page 23

Optional Specifications
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available.

13

Memo

14

AH Series Ball Screws
Ball Screw Specifications
Screw shaft nominal diameter: φ16, φ20, φ25
Lead: 5 mm, 10 mm, 16 mm, 20 mm, 25 mm (available lead depends on screw shaft nominal diameter)
Accuracy grade: C5 Grade
Axial clearance: 0.005 mm or less / 0 mm (Preloaded)
Lubrication unit: LUBSEALTM
Maximum rotational speed: 5,000 min-1

Model Number

Screw Shaft
Nominal Diameterd[mm]

AH16054S-HSSR
AH16103S-HSSR
AH16162S-HSSR

16

AH16202S-HSSR
AH20054S-HSSR
AH20103S-HSSR

20

Lead
L
[mm]

Basic Dynamic
Load Rating
C[N]

Basic Static
Load Rating
C0
[N]

5

8,400

13,300

10

6,300

9,700

16

4,200

6,100

20

4,100

6,100

5

11,50020,500108,700

14,900

AH20202S-HSSR

20

5,700

9,400

AH25054S-HSSR

512,70025,700109,700

18,80025

6,300

11,800

AH25103S-HSSR

25

AH25252S-HSSR

Maximum
Accuracy
Lubrication Unit
Axial Clearance
Rotational Speed
Grade/Wiper[min-1]C5

0.005 or less
0 (Preloaded)

LUBSEALTM

AH Series

DN value: 150,000

5,000(DN ≤ 150,000)

End Machining
Recommended shaft end configurations are available for each size of AH Series ball screws.
Additional machining for keyways, tap holes, D-cut machining and so on are also available upon request.

Optional Specifications
Surface treatment for AH Series ball screws is also available.
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available upon request.
Please contact us for details.

Lubrication Unit
AH Series ball screws come equipped with LUBSEALTM lubrication units.

15

Screw Shaft Nominal Diameter φ16 

AH Series

Ball Screw Specifications
Nominal Model

AH16054S

AH16103S

AH16162S

AH16202S

Nominal Diameter [mm] - Lead [mm]16 - 516 - 1016 - 16

16 - 20

Number of Circuits / Thread Direction

3.7 turns per row / Right

2.7 turns per row / Right

1.7 turns per row / Right

1.7 turns per row / Right

Ball Diameter [mm]

2.778

2.778

2.778

2.778

Root Diameter [mm]

12.7

12.7

12.7

12.7

Basic Dynamic Load Rating C [N]

8,400

6,300

4,200

4,100

Basic Static Load Rating C0 [N]

13,300

9,700

6,100

6,100

Accuracy Grade

C5

C5

C5

C5

F / 0.005 or lessS / 0 (Preloaded)

F / 0.005 or lessS / 0 (Preloaded)

F / 0.005 or lessS / 0 (Preloaded)

F / 0.005 or lessS / 0 (Preloaded)

Ball Re-Circulation System

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Wiper / Lubrication Unit

LUBSEALTM

LUBSEALTM

LUBSEALTM

LUBSEALTM

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

5,000
DN ≤ 150,000

5,000
DN ≤ 150,000

5,000
DN ≤ 150,000

5,000
DN ≤ 150,000

Clearance Symbol / Axial Clearance [mm]Lubricant-1

Maximum Rotational Speed [min ]6-M drilled

Lt
Lf

LUBSEAL both ends

45°

T
5

M6 x 1A

45°(Oil Hole)

ØD1

(Ød)

B2

22.5°

ØD g6

-0.2

ØD -0.3

PCD

X
A

480 (Hardened portion)
730 (Hardened portion)
960 (Hardened portion)
1,460 (Hardened portion)

NominalModel
AH16054S
AH16103S
AH16162S
AH16202S

NominalDiameter

Lead
Ph

16

5
10
16
20

Nut Dimensions
Screw Shaft
Diameter Outer Diameter Flange Diameter Total Length Thickness Body Length Length Mounting Hole Mounting Hole Diameter Width
d
D
D1
Lt
T
Lf
B2
PCD
M
X
47
37
57
47
15
28
48
10
10
38
5.5
40
58
48
66
56

Guide to Model Numbers
AH16054S-

HS

Nominal Model
AH16054S
AH16103S
AH16162S
AH16202S

16

S

R

-

0480

X

Type of Wiper
S: LUBSEAL

0415

-

C5

Thread Length
Unit: mm
Overall Screw
Shaft Length
Unit: mmF
Clearance Symbol
F : 0.005 mm or less
S : 0 (Preloaded)
Lead Accuracy

Shaft End Design
Recommended shaft end configurations are available by size for AH Series ball screws.
As well as our recommended shaft end configuration below, additional machining for keyways, tap holes, D-cut machining, etc. are also available upon request.
A sample machined shaft end configuration is shown below.
Model example: Shaft end not machined (left page)
AH16054S-HSSR-0480A

Shaft end machined
AH16054S-HSSR- 0480 X 0415 -C5F
Thread Length
Overall Screw Shaft LengthØ8 -0.015

Ø10 -0.015

+0.1

(1)

0.9 0

+0.1
7.9 0

M10 x 1

10

10
75

10

0

0

R0.2 or less

Ø14

Collar(Model: GY/W-C10)

AH Series

Fixed End0

12 -0.25

0Ø7.6 -0.06

0Ø8 -0.015

Supported End

40

15
55

Applicable Support Units
Applicable supported end support units

Applicable fixed end support units

BUK-8S (square) Refer to page 22

BUK-10F (square) Refer to page 22

BUM-8S (round) Refer to page 23

BUM-10F (round) Refer to page 23

Optional Specifications
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available.

17

Screw Shaft Nominal Diameter φ20 

AH Series

Ball Screw Specifications
Nominal Model

AH20054S

AH20103S

AH20202S

Nominal Diameter [mm] - Lead [mm]20 - 520 - 1020 - 20

Number of Circuits / Thread Direction

3.7 turns per row / Right

2.7 turns per row / Right

1.7 turns per row / Right

Ball Diameter [mm]

3.175

3.175

3.175

Root Diameter [mm]

17.5

17.5

17.5

Basic Dynamic Load Rating C [N]

11,500

8,700

5,700

Basic Static Load Rating C0 [N]

20,50014,9009,400

Accuracy Grade

C5

C5

C5

F / 0.005 or lessS / 0 (Preloaded)

F / 0.005 or lessS / 0 (Preloaded)

F / 0.005 or lessS / 0 (Preloaded)

Ball Re-Circulation System

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Wiper / Lubrication Unit

LUBSEALTM

LUBSEALTM

LUBSEALTM

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

5,000
DN ≤ 150,000

5,000
DN ≤ 150,000

5,000
DN ≤ 150,000

Clearance Symbol / Axial Clearance [mm]Lubricant-1

Maximum Rotational Speed [min ]6-M drilled

Lt
Lf

LUBSEAL both ends

45°

T
5

M6 x 1A

45°(Oil Hole)

ØD1

(Ød)

B2

22.5°

ØD g6

-0.2

ØD -0.3

PCD

X
A

480 (Hardened portion)
730 (Hardened portion)
960 (Hardened portion)
1,460 (Hardened portion)

NominalModel

Nominaldiameter

Lead
Ph

20

10

AH20054S
AH20103S

Nut Dimensions
Screw Shaft
Diameter Outer Diameter Flange Diameter Total Length Thickness Body Length Length Mounting Hole Mounting Hole Diameter Width
d
D
D1
Lt
T
Lf
B2
PCD
M
X

5

AH20202S

50
20

36

58

57

20

40
10

47

66

10

47

6.6

44

56

Guide to Model Numbers
AH20103S-

HS

Nominal Model
AH20054S
AH20103S
AH20202S

18

S

R

-

0730

X

Type of Wiper
S: LUBSEAL

0643

-

C5

Thread Length
Unit: mm
Overall Screw
Shaft Length
Unit: mmF
Clearance Symbol
F : 0.005 mm or less
S : 0 (Preloaded)
Lead Accuracy

Shaft End Design
Recommended shaft end configurations are available by size for AH Series ball screws.
As well as our recommended shaft end configuration below, additional machining for keyways, tap holes, D-cut machining, etc. are also available uponrequest. A sample machined shaft end configuration is shown below.
Model example: Shaft end not machined (left page)
AH20103S-HSSR-0730A

Shaft end machined
AH20103S-HSSR- 0730 X 0643 -C5F
Thread Length
Overall Screw Shaft Length

R0.3 or less

1.15

+0.14
0

10.15

Ø12 -0.018

00Ø15 -0.018

(1)

+0.1
0

M15 x 1

15

15
95

12

Ø20

Collar(Model: GY/W-C15)

AH Series

Fixed End0

17 -0.25

0Ø14.3 -0.11

0Ø15 -0.018

Supported End

55

20
75

Applicable Support Units
Applicable supported end support units

Applicable fixed end support units

BUK-15S (square) Refer to page 22

BUK-15F (square) Refer to page 22

BUM-15S (round) Refer to page 23

BUM-15F (round) Refer to page 23

Optional Specifications
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available.

19

Screw Shaft Nominal Diameter φ25 

AH Series

Ball Screw Specifications
Nominal Model

AH25054S

AH25103S

AH25252S

Nominal Diameter [mm] - Lead [mm]25 - 525 - 1025 - 25

Number of Circuits / Thread Direction

3.7 turns per row / Right

2.7 turns per row / Right

1.7 turns per row / Right

Ball Diameter [mm]

3.175

3.175

3.175

Root Diameter [mm]

22.5

22.5

22.5

Basic Dynamic Load Rating C [N]

12,700

9,700

6,300

Basic Static Load Rating C0 [N]

25,70018,80011,800Accuracy Grade

C5

C5

C5

F / 0.005 or lessS / 0 (Preloaded)

F / 0.005 or lessS / 0 (Preloaded)

F / 0.005 or lessS / 0 (Preloaded)

Ball Re-Circulation System

Side DeflectorTM method

Side DeflectorTM method

Side DeflectorTM method

Wiper / Lubrication Unit

LUBSEALTM

LUBSEALTM

LUBSEALTM

Multemp LRL No.3

Multemp LRL No.3

Multemp LRL No.3

5,000
DN ≤ 150,000

5,000
DN ≤ 150,000

5,000
DN ≤ 150,000

Clearance Symbol / Axial Clearance [mm]Lubricant-1

Maximum Rotational Speed [min ]6-M drilled

Lt
Lf

LUBSEAL both ends

45°
22.5°

T
5

M6 x 1A(Oil Hole)

ØD1

(Ød)

B2

45°

ØD g6

-0.2

ØD -0.3

PCD

X
A

480 (Hardened portion)
730 (Hardened portion)
960 (Hardened portion)
1,460 (Hardened portion)

NominalModel

NominalDiameter

Lead
Ph

25

10

AH25054S
AH25103S

Nut Dimensions
Screw Shaft
Diameter Outer Diameter Flange Diameter Total Length Thickness Body Length Length Mounting Hole Mounting Hole Diameter Width
d
D
D1
Lt
T
Lf
B2
PCD
M
X

5

AH25252S

47
25

40

62

57

25

37
10

47

76

10

51

6.6

48

66

Guide to Model Numbers
AH25252S-

HS

Nominal Model
AH25054S
AH25103S
AH25252S

20

S

R

-

1460

X

Type of Wiper
S: LUBSEAL

1342

-

C5

Thread Length
Unit: mm
Overall Screw
Shaft Length
Unit: mmF
Clearance Symbol
F : 0.005 mm or less
S : 0 (Preloaded)
Lead Accuracy

Shaft End Design
Recommended shaft end configurations are available by size for AH Series ball screws.
As well as our recommended shaft end configuration below, additional machining for keyways, tap holes, D-cut machining, etc. are also available uponrequest. A sample machined shaft end configuration is shown below.
Model example: Shaft end not machined (left page)
AH25252S-HSSR-1460A

Shaft end machined
AH25252S-HSSR- 1460 X 1342 -C5F
Thread Length
Overall Screw Shaft Length

R0.3 or less

1.35

(1)

+0.1
0

0

M20 x 1

16

20
12 5

18

Ø15 -0.018

0

+0.14
0

15.35

Ø20 -0.021

Collar(Model: GY/W-C20)

AH Series

Fixed End0

22 -0.35

Ø25

0

Ø19 -0.21

0Ø20 -0.021

Supported End

73

27
100

Applicable Support Units
Applicable supported end support units

Applicable fixed end support units

BUK-20S (square) Refer to page 22

BUK-20F (square) Refer to page 22

BUM-20S (round) Refer to page 23

BUM-20F (round) Refer to page 23

Optional Specifications
Anti-rust black oxide film treatment (film thickness 1-2 μm) is available.

21

Compatible Support Units
Square Support Units/BUK Series
Fixed End Support Units
N

ØY

ØX

Z

ØDs

Øds

Spacer

E

F

Ls

Ød1

W

A

M

0

L/2

C -0.03
T

Q

L

B

J

K

Q

P
Supported for BUK-20F only

(unit: mm)

Model Number Ød1

A

B

C

T

E

£F

J

K

L

N

P

Q

W

X

Y

Z

M

Øds

ØDs

Ls

Weight (kg)

6

-

-

52

9

14

11

M10 x 1

10

14

5.5

0.49

BUK-10F

10

70

43

25

35

35.5

17

30

5.5

24

BUK-15F

15

80

50

30

40

41

22

31

12

25

5

-

-

60

11

17

15

M15 x 1

15

20

10

0.65

BUK-20F

20

95

58

30

45

56

30

52

10

42

10

22

10

75

11

17

15

M20 x 1

20

25

11

1.48

(Note 1) The weight above does not include packaging.

Supported End Support Units
ØX

Z

A

W

E

ØD

ØY

H

Ød2

Combination with Fixed End
Model Number0
C-0.03

T

R/2

B

R

Model Number

BUK-10F

BUK- 8S

BUK-15F

BUK-15S

BUK-20F

BUK-20S(unit: mm)

Model Number

Ød2

ØD

H

R

A

B

C

T

E

W

X

Y

Z

Shaft Stop Ring

Weight (kg)

BUK-8S

8

22

7

20

70

43

25

35

35.5

52

9

14

11

Nominal 8

0.37

BUK-15S

15

32

9

20

80

50

30

40

41

60

11

17

15

Nominal 15

0.46

BUK-20S

20

47

14

26

95

58

30

45

56

75

11

17

15

Nominal 20

0.76(Note 1) The weight above does not include packaging.

22Compatible Support Units
Round Support Units/BUM Series
Fixed End Support Units

Mounting Example_2

Mounting Example_1
L
K
U

Z

Spacer

H

N

E

H

J

(unit: mm)

Model Number Ød1

£A

ØC

ØD1

E

F

H

J

K

L

N

P

Q

£U

ØW

X

Y

Z

M

Øds ØDs

Ls

Weight (kg)BUM-10F

10

42

52

34

29

5.5

16

13

5

11

8.5

8

5

17

42

4.5

8

6

M10 x 1

10

14

5.5

0.24

BUM-15F

15

52

63

40

32

12

17

15

6

11

14

8

7

22

50

5.5

9.5

6

M15 x 1

15

20

10

0.40

BUM-20F

20

68

85

57

52

10

30

22

10

20

14

14

8

30

70

6.6

11

10

M20 x 1

20

25

11

1.09

(Note 1) The weight above does not include packaging.

Compatible Support Units

J

F

A

Øds
Ls

M

A/2

ØDs

ØD1g6

Ød1
A/2

P

ØY

ØW

ØC

Q

ØX

45°

45°

ØX

Supported End Support Units

ØD

Ød2

ØW

ØC

ØD2h9

ØY

Z

Combination with Fixed End

H

A/2

A/2

J1

Model Number

Model Number

BUM-10F

BUM- 8S

BUM-15F

BUM-15S

BUM-20F

BUM-20S

H1
E1

A(unit: mm)

Model Number

Ød2

ØD

H

£A

ØC

Ød2

E1

J1

H1

ØW

X

Y

Z

Shaft Stop Ring

Weight (kg)

BUM-8S

8

22

7

42

52

34

13

8

5

42

4.5

8

6

Nominal 8

0.11

BUM-15S

15

32

9

52

63

40

17

9

8

50

5.5

9.5

6

Nominal 15

0.17

BUM-20S

20

47

14

68

85

57

20

11

9

70

6.6

11

10

Nominal 20

0.38(Note 1) The weight above does not include packaging.

23

Low Particle Generating Grease
KURODA S-Grease
Meeting particle prevention needs for linear motion products used in semiconductor manufacturing machines, LCD-related equipment,
medical-related devices and more. Superior lubrication characteristics provide excellent torque performance.

Major Characteristics
Appearance

Yellow-whiteThickener

Urea

Base OilMineral oil

Consistency

280 (No. 2)

Operating Temperature Range-20 to +150°C

Low Particle Generation
Delivers superior low particle generation performance compared with standard lithium-based grease.
10,000Particle Quantity (#/CF)

Test conditions
Standard lithium-based grease

7,500

Screw Shaft Diameter

φ20 mm

Lead

20 mm

Axial Load

800 N

5,000
2,500
0

KURODA S-Grease

0

200
400
600
800
1,000
Screw Shaft Rotational Speed (min-1)

1,200

Lubrication Characteristics:

Torque Characteristics:

Comparison of Torque Change Before and After Operation

Comparison with Competitors’ Grease with Low Particle Generation

Test conditions
Screw Shaft Diameter

Test conditions
φ20 mmScrew Shaft Diameter

Lead

20 mm

Lead

2 mm

Preload Torque

30 N·cmOperating Stroke

0.5 mmTorque (N·cm)

60
40

Before operation
After 1,000 km ofoperation

20
0

-20
-40
-60
0

100 200(Out)

300

200 100(Back)
Unit (mm)0Delivers stable torque characteristics even during oscillating operation.
Torque ratio versus no grease applied

There is hardly any change in torque even after 1,000 km of operation.

500%

Grease D

400%
300%
200%

Grease A

Grease B

100%0%

No grease applied200

Anti-rust Performance
Delivers top anti-rust characteristics during bearing anti-rust testing (48 hours at 52°C).
* “Top” here indicates a complete absence of rust under the test conditions described above.

24

φ16 mmKURODA S-Grease

400
600
800
Cycles (times)

1,000Proper usage for safety
Be sure to read the following instructions before use.
For general instructions, refer to the text of this catalog.
The following safety precautions recommend the correct usage of our products to prevent injury or damage.
These precautions are classified into 3 categories: "DANGER", "WARNING", and "CAUTION" according to the degree of possible injury
or damage and the degree of impendence of such injury or damage. Be sure to follow all these precautions, as they contain importantmatters regarding safety.

DANGERWARNING

Indicates an impending hazardous

Indicates a potentially hazardous

situation that may arise due tosituation that may arise due toimproper handling or operation andimproper handling or operation andcould result in a serious injury or death.

could result in a serious injury or death.

CAUTION
Indicates a potentially hazardous
situation that may arise due toimproper handling or operation andcould result in an injury or property
damage only.

Be sure to obey the Industrial Safety Health Act and other safety rules and regulations in addition to these precautions.
There are some situations that may lead to serious results according to circumstances, even if covered under "CAUTION".
Be sure to follow these precautions, as they contain important matters.

WARNING
Select a ball screw properly.
As operating conditions for products mentioned in this catalog are diverse, the applicability of the ball screw to the intended
system should be determined by the overall system designer or the person who determined the system specifications after
conducting analysis and testing as necessary.
The person who determined the applicability of the system shall be responsible for ensuring the intended system's
performance and safety. When configuring the system, the system designer should thoroughly examine all system
specifications with reference to the latest product catalog and data, and also take into consideration the possibility ofequipment-related issues.
The ball screw should be handled by persons who have sufficient knowledge and experience.
· Thoroughly read this catalog and operation manual before use.
· Never disassemble the ball screw. Dust may enter, degrading the accuracy of the ball screw and leading to an accident.
When the ball screw must be disassembled, return it afterward to KURODA for repair and reassembling. (Fees will be
incurred.)· When mounting the ball screw to a machine and dismounting it from the machine, check that a means of fall prevention has
been put in place and that the machine moving parts have been fixed beforehand.
The products listed here are primarily for industrial use. When using the ball screw in the following conditions orenvironments, take the proper safety measures and consult KURODA beforehand.
· Conditions and environments other than specified, and outdoor use.
· Application to nuclear power equipment, railroads, aircraft, vehicles, medical equipment, equipment contacting food anddrink, and the like.
· Applications which require extreme safety and will also greatly affect persons and property.
During operation, make sure to keep your hands away from threaded sections and ends of ball screw shafts, which
are rotating parts, to prevent your hands from being caught.
Pay adequate attention not to allow the products to be used for military purposes, including for arms and weapons.

25Ball screw/General instructions (1)Be sure to read the following instructions before use.
Also refer to "Proper usage for safety".
Cautions for design

Cautions for mounting and use

WARNINGWARNING

Rotational speed
Referring to the section describing allowable rotational speed
in this catalog, use the ball screw at or lower than the listed
allowable rotational speed. Using the product at or above thespecified DN value could cause damage of its recirculation
components and result in inoperable conditions. When using a
vertical shaft, the damage may lead to dangerous accidents
such as falling balls or parts.

CAUTION
Dust preventive cover
If it is likely that dust or other contaminant may enter the ballscrew, be sure to attach a dust preventive cover, such as
bellows or lead screw cover (steel bellows). Attaching a wiper
at both ends of the nut will be more effective for dust
prevention.
Dust or contaminant caught in the ball screw could cause
various defects including malfunction, abnormal noise,
excessive vibration, accelerated wear-out, and prematurechipping.
Dust preventive device
Lead screw cover

Do not overrun the product.
If the ball screw nut is overrun and receives an impact at thestroke end, the resulting thread groove impressions could
cause malfunction. If the thread groove end has a part with anincomplete thread, this could damage ball recirculation
components, which may result in inoperable conditions.
If a ball screw nut has been allowed to overrun, please contact
KURODA. Return the product to KURODA for repair. (Fees will
be incurred.)
Pay adequate attention to the accuracy grade.
Moment load caused by misalignment of the ball screw,
bearing, guide, nut, or housing and improper angularity may
result in malfunction, abnormal noise, excessive vibration,shorter product service life as well as breakage of screw shafts
due to rotating bending fatigue. Be careful of thesemalfunctions, which may lead to a serious accident.
Be careful to prevent parts from falling due to their own weight.
Since the ball screw has a low friction factor, its shaft or nut
could potentially fall off due to its own weight. Be careful not tosnag your hand or fingers in components.
Do not touch the ball screw with bare hands.
The screw shaft and nut corners may have sharp edges forstructural reasons, and there may be a risk of injuries such as
cuts.
In order to prevent injuries, take adequate care when handling
products and wear protective equipment such as gloves
during work.

CAUTION
Bellows

Wiper

Felt wiper

Resin wiper, lip seal,
brush wiper

Imbalanced load
In your system design, ensure that a radial or moment load is
not directly applied to the ball screw.
Otherwise, it may result in shorter product service life due toconcentrated load to a certain portion of balls in the screw.
Mounting of the ball screw
When mounting the ball screw to a machine, the systemdesign should allow its screw shaft to be mounted without
taking off the nut.
Removing and attaching the nut may cause some balls to drop
outside of their recirculation path, which may result in damageof recirculation components. If removal of the nut is inevitable,
consult KURODA beforehand.

26

Do not remove the nut.
If the ball has fallen from the nut or the shaft and the nut havebeen separated, do not attempt to reassemble them yourself.
Return the product to KURODA for repair. (Fees will be
incurred.)
Be careful of any dust or contaminants.
While assembling the machine, put on a cover to prevent thescrew shaft from attracting any dust or contaminants. These
contaminants could cause malfunction of the machine.
When a component such as bearing, gear, or pulley is
attached to the screw shaft, handle them with care so that
there is no damage from impact. This impact could cause thescrew shaft to bend.
If an impact is accidentally applied to the shaft, check whether
it is bent first by checking the coupling of the screw shaft witha dial gauge, before assembling the additional components.
Use the product within the operating temperature limit.
Ball screws are designed to have a normal operating
temperature limit of 50°C or below. Using them in anenvironment exceeding the operating temperature limit may
result in damaged lubrication or sealing components.
If you need to use the screw in a special environment, consult
with KURODA beforehand.

Ball screw/General instructions (2)Be sure to read the following instructions before use.
Also refer to "Proper usage for safety".
Lubricants

CAUTION
Type of lubricant
Unless specified, lithium-based grease is contained in the nut
as lubricant. Since anti-rust oil applied to the screw shaft also
serves as lubricant, the ball screw can be used without
additional application.

Storage

CAUTION
Storage method
Store the ball screws indoors with as little temperature
difference as possible, avoiding high and low temperaturesand high humidity.
Store in a horizontal state in the packaging originally sent by
KURODA. In order to prevent unnecessary contamination due
to dust or rusting of the ball screws, do not open the outer
packaging or any of the internal packaging unless necessary.

Checkup and caution

CAUTION
Checking the lubricant status and application of grease
For the sake of usability and dust/contaminant prevention,
lubricant for ball screws is, in general, contained only in thenut. When specified or required for overseas export, lubricant
may be applied to the screw shaft.
Depending on the screw size and screw shaft length, theamount of grease in the nut may not be sufficient. After running
the nut back and forth the length of the shaft, check to see if
the rolling side of the thread groove has enough grease on it. If
the amount is not enough, apply additional grease to thescrew shaft.
Checkup and reapplication of lubricant
Check the lubricant 2 to 3 months after the ball screw is used
for the first time. If it is extremely dirty, it is recommended thatyou wipe off old grease and apply new grease. After that,check and supply the lubricant once every year as a general
rule. However, as the service life of lubricants varies according
to operating conditions and environment, adjust the intervals
properly.

When reapplying additional lubricant, use the same brand of
lubricant as was initially included.
For a ball screw model provided with a nut which does not havean oil hole, supply a sufficient amount of grease directly to thescrew shaft and thread groove, carefully applying it over thecomponents until the grease goes into the nut.
For a model provided with a nut having an oil hole, supply thenecessary amount of grease from the oil hole or a feeder (grease
fitting, etc.).
After applying additional grease, operate for a full stroke toensure the proper coverage of the grease on all components.
Wipe off excess grease attached on the end of the screw shaft.
For more details on the size of the oil hole, refer to thedimensions for each size.

27

CAT.NO.KB1014-03

https://www.kuroda-precision.com/
HEAD OFFICE

580-16, Horikawa-cho, Saiwai-ku, Kawasaki, Kanagawa 212-8560, Japan
Tel: +81-(0)44-555-3805 Fax: +81-(0)44-555-1479
Email: ovs_dpt@kuroda-precision.co.jp
KURODA JENA TEC INC.
3939 Royal Drive Suite 143 Kennesaw, GA 30144 U.S.A.
Tel: 1-770-926-6705 Fax: 1-770-926-6724
Email: sales@kurodajenatec.com
JENAER GEWINDETECHNIK GmbH
Göschwitzer Str. 39, 07745 Jena, Germany
Tel: +49-(0)3641-68980 Fax: +49-(0)3641-689860
Email: info@jena-tec.de
KURODA PRECISION INDUSTRIES KOREA LTD.
202F 110, Ls-Ro 144 Beon-Gil, Dongan-gu,
Anyang-si, Gyeonggi-do, 14083, Korea
Tel: +82-31-451-4920 Fax: +82-31-451-4921
Email: mail@kuroda.kr
KURODA JENA TEC TRADING PINGHU CO., LTD.
383, Xingye Road, Pinghu Economic Development Zone, Pinghu Zhejiang,
P.R. China, P.C: 314200
Tel: +86-573-85010786 Fax: +86-573-85014123
Email: kpp@kuroda-pinghu.com

Internet Support Service

https://www.kuroda-precision.com/

KURODA provides product information and CAD data
online which can be downloaded.
In addition, please note that you need to register on
the PART community to use 3D-CAD data.

* The contents herein are information as of the end of Aug. 2022.
The appearance or specifications of products may be changed without
prior notice in order to respond to technical progress and improvements.

Printed in Japan 2022.09(A)