Ball Spline Series - THK

Ball Spline SeriesOptimal for mechanisms that perform linear motion while transmitting a torqueCapable of high-speed motion and high-speed rotationA wide array of lineups

CATALOG No.381-3E

ContentsBall Spline Series

1. Structure and Features …… P. 2

2. Classification ……………… P. 3

3. Conditions and Guidelines for

Selecting of a Preload …… P. 5

4. Accuracy …………………… P. 7

5. Dimensional Tables

Model LT ………… P. 9

Model LF ………… P.11

Model LBS………… P.13

Model LBST ……… P.15

Model LBF………… P.16

Model LBR………… P.17

Model LBH………… P.18

Model LTR-A……… P.19

Model LTR ……… P.21

LT

P.9

LBS

P.13

LBF

P.16

LBR

P.17

LBH

P.18

LBST

P.15

LF

P.11

Medium-torque Type

High-torque Type

Rotary Type

LTR-A

P.19

LTR

P.21

LBG LBGT

See the GeneralCatalog.

See the GeneralCatalog.

1

2

Ball Spline Series

Spline shaft

Spline nut

Ball

Retainer

Seal

Snap ring

Model LBS

Structure of Ball Spline Models LBS and LT

Model LT

Spline nut

Ball

Retainer

Seal

Spline shaft

Snap ring

The Ball Spline is an innovative linear motion system in which balls accommodated in the spline nut transmittorque while linearly moving on precision-ground raceways on the spline shaft.Unlike the conventional structure, a single spline nut can provide a preload with THK

,s Ball Spline. As a

result, the Ball Spline demonstrates high performance in environments subject to vibrations and impactloads, locations where a high level of positioning accuracy is required or areas where high-speedkinetic performance is required.In addition, even when used as an alternative to a linear bushing, the Ball Spline achieves a rated load morethan 10 times greater than the linear bushing with the same shaft diameter, allowing it to compactly bedesigned and used in locations where an overhung load or a moment load is applied.Thus, the Ball Spline provides a high degree of safety and long service life.

Structure and Features

There are three types of the Ball Spline: medium-torque type, high-torque type and rotary type. You canchoose a type according to the intended use. In addition, wide arrays of spline nut shapes are availablefor each type, enabling the user to choose a desired shape according to the mounting or servicerequirements.

Classification of Ball Splines

Classification Type Shape Shaft diameter

Nominal shaft diameter:6 to 150 mm








Hig

h-to

rque

type

Med

ium

-tor

que

type

Rot

ary

type

Model LBSModel LBST

Model LBF

Model LBR

Model LBH

Model LT

Model LF

Model LTR-AModel LTR

Model LBGModel LBGT

Rotation

Rotation

3

● Column and arm of industrial robot

● Automatic loader

● Transfer machine

● Automatic conveyance system

● Tire molding machine

● Spindle of spot-welding machine

● Guide shaft of high-speed automatic coating machine

●Riveting machine

●Wire winder

●Work head of electric discharge machine

● Spindle drive shaft of grinding machine

● Speed gears

● Precision indexing shaft

●Shaft for die setting and similarapplications requiring linearmotion under a heavy load.

● Loading system and similarapplications requiring rotationto a given angle at a fixedposition.

●Automatic gas-welding machinespindle and similar applicationsrequiring a whirl-stop on oneshaft.

● Column and arm ofindustrial robot

● Spot-welding machine

●Riveting machine

● Book-binding machine

● Automatic filler

● XY recorders

● Automatic spinner

● Optical measuringinstrument

● Z axis of scalar robot

● Wire winder

● Speed gears for high-torque transmission

● A unit type that has the same contact structure as modelLBS. The flange circumference on the spline nut ismachined to have gear teeth, and radial and thrust needlebearings are compactly combined on the circumference ofthe spline nut.

● A lightweight, compact type based on model LT, but has aspline nut circumference machined to have angular-contacttype ball raceways to accommodate support bearings.

● The spline shaft has two to three crests. On both sides ofeach crest, two rows (four to six rows in total) of balls arearranged to hold the crest from both sides. This design allowsan appropriate preload to be evenly applied.

● The contact angle of 20° and an appropriate preload leveleliminate angular backlash, providing high-torque momentrigidity.

● The spline shaft has three crests equidistantly formed atangles of 120°. On both sides of each crest, two rows (sixrows in total) of balls are arranged to hold the crest fromboth sides. The angular-contact design of the ball contactareas allows an appropriate preload to be evenly applied.

● Since the balls circulate inside the spline nut, the outerdimensions of the spline nut are compactly designed.

● Even under a large preload, smooth linear motion isachieved.

● Since the contact angle is large (45°) and the displacementis minimal, high rigidity is achieved.

● No angular backlash occurs.

● Capable of transmitting a large torque.

Structure and features Major applications

4

5

Table 1 provides guidelines for selecting a clearance in the rotational direction with given conditions ofthe Ball Spline.The rotational clearance of the Ball Spline significantly affects the accuracy and rigidity of the splinenut. Therefore, it is essential to select a correct clearance according to the intended use. Generally, theBall Spline is provided with a preload. When it is used in repeated circular motion or reciprocatingstraight motion, the Ball Spline is subject to a large vibration impact, and therefore, its service life andaccuracy are significantly increased with a preload.

Conditions and Guidelines for Selecting of a Preload

Table 1 Guidelines for Selecting a Clearance in the Rotational Direction for the Ball Spline

Fig. 1 Comparison between LBS and LT for Zero Clearance Fig. 2 Comparison between LBS and LT for Clearance CL

●High rigidity is required and vibration impact is present.●Receives a moment load with a single spline nut.

●An overhung load or moment is present.●High positioning accuracy is required.●Alternating load is applied.

●Smooth motion with a small force is desired.●A torque is always applied in the same direction.

Clearance in rotational direction

Light preload(CL)

Normal grade(No symbol)

Medium preload(CM)

Service conditions Example of application

Steering shaft of construction vehicle; shaft of spot-welding machine; indexing shaft of automatic lathe tool rest

Industrial robot arm; automatic loaders; guide shaft of automatic coating machine; main shaft of electric discharge machine; guide shaft for press die setting; main shaft of drilling machine

Measuring instruments; automatic drafting machine; geometrical measuring equipment; dynamometer; wire winder; automatic welding machine; main shaft of horning machine; automatic packing machine

Rot

atio

nal a

ngle（

tanθ）

Torque（N-m）

125 150

LT30

LBS30

100

40

30

20

10

00 25 50 75

〔x10 〕-4

125 150

LT30

LBS30

100

40

30

20

10

00 25 50 75

Rot

atio

nal a

ngle（

tanθ）

Torque（N-m）

〔x10 〕-4

6

Table 3 Clearance in the Rotational Direction for Models LBS, LBF, LBST, LBR and LBH

Symbol Normal Light preload Medium preload

Nominal shaft diameter No symbol CL CM

Unit: μm

6 8

10 15

20 25 30

40 50 60

70 85

100 120

150

– 2 to +1

– 3 to +2

– 4 to +2

– 6 to +3

– 8 to +4

–10 to +5

–15 to +7

– 6 to – 2

– 9 to – 3

–12 to – 4

–18 to – 6

–24 to – 8

–30 to –10

–40 to –15

—

–15 to – 9

–20 to –12

–30 to –18

–40 to –24

–50 to –30

–70 to –40

Table 2 Clearance in the Rotational Direction for Models LT and LF



Unit: μm

4 5 6 8 10 13

16 20

25 30

40 50

60 80

100

– 2 to +1

– 2 to +1

– 3 to +2

– 4 to +2

– 5 to +2

– 6 to +3

– 6 to – 2

– 6 to – 2

–10 to – 4

–16 to – 8

–22 to –12

–26 to –14

—

– 9 to – 5

–14 to – 8

–22 to –14

–30 to –20

–36 to –24

Table 4 Clearance in the Rotational Direction for Model LTR



Unit: μm

8 10

16 20

25 32

40 50

60

– 2 to +1

– 2 to +1

– 3 to +2

– 4 to +2

– 5 to +2

– 6 to – 2

– 6 to – 2

–10 to – 4

–16 to – 8

–22 to –12

—

– 9 to – 5

–14 to – 8

–22 to –14

–30 to –20

7

The accuracy of the Ball Spline is classified into three grades: normal grade (no symbol), high grade (H)and precision grade (P), according to the run-out of spline nut circumference in relation to the supportof the spline shaft. Fig. 3 shows the measurement items.

Accuracy Standards

Fig.3 Accuracy Measurement Items for the Ball Spline

Table 7

Part-mounting section Part-mounting section

Spline section

Spline nut

Table 6

AA

A

Table 8

Table 5

AB

Table 6 B

Table 7 BB

AB

Support section Support section

Table 5 Run-out of the Spline Nut Circumference in relation to the Support Section of the Spline ShaftUnit: μm

Above

—

200

315

400

500

630

800

1000

1250

1600

2000

2500

Or less

200

315

400

500

630

800

1000

1250

1600

2000

2500

3000

Normal

72

133

—

—

—

—

—

—

—

—

—

—

Normal

59

83

103

123

—

—

—

—

—

—

—

—

Normal

56

71

83

95

112

—

—

—

—

—

—

—

Normal

53

58

70

78

88

103

124

—

—

—

—

—

Normal

53

58

63

68

74

84

97

114

139

—

—

—

Normal

51

55

58

61

65

71

79

90

106

128

156

—

Normal

51

53

55

57

60

64

69

76

86

99

117

143

Normal

—

—

—

46

49

53

58

63

80

100

125

150

High

46

（89）—

—

—

—

—

—

—

—

—

—

High

36

54

68

—

—

—

—

—

—

—

—

—

High

34

45

53

62

—

—

—

—

—

—

—

—

High

32

39

44

50

57

68

83

—

—

—

—

—

High

32

36

39

43

47

54

63

76

93

—

—

—

High

30

34

36

38

41

45

51

59

70

86

—

—

High

30

32

34

35

37

40

43

48

55

65

78

96

High

—

—

—

36

39

43

48

55

65

80

100

129

Precision

26

—

—

—

—

—

—

—

—

—

—

—

Precision

20

32

—

—

—

—

—

—

—

—

—

—

Precision

18

25

31

38

—

—

—

—

—

—

—

—

Precision

18

21

25

29

34

42

—

—

—

—

—

—

Precision

16

19

21

24

27

32

38

47

—

—

—

—

Precision

16

17

19

21

23

26

30

35

43

54

—

—

Precision

16

17

17

19

20

22

24

28

33

40

49

61

Precision

—

—

—

19

21

24

27

32

40

50

68

84

Overall spline shaft length (mm)

AccuracyNominal shaft

diameter 4 to 8(See Note 1)

10 13 to 20 25 to 32 40、50 60 to 80 85 to 120 150

Run-out (MAX)

Note 1: The dimension in parentheses does not apply to a nominal shaft diameter of 4.

Note 2: Applicable to models LBS, LBST, LBF, LBR, LT and LF.

Table 6 Perpendicularity of the Spline Section’s End Face to the Support Section of the Spline Shaft

Accuracy Perpendicularity (MAX)

Nominal shaft diameter Normal grade (No symbol) High grade (H) Precision grade (P)

Unit: μm

4 5 6 8 10

13 15 16 20

25 30 32

40 50

60 70 80

85 100 120

150

22

27

33

39

46

54

63

9

11

13

16

19

22

25

6

8

9

11

13

15

18

8

Note: Except models LBG, LBGT, LTR and LTR-A.

Note 1: The lengths in the table each represent the overall shaft length.

Note 2: For the standard hollow shaft type“K,”the values in the table apply.

Note 3: For the standard hollow shaft type“N,”the maximum lengths for the normal and high grades are limited to that of the precision grade (P).

Table 7 Concentricity of the Part-mounting Section in Relation to the Support Section of the Spline Shaft

Accuracy Concentricity (MAX)


Unit: μm

4 5 6 8

10

13 15 16 20

25 30 32

40 50

60 70 80

85 100 120

150

33

41

46

53

62

73

86

100

14

17

19

22

25

29

34

40

8

10

12

13

15

17

20

23

Table 8 Perpendicularity of the Spline Nut’s Flange Mounting Surface to the Support Section of the Spline Shaft

Accuracy Perpendicularity (MAX)


Unit: μm

6 8

10 13

15 16 20 25 30

40 50

60 70 80 85

100

27

33

39

46

54

63

11

13

16

19

22

25

8

9

11

13

15

18

Tables 9 and 10 show the maximum manufacturing lengths of the ball spline shafts by accuracy.

Maximum Manufacturing Length by Accuracy

Table 9 Maximum Manufacturing Length of ModelsLBS, LBST, LBF, LBR and LBH by Accuracy

Table 10 Maximum Manufacturing Length of ModelsLT, LF, LTR and LTR-A by Accuracy

AccuracyModel No. Normal grade High grade Precision grade

(No Symbol) (H) (P)

Unit: mmUnit: mm

6

8

10

15

20

25

30

40

50

60

70

85

100

120

150

200

600

600

1800

1800

3000

3000

3000

3000

3800

3800

3800

4000

3000

3000

150

200

400

600

700

1400

1400

1400

1400

2500

2500

3000

3000

3000

3000

100

150

300

600

700

1400

1400

1400

1400

2000

2000

3000

3000

3000

3000

AccuracyModel No. Normal grade High grade Precision grade

(No Symbol) (H) (P)

4

5

6

8

10

13

16

20

25

30

40

50

60

80

100

600

600

600

1000

1000

1000

2000

2000

3000

3000

3000

3000

4000

4000

4000

200

315

400

500

630

800

1000

1500

1500

1600

2000

2000

2000

2000

3000

200

200

315

400

500

630

1000

1000

1000

1250

1520

1500

2000

2000

3000

0–0.025

9

Model LTDimensional Table for Model LT

2-φd0 3-φd0

b b

t t

Model LT13 or smaller Model LT16 or larger

22.52.52.5333.544468

121620

1.21.21.21.21.51.522.52.52.53.54567

68

10.510.5131517.529364252586776

110

0.50.50.50.50.50.50.50.50.50.50.51122.5

——11.51.51.5223344555

16202525333650637180

100125140160185

(See Note 1)LT 4(See Note 1)LT 5

LT 6LT 8LT 10LT 13

○ LT 16○ LT 20○ LT 25○ LT 30○ LT 40○ LT 50○ LT 60○ LT 80○ LT 100

Model No.

Spline nut dimensions

Outer diameter

D Tolerance

10121416212431354247648090

120150

0–0.011

0–0.013

0–0.016

0–0.0190

–0.022

Length

L Tolerance

0–0.2

0–0.3

0–0.4

0–0.009

bH8

Keyway dimensionsGreasing

hole

t+0.05

0R0 r d0

Note 1: Models LT4 and 5 do not use a retainer. Do not remove the shaft from the spline nut (doing so will cause balls to fall off).Note 2: ○: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available.

(Example) LT20 A CL＋500L HSymbol for high-temperature type

2 LT30 UU CL +500L H KModel

numberSymbol for clearancein the rotationaldirection (see page 6)

Accuracy symbol(see page 7)

Symbol for standard hollow splineshaft (no symbol: solid spline shaft)Overall spline shaft

length (in mm)Number of splinenuts on one shaft(no symbol for onespline nut)

Dust prevention accessory symbol No symbol: without sealUU: rubber seal attached on both ends of spline nut U: rubber seal attached on either end of spline nut

Example of model number coding

10

R0

L

r

r

φD0φD

CT

[N-m]

Basic torque rating

No. of rows of balls

Spline shaft diameter

C0T

[N-m]

Basic load rating

C[kN]

C0

[kN]

Static permissible moment

MA.1(See Note 3)

[N-m]MA.2

(See Note 3)

[N-m]

Mass

Spline nut[g]

Spline shaft[kg/m]

0.590.880.981.963.925.88

31.456.9

105171419842

122023103730

444444666666666

D0

h7

4568

10131620253040506080

100

0.781.371.962.947.84

10.834.355.9

103148377769

104019203010

0.440.661.181.472.843.537.06

10.215.220.537.860.973.5

104.9136.2

0.610.882.162.554.95.78

12.617.825.83460.594.5

111.7154.8195

0.881.5 4.9 5.9

15.719.667.6

118210290687

1340160025103400

6.411.636.344.198

138393700

11401710376073509990

1600024000

5.29.1

17185055

165225335375

10001950250046809550

0.10.150.230.40.621.11.62.53.95.69.9

15.522.339.661.8

Unit: mm

Note 3: MA.1 indicates the permissible moment value in the axial direction when one spline nut is used.MA.2 indicates the permissible moment value in the axial direction when two spline nuts are used.(Using a single LT unit is not stable in accuracy. We recommend using two units in close contact with each other.)

Note 4: For details on the maximum lengths of ball spline shafts by accuracy, please see page 8.

11

Model LFDimensional Table for Model LF

2-φd0

3-φd0

4-φd1 drilled through, φd2 counter bore depth h 4-φd1 drilled through, φd2 counter bore depth h

PCD

PCD

45°45° 45°45°

Model LF13 or smaller Model LF16 or larger

Note 1: ○:For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available.(Example) LF30 A CL＋700L H

Symbol for high-temperature type

5567799

101416

LF 6LF 8LF 10LF 13

○ LF 16○ LF 20○ LF 25○ LF 30○ LF 40○ LF 50

Model No.


Outer diameter Length Flange diameter

D L D1Tolerance Tolerance Tolerance

14162124313542476480

2525333650637180

100125

3032424451586575

100124

0–0.011

0–0.013

0–0.016

0–0.019

0–0.2

0–0.3

0–0.2

H

7.57.5

10.5111822.526.5303646.5

0.50.50.50.50.50.50.50.511

0.50.50.50.50.50.50.50.50.51

1.51.51.51.5223344

222432334045526082

102

3.4×6.5×3.33.4×6.5×3.34.5×8×4.44.5×8×4.44.5×8×4.4

5.5×9.5×5.45.5×9.5×5.46.6×11×6.59×14×8.6

11×17.5×11

F C r d0 PCD d1×d2×h

Greasinghole

Mounting hole

2 LF20 UU CM +400L P NModel





Dust prevention accessory symbol No symbol: without sealUU: rubber seal attached on both ends of spline nut U: rubber seal attached on either end of spline nut


12

φD1

L

φD0 φD

C

C

r

FH

Mass

Spline nut[g]

Spline shaft[kg/m]

Unit: mm

CT

[N-m]

Basic torque rating

No. of rows of balls

Spline shaft diameter

C0T

[N-m]

Basic load rating

C[kN]

C0

[kN]


MA.1(See Note 2)

[N-m]MA.2

(See Note 2)

[N-m]

0.981.963.925.88

31.456.9

105171419842

4444666666

D0

h7

68

1013162025304050

1.962.947.84

10.834.355.9

103148377769

1.181.472.843.537.06

10.215.220.537.860.9

2.162.554.95.78

12.617.825.83460.594.5

4.95.9

15.719.667.6

118210290687

1340

36.344.198

138393700

1140171037607350

Note 2: MA.1 indicates the permissible moment value in the axial direction when one spline nut is used.MA.2 indicates the permissible moment value in the axial direction when two spline nuts are used.(Using a single LF unit is not stable in accuracy. We recommend using two units in close contact with each other.)


353790

110230330455565

14602760

0.230.40.621.11.62.53.95.69.9

15.5

13

Model LBSDimensional Table for Model LBS - Medium Load Type

L

L2

(Overall length with seal)

(Overall length without seal)L3

C

d5

b

C

φDφD2D0

R0

2-φd0

t

30°

L

CC

Cd5

b

C

φDD0

R0

2-φd0

t

30°

Models LBS6 and 8

Model LBS10

Model No.


(See Note 1)LBS 6(See Note 1)LBS 8

LBS 10LBS 15

○● LBS 20○● LBS 25○● LBS 30○● LBS 40○● LBS 50○● LBS 70○● LBS 85○● LBS100

Outer diameter

D Tolerance

121619233037456075

100120140

0–0.0110

–0.013

0–0.0190

–0.0220

–0.025

0–0.016

Length

L Tolerance

2025304050607090

100110140160

L2

20.826.4——————————

L3

1114.5——————————

D2

11.515.5——————————

bH8

Keyway dimensions

22.533.5457

1015182028

t+0.050

0.81.21.522.5344.55679

R0

1012.517202633415560688093

r

———0.50.50.5111.522.53

C

0.30.30.3—————————

0–0.2

0–0.3

0–0.4

Note 1: Models LBS6 and 8 are end cap types.With models LBS6 and 8, do not give a shock to the end cap.

Note 2: A high-temperature type is not available for miniature Ball Splines.○: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available.

(Example) LBS20 A CL＋500L HSymbol for high-temperature type

●: Those models can be attached with a felt seal.Ball Splines using metal retainers cannot be attached with a felt seal.

14

R0

L

r

φD

r

b

t3-φd0

Model LBS15 or larger

Spline shaft outer diameter Basic torque rating Basic load rating (radial)

Greasinghole

d0

1.21.21.5222334455

D0

68

10—————————

d5 CT

[N-m]

5.37.38.3—————————

1.534.077.02

30.474.5

154273599

1100219036205190

C0T

[N-m]

2.416.16

10.474.5

160307538

1140194038006360

12600

C[kN]

0.6371.181.624.47.8

1319.331.946.666.490.5

126

C0

[kN]

0.7851.421.968.4

14.923.533.853.473

102141237


MA.1(See Note 3)

[N-m]

2.25.18.1

25.460.2

118203387594895

20003460

MA.2(See Note 3)

[N-m]

19.439.667.6

185408760

1270264040506530

1260020600

Mass

Spline nut[kg]

0.00660.01540.03670.060.140.250.4411.73.15.59.5

Spline shaft[kg/m]

0.220.420.5511.82.73.86.8

10.621.33245

Unit: mm

2 LBS40 UU CL +1000L P KModel





Dust prevention accessory symbol No symbol: without seal UU: rubber seal attached on both ends of spline nutU: rubber seal attached on either end of spline nut DD: felt seal attached on both ends of spline nut D: felt seal attached on either end of spline nut


Note 3: MA.1 indicates the permissible moment value in the axial direction when one spline nut is used.MA.2 indicates the permissible moment value in the axial direction when two spline nuts are used.(Using a single LBS unit is not stable in accuracy. We recommend using a single LBST unit or two units of model LBS in closecontact with each other.)


15

Model LBSTDimensional Table for Model LBST – Heavy Load Type

R0

L

φD

r

r

b

t3-φd0

Model No.


○● LBST 20○● LBST 25○● LBST 30○● LBST 40○● LBST 50○ LBST 60○● LBST 70○● LBST 85○● LBST 100○ LBST 120○ LBST 150

Outer diameter

D Tolerance

303745607590

100120140160205

0–0.019

0–0.025

Length

L Tolerance

607080

100112127135155175200250

0–0.3

0–0.40

–0.50–0.029

0–0.016

0–0.2

0–0.022

bH8

Keyway dimensionsGreasing

hole

457

1015181820282832

t+0.05

0

2.5344.5566799

10

R0

263341556068688093

123157

r

0.50.5111.51.522.533.53.5

d0

22334445566

Basic torque rating

CT

[N-m]

90.2176312696

129018703000474064608380

13900

C0T

[N-m]

213381657

14202500383060909550

144001940032200

Basic load rating (radial)

C[kN]

9.414.922.537.155.166.290.8

119137148196

C0

[kN]

20.128.741.466.994.1

121164213271306405


MA.1(See Note 2)

[N-m]

103171295586941

130020803180441054908060

MA.2(See Note 2)

[N-m]

63210601740354056108280

1180017300254003240055400

Mass

Spline nut[kg]

0.170.290.51.11.93.33.86.1

10.412.928

Spline shaft[kg/m]

1.82.73.86.8

10.615.621.3324569.5

116.6

Unit: mm

Note 1: ○: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available.(Example) LBST25 A CM＋400L H

Symbol for high-temperature type●: Those models can be attached with a felt seal.

Ball Splines using metal retainers cannot be attached with a felt seal.

Model No.

○● LBST 20○● LBST 25○● LBST 30○● LBST 40○● LBST 50○ LBST 60○● LBST 70○● LBST 85○● LBST 100○ LBST 120○ LBST 150

Note 2: MA.1 indicates the permissible moment valuein the axial direction when one splinenut is used.

Note 2: MA.2 indicates the permissible moment valuein the axial direction when two splinenuts are used.

Note 3: For details on the maximum lengths of ballspline shafts by accuracy, please see page 8.

2 LBST50 UU CM +800L H KModel







16

Model LBFDimensional Table for Model LBF – Medium Load Type

L

φD1 φD

F

φd1

h

φd2

3-φd0

H

PCD

Note 1 :○: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available.(Example) LBF20 A CL＋500L H



Model No.


Outer diameter

D Tolerance

2330374557708595

115135

Length Flange diameter

L Tolerance D1 Tolerance

4050607090

100127110140160

0–0.2

0–0.3

0–0.4

4349607090

108124142168195

0–0.013

0–0.025

0–0.022

0–0.016

0–0.019

PCD

323847547086

102117138162

Basic torque ratingSpline nut dimensions

CT

[N-m]

30.474.5

154273599

11001870219036205910

C0T

[N-m]

74.5160307538

11401940383038006360

12600


C[kN]

4.47.8

1319.331.946.666.266.490.5

126

C0

[kN]

8.414.923.533.853.473

121102141237


MA.1(See Note 2)

[N-m]

25.460.2

118203387594

1300895

20003460

MA.2(See Note 2)

[N-m]

185408760

12702640405082806530

1260020600

Mass

Spline nut[kg]

0.110.20.360.61.21.93.53.66.2

11

Spline shaft[kg/m]

11.82.73.86.8

10.615.621.33245

Unit: mm

Greasinghole

d0

2 2 2 3 3 4 4 4 5 5

Mounting hole

d1×d2×h

4.5×8×4.44.5×8×4.4

5.5×9.5×5.46.6×11×6.59×14×8.6

11×17.5×1111×17.5×1114×20×13

16×23×15.218×26×17.5

F

13182125313445.5354855

H

779

10141618202225

LBF 15○● LBF 20○● LBF 25○● LBF 30○● LBF 40○● LBF 50○ LBF 60○● LBF 70○● LBF 85○● LBF 100

Model No.

LBF 15○● LBF 20○● LBF 25○● LBF 30○● LBF 40○● LBF 50○ LBF 60○● LBF 70○● LBF 85○● LBF 100

0–0.2

0–0.3

0–0.4

Note 2: MA.1 indicates the permissible momentvalue in the axial direction when onespline nut is used.

Note 4: MA.2 indicates the permissible momentvalue in the axial direction when twospline nuts are used.

(Using a single spline nut is not stable in accuracy.We recommend using two spline nuts in closecontact with each other.)Note 3: For details on the maximum lengths of ball

splineshaftsbyaccuracy,pleaseseepage8.

2 LBF20 DD CL +900L P KModel







17

Model LBRDimensional Table for Model LBR

L

φD1 φD3 φD

FE

φd1

3-φd0

H

PCD

Model No.


Outer diameter

D Tolerance

2530404560759095

120140

0–0.016

0–0.019

0–0.022

LengthFlange

diameter

L Tolerance D1

Outer diameter

D3

40607080

100112127135155175

0–0.2

0–0.3

0–0.4

45.456.470.475.496.4

112.4134.5140.6170.6198.6

25.3530.3540.3545.460.475.490.595.6

120.6140.60

–0.025

PCD

344454617894

112117146170


CT

[N-m]

30.490.2

176312696

12901870300047406460

C0T

[N-m]

74.5213381657

14202500383060909550

14400


C[kN]

4.49.4

14.922.537.155.166.290.8

119137

C0

[kN]

8.420.128.741.466.994.1

121164213271


MA.1(See Note 2)

[N-m]

25.4103171295586941

1300208031804410

MA.2(See Note 2)

[N-m]

185632

10601740354056108280

118001730025400

Mass

Spline nut[kg]

0.140.330.540.91.72.73.768.3

14.2

Spline shaft[kg/m]

11.82.73.86.8

10.615.621.33245

Unit: mm

E

15.5242832414652.555.564.570.5

Greasinghole

d0

2223344455

F

7.512141620.52326273235

Mountinghole

d1

4.55.55.56.69

1111141618

H

9121416182022242634

LBR 15○● LBR 20○● LBR 25○● LBR 30○● LBR 40○● LBR 50○ LBR 60○● LBR 70○● LBR 85○● LBR 100

Model No.

LBR 15○● LBR 20○● LBR 25○● LBR 30○● LBR 40○● LBR 50○ LBR 60○● LBR 70○● LBR 85○● LBR 100

0–0.013

Note 1: ○: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available.(Example) LBR40 A CM＋600L H



Note 2: MA.1 indicates the permissible moment value in the axial direction when one spline nut is used.MA.2 indicates the permissible moment value in the axial direction when two spline nuts are used.


2 LBR30 UU CM +700L H KModel







18

Model LBHDimensional Table for Model LBH

LW1

B

R

TJ

KM

W

4-S×R

N

C

Model No.


Height

M

293847.5577088

Width

W

3448607086

100

43627383

102115

263540506075

263540506075

B C

M4×10M6×12M8×16M8×16M10×20M12×25

S×R

152025303848

±0.15

172430354350

±0.15

678

101518

T

202633395063

K

Length

L


CT

[N-m]C0T

[N-m]


C[kN]

C0

[kN]

Staticpermissible

moment

MA(See Note 2)

[N-m]

Mass

Spline nut[kg]

0.230.581.11.733.185.1

25.4103171295586941

8.4 20.128.741.466.994.1

4.49.4

14.922.537.155.1

74.5213381657

14202500

30.490.2

176312696

1290

φ4 drive nippleA-M6FA-M6FA-M6FA-M6F

A-PT1/8

Spline shaft[kg/m]

11.82.73.86.8

10.6

Unit: mm

NGrease nipple

5768

1013.5

R

141822263240

○ LBH 15○● LBH 20○● LBH 25○● LBH 30○● LBH 40○● LBH 50

Model No.

○ LBH 15○● LBH 20○● LBH 25○● LBH 30○● LBH 40○● LBH 50

W1J

Note 1:○: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available.(Example) LBH30 A CM＋600L H



Note 2: MA indicates the permissible moment value in the axial direction when a single spline nut is used.Note 3: For details on the maximum lengths of ball spline shafts by accuracy, please see page 8.

2 LBH40 UU CL +700L P KModel







Model LTR-ADimensional Table for Models LTR-A

63.119760.1260

Model LTR16A or largerPCD

PCD1

L

FE

L1E

H

φDφD7φD6φD1 φD0

（60°equidistant）6-φd1

（60°equidistant）6-S×R

Standard type Type K（flange inversed）

LTR 8ALTR 10ALTR 16ALTR 20ALTR 25ALTR 32ALTR 40A

Model No.


Outer diameter LengthFlange

diameter

D L D1D6

h7D7 H L1 E E1 PCD PCD1Tolerance

323648566678

100

253350637180

100

4448647286

103130

24283643.5526379.5

16213135425264

336678

10

10.510.52121252533

69

1012131720

3——————

384256647589

113

19233036445468

E

Type K

8.511.51012131720

F

Oil holeposition

44

10.510.512.512.516.5

–0.009–0.025

–0.010–0.029

–0.012–0.034

19

2 LTR32A K UU ZZ CL +500L P KModel number

Flange orientationsymbolNo symbol: standardK: flange inversed

Symbol for clearancein the rotationaldirection (see page 6)


Symbol for standard hollow splineshaft (no symbol: solid spline shaft)

Number of splinenuts on one shaft(no symbol for onespline nut) Spline nut dust prevention accessory symbol No symbol: without seal

UU: rubber seal attached on both ends of spline nut U: rubber seal attached on either end of spline nut

Support bearing dust prevention accessory symbol No symbol: without sealZZ: rubber seal attached on both ends of support bearing Z: rubber seal attached on either end of support bearing


Overall spline shaft length (in mm)

87.2861

（90°equidistant）（90°equidistant）

Model LTR10A

Model LTR8A Model LTR10A

Model LTR8A

Standard type Type K（flange inversed）

Standard type Type K（flange inversed）PCD1PCD

4-S×R

φD1 φD6 φD7 φD

HE L1

L

φD1 φD6 φD7 φDE1

HE L1L

4-φd1

FE

FE

E1

CT

[N-m]

Basic torque ratingSpline shaftdiameter

C0T

[N-m]

Basic load rating

C[kN]

C0

[kN]MA

(See Note 1)

[N-m]

Static permissiblemoment Mass

Spline nut[kg]

Spline shaft[kg/m]

1.963.92

31.356.8

105180418

d1D0

h7

No. ofrows

of balls

3.43.44.54.55.56.69

8101620253240

4466666

2.947.84

34.355.8

103157377

1.472.847.05

10.215.220.537.8

2.554.9

12.617.825.83460.4

5.915.767.6

118210290687

0.080.130.350.510.791.252.51

0.40.621.62.53.95.69.9

Support bearing basic loadrating

C[kN]

C0

[kN]

0.690.776.77.49.7

10.516.5

0.240.36.47.8

10.612.520.7

Unit: mm

S×R

M2.6×3M3×4M4×6M5×8M5×8

M6×10M6×10

20

Note 1: MA indicates the permissible moment value in the axial direction when a single spline nut is used.Note 2: For details on the maximum lengths of ball spline shafts by accuracy, please see page 8.

21

Model LTRDimensional Table for Models LTR

2 LTR50 K UU ZZ CM +1000L H KModel number

Flange orientationsymbolNo symbol: standardK: flange inversed

Symbol for clearancein the rotationaldirection (see page 6)


Symbol for standard hollow splineshaft (no symbol: solid spline shaft)

Number of splinenuts on one shaft(no symbol for onespline nut) Spline nut dust prevention accessory symbol No symbol: without seal

UU: rubber seal attached on both ends of spline nut U: rubber seal attached on either end of spline nut

Support bearing dust prevention accessory symbol No symbol: without sealZZ: rubber seal attached on both ends of support bearing Z: rubber seal attached on either end of support bearing


Overall spline shaft length (in mm)

LTR 16LTR 20LTR 25LTR 32LTR 40LTR 50LTR 60

Model No.


Outer diameter Length Flange diameter

D L D1D6

h7H L1 E PCD PCD1 S×RTolerance

52566280

100120134

50637180

100125140

687278

105 130 156 170

39.543.55365.579.599.5

115

5669

111212

374855607497

112

10121317232525

60647091

113136150

323645556885

100

M5×8M5×8M6×8

M6×10M6×10M10×15M10×15

0–0.007

0–0.008

0–0.009

6-φd16-S×R

PCDPCD1

（60°equidistant）� （60°equidistant）�

22

CT

[N-m]

Basic torque ratingSpline shaftdiameter

C0T

[N-m]

Basic load rating

C[kN]

C0

[kN]MA

(See Note 2)

[N-m]

Static permissiblemoment Mass

Spline nut[kg]

Spline shaft[kg/m]

31.456.9

105180419842

1220

d1 U(See Note1) D0

h7

No. ofrows

of balls

4.54.54.56.69

1111

578

10131313

16202532405060

6666666

34.355.9

103157377769

1040

7.0610.215.220.537.860.973.5

12.617.825.83460.594.5

111.7

67.6118210290687

13401600

0.510.70.931.83.96.78.8

1.62.53.95.69.9

15.522.3

Support bearing basic loadrating

C[kN]

C0

[kN]

12.716.317.620.137.241.753.1

11.815.5182442.554.168.4

LL1E

H

φDφD6φD1 φD0

U(See Note 1)

Unit: mm

Note 1: Dimension U represents the dimension from the head of the hexagon socket screw to the spline nut end.Note 2: MA indicates the permissible moment value in the axial direction when a single spline nut is used.Note 3: For details on the maximum lengths of ball spline shafts by accuracy, please see page 8.

Ball Spline Series

Precautions on use

� Precautions on Handling� Disassembling components may cause dust to enter the system or degrade mounting accuracy of the components. Do not

disassemble the components.� Tilting a spline nut or spline shaft may cause them to fall by their own weight.� Dropping or hitting the Ball Spline may damage it. Giving an impact to the Ball Spline could also cause damage to its function even

if the product looks intact.

� Lubrication� Thoroughly remove anti-corrosion oil and feed a lubricant before using the product.� Do not mix lubricants of different physical properties.� In locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and low/high temperature,

normal lubricants may not be used. Contact THK for details.� When planning to use a special lubricant, contact THK before using it.� When adopting oil lubrication, the lubricant may not be distributed throughout the product depending on the mounting orientation of

the system. Contact THK for details.� Lubrication interval varies according to the service conditions. Contact THK for details.

� Precautions on Use� Entry of foreign material may cause damage to the ball circulation component or functional loss. Prevent foreign material, such as

dust or cutting chips, from entering the system.� Do not use the product at temperature of 80°C or higher. When desiring to use the system at temperature of 80°C or higher,

contact THK in advance. � When planning to use the product in an environment where the coolant penetrates the spline nut, it may cause trouble to product

functions depending on the type of the coolant. Contact THK for details. � If foreign material such as dust of cutting chips adheres to the product, replenish the lubricant after cleaning the product with pure

white kerosene.� When using the product in locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and

low/high temperature, contact THK in advance.

� Storage� When storing the Ball Spline, enclose it in a package designated by THK and store it in a horizontal orientation while avoiding high

temperature, low temperature and high humidity.

● “LM Guide” and “ ” are registered trademarks of THK CO., LTD.● The photo may differ slightly in appearance from the actual product.● The appearance and specifications of the product are subject to change without notice. Contact THK before placing an order.● Although great care has been taken in the production of this catalog, THK will not take any responsibility for damage resulting from typographical errors or omissions.● For the export of our products or technologies and for the sale for exports, THK in principle complies with the foreign exchange law and the Foreign Exchange

and Foreign Trade Control Law as well as other relevant laws.For export of THK products as single items, contact THK in advance. All rights reserved

HEAD OFFICE 3-11-6, NISHI-GOTANDA, SHINAGAWA-KU, TOKYO 141-8503 JAPAN INTERNATIONAL SALES DEPARTMENT PHONE:+81-3-5434-0351 FAX:+81-3-5434-0353

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Phone:+82-2-3468-4351SINGAPORETHK LM SYSTEM Pte. Ltd.

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Ball Spline Series - THK

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