precision ball screw/spline bns/ns - thk · precision ball screw/spline bns/ns spline nut seal seal...

Precision Ball Screw/SplineRotary-Nut SeriesLinear Motion + Rotary Motion

CATALOG No.327-1E

BNS/NS

1

Contents▼ Precision Ball Screw/Spline Models BNS/NS

Structure and Features ………… P.2

Types ………………………………… P.3

Static Safety Factor …………… P.4

Rated Life and Service Life Time … P.5

Accuracy …………………………… P.6

Action Patterns …………………… P.7

Examples of Installation……… P.10

Example of Use ………………… P.10

Dimensional Tables Model BNS-A … P.11to12

Model BNS…… P.13to14

Model NS-A… P.15to16

Model NS … P.17to18

2

Rotary-Nut SeriesPrecision Ball Screw/Spline BNS/NS

Spline nut

Seal

Seal

Seal

Seal

Shim plate

Shim plate

Outer ring

Outer ring

Outer ring

End cap

CollarShaft

Outer ring

Ball screw nut

Retainer

Retainer

Ball

Ball

Structure of Precision Ball Screw/Spline

● Zero Axial ClearanceThe Ball Spline has an angular-contact structure that causesno backlash in the rotational direction, enabling highlyaccurate positioning.

● Lightweight and CompactSince the ball screw nut is integrated with the support bearing,highly accurate and compact design is allowed. In addi-tion, small inertia through the lightweight ball screw nutensures high responsiveness.

● Smooth Motion with Low NoiseAs the Ball Screw is based on an end-cap mechanism,smooth motion with low noise is achieved.

● Highly Rigid Support BearingThe support bearing on the Ball Screw has a contact angle of60˚ in the axial direction while that on the Ball Spline has acontact angle of 30˚ in the moment direction, thus provide ahighly rigid shaft support. In addition, a dedicated rubber seal is attached as standard toprevent entry of foreign material.

● Easy InstallationThe ball spline nut is designed so that balls do not fall off evenif the spline nut is removed from the shaft, thus makinginstallation easy. The Ball Screw/Spline can easily be mountedsimply by securing it to the housing with bolts (for the hous-ing’s inner-diameter tolerance, H7 is recommended).

Structure and FeaturesThe Ball Screw/Spline is a linear-rotary unit that contains Ball Screw grooves and Ball Spline grooves cross-ing with each other on a single shaft. The nuts of the Ball Screw and the Ball Spline have dedicated sup-port bearings directly embedded on the circumference of the nuts. The Ball Screw/Spline is capable of performing three (rotary, linear and spiral) modes of motion with a sin-gle shaft by rotating or stopping the ball screw nut or the spline nut.It is optimal for machines using a combination of rotary and linear motions, such as a SCARA robot’s Z-axis,assembly robot, automatic loader, and machining center’s ATC equipment.

Japanese patent No. 2060726 (model NS), 2060727 (model BNS)

45° 45°

Structure of Support Bearing Model BNS-A

（30°）

60°

（30°） 60°

Structure of Support Bearing Model BNS

3

Types

Model BNS-A [compact type: linear motion + rotary motion] Model BNS [heavy-load type: linear motion + rotary motion]

Model NS-A [compact type: linear motion] Model NS [heavy-load type: linear motion]

4

BNS/NS OUTLINEProduct Overview

[Basic Static Load Rating C0a]When a Ball Screw receives an excessive load or a large impact load while it is stationary or in motion, a local permanent deformationoccurs between the raceway and the steel ball. If the permanent deformation exceeds a certain limit, it will prevent the Ball Screw fromsmoothly moving.It is recognized that in general there will be no operational problem if the amount of permanent deformation is up to approximately 0.0001of the steel ball diameter. The load present in such cases is called basic static load rating C0a.

[Static Safety Factor]

Static Safety FactorIt is necessary to take into account a static safety factor indicated in Table 1 against the axial load that isapplied on the Ball Screw. When studying the static safety factor, a basic static load rating C0a isrequired.

fs : Static safety factor (see Table 1)C0a : Basic static load rating (kN) (see the corresponding dimensional table)Fa : Axial load (kN)

fs ≦ C0aFa

fs : Static safety factorC0 : Basic static load rating (N)P : Calculated load (N)

fs ＝ C0

P

[Basic Static Load Rating C0]When a Ball Spline receives an excessive load or a large impact load while it is stationary or in motion, a local permanent deformationoccurs between the raceway and the rolling element. If the permanent deformation exceeds a certain limit, it will prevent the Ball Splinefrom smoothly moving.The basic static load rating is a static load with a constant direction and magnitude whereby the sum of the permanent deformation ofthe rolling element and that of the raceway on the contact area under the maximum stress is 0.0001 times the rolling element diameter.With the Ball Spline, it is defined in terms of radial load. Therefore, the basic static load rating is considered to be the limit of the staticpermissible load rating.

[Static Safety Factor fs]When the Ball Spline is stationary or in motion, an unexpected external force may be applied through inertia caused by vibrations, impactor start/stop. It is necessary to take into account a static safety factor against such a working load.A static safety factor (fs) of a Ball Spline is expressed in how many times greater is the load capacity (basic static load rating C0) than theload applied on the Ball Spline.

Ball Spline Unit

Ball Screw Unit

Table 1 Static Safety Factor

Machine using the Ball Screw Load conditions Lower limit of fs

General industrial machinery

Machine tools

1.0 to 1.32.0 to 3.01.0 to 1.52.5 to 7.0

Without vibrations or impactWith vibrations or impactWithout vibrations or impactWith vibrations or impact

5

[Basic Dynamic Load Rating Ca]Basic dynamic load rating Ca is used to calculate the service life of a Ball Screw in motion with its ball screw nut being under a load. The basic dynamic load rating Ca is an axial load under which the rated life of 90% of a group of the same Ball Screw units independ-ently operating is 106 rev (1 million revolutions).

[Rated Life]The service life of a Ball Screw is obtained from the equation below using the basic dynamic load rating and the axial load.

[Service Life Time]When the rated life (L) has been determined, the service life time is obtained from the following equation if the stroke lengthand the number of reciprocations are constant.

[Service Life Time]When the rated life (L) has been determined, the service life time is obtained if the stroke length and the number of oscilla-tions are constant.

(For details, see the General Catalog.)

(For details, see the General Catalog.)

Rated Life and Service Life Time

L : Rated life (rev)Ca : Basic dynamic load rating (N) (see the corresponding dimensional table)Fa : Axial load (N)fw : Load factor (see Table 2)

L = ( )3 106Cafw·Fa

Lh : Service life time (h)Rs : Stroke length (mm)n1 : Revolutions per minute (min-1)R : Lead (mm)

Lh =L R

2 Rs n1 60

L = ( · )3 ✕ 50CT

TC

fT · fC

fW

[Rated Life When a Torque is Applied]

L : Rated life (km)CT : Basic dynamic torque rating (N - m)TC : Calculated load torque (N - m)C : Basic dynamic load rating (N)PC : Calculated radial load (N)fT : Temperature factor (see the General Catalog)fC : Contact factor (see the General Catalog)fW : Load factor (see the General Catalog)

L = ( · )3 ✕ 50CPC

fT · fC

fW

[Rated Life When a Radial Load is Applied]

Ball Spline Unit

Ball Screw Unit

Lh : Service life time (h)RS : Stroke length (m)n1 : Oscillations per minute (opm)

Lh = L ✕ 103

2 ✕ RS ✕ n1 ✕ 60

Table 2 Load Factor

Vibrations/impact Velocity (V) fw

Faint

Weak

Medium

Strong

1.0 to 1.2

1.2 to 1.5

1.5 to 2.0

2.0 to 3.5

Very lowV≦0.25 m/s

Low0.25≦V≦1.0 m/s

Moderate1.0≦V≦2.0 m/s

High2.0 m/s＜V

6


AccuracyThe Ball Screw/Spline is manufactured with the following specifications.

Axial clearance : 0 or belowLead accuracy : C5(For details of the specification values, see the General Catalog.)

Ball Screw Unit

Clearance in the rotational direction : 0 or below (CL: light preload)Accuracy : class H(For details of the specification values, see the General Catalog.)

Ball Spline Unit

A B

C A E A

D B F B

Spline nut Ball screw nut

A B

H A

! BSpline nut

Ball screw nut

Model BNS Model NS

Unit: mm

0.014

0.014

0.018

0.018

0.021

0.021

0.025

0.025

Model No. C

0.017

0.017

0.021

0.021

0.021

0.021

0.025

0.025

D

0.014

0.014

0.016

0.016

0.018

0.018

0.021

0.021

E

0.016

0.016

0.020

0.020

0.024

0.024

0.033

0.033

F

0.010

0.010

0.013

0.013

0.016

0.016

0.019

0.019

H

0.013

0.013

0.016

0.016

0.016

0.016

0.019

0.019

!

BNS 0812NS 0812BNS 1015NS 1015BNS 1616NS 1616BNS 2020NS 2020BNS 2525NS 2525BNS 3232NS 3232BNS 4040NS 4040BNS 5050NS 5050

7

Action Patterns

Basic Actions of Model BNS

1 2

1

2

1 2

Motion Action direction

Input Shaft motion

Ball Screw pulley Ball Spline pulleyVertical direction

(speed)Rotational direction

(rotation speed)

①

Vertical direction → downward

Rotational direction → 0

Vertical direction → upward

Rotational direction → 0

Vertical direction → 0

Rotational direction → forward

Vertical direction → 0

Rotational direction → reverse





N1

(Forward)

-N1

(Reverse)

N1

-N1

0

0

0

0

N2

(Forward)

-N2

(Reverse)

N2

(N2≠0)

-N2

(-N2≠0)

V＝N1・R

(N1≠0)

V＝-N1・R

(N1≠0)

0

0

V＝N2・R

V＝-N2・R

0

0

N2 (Forward)

(N1＝N2≠0)

-N2 (Reverse)

(-N1＝-N2≠0)

N2

(Forward)

-N2

(Reverse)

②

①

②

①

②

1. Vertical

2. Rotational

3. Spiral

R: ball screw lead (mm)

N1: ball screw nut rotation speed (min-1)

Ball screw nut Ball screw nut pulley: N1

Spline nut

Spline nut pulley: N2

N2: spline nut rotation speed (min-1)

＋

＋

＋

＋

Shaft

8


Basic Actions of Model NS

1 2

Motion Action direction

Input

Ball Screw pulley

Shaft motion

Vertical direction (speed)

① Vertical direction → downward


N1

(Forward)

-N1

(Reverse)

V＝N1・R

(N1≠0)

V＝-N1・R

(N1≠0)②

1. Vertical

R: ball screw lead (mm)

N1: ball screw nut rotation speed (min-1)

Ball screw nut Ball screw nut pulley: N1

Spline nut

＋

＋

Shaft

9

Input Shaft motion

1

3

6

52 4

Motion Action direction Ball Screw pulley Ball Spline pulleyVertical direction

(speed)Rotational direction

(rotation speed)

① Vertical direction → upward




















-N1

(Reverse)

N1

(Forward)

N1

-N1

N1

-N1

N1

-N1

N1

N1

-N1

-N1

N1

N1

-N1

-N1

N1

-N1

-N1

N1

0

0

N2

(Forward)

0

0

-N2

(Reverse)

0

0

N2

0

0

-N2

0

N2

0

-N2

0

0

-N2

N2

V＝-N1・R(N1≠0)

V＝N1・R(N1≠0)

0

V＝-N1・R(N1≠0)

V＝N1・R(N1≠0)

0

V＝N1・R(N1≠0)

V＝-N1・R(N1≠0)

0

V＝N1・R(N1≠0)

V＝-N1・R(N1≠0)

0

V＝N1・R(N1≠0)

0

V＝-N1・R(N1≠0)

0

V＝N1・R(N1≠0)

V＝-N1・R(N1≠0)

0

0

0

0

N2 (Forward)

(N1＝N2≠0)

0

0

-N2 (Reverse)

(-N1＝N2≠0)

0

0

N2

(N1＝N2≠0)

0

0

-N2

(-N1＝N2≠0)

0

N2

(N1＝N2≠0)

0

-N2

(-N1＝N2≠0)

0

0

-N2

(-N1＝N2≠0)

N2

(N1＝N2≠0)

1. Upward → downward → forward → upward → downward → reverse

Extended Actions of Model BNS

13

6

52 4

1 32

4

132

4

②

③

④

⑤

⑥

①

②

③

④

①

②

③

④

①

②

③

④

⑤

⑥

2. Downward → upward → forward → downward → upward → reverse

3. Downward → forward → upward → reverse

4. Downward → upward → forward → reverse

10


Example of Use

Ball screw input motor

Spline input motor

Spline nut

Chuck

Str

oke

Str

oke

Ball screw nut

Shaft

Pulley

Pulley

Support bearing

Example of Using Model BNS (Z Axis of a SCARA Robot)

Examples of Installation

[Example of Installing Model BNS]

[Example of Installing Model NS]

Seal

Seal

Support bearing Support

bearingBall screw nut

Shaft

Spline nut

Pulley

Pulley●Example of installing the ball

screw nut input pulley and thespline nut input pulley, both out-side the housing.The housing length is minimized.

Pulley ●Example of installing the ballscrew nut pulley inside thehousing.

Seal

Shaft

Spline nut

Pulley

Support bearing

Ball screw nut

●Example of installing the ballscrew nut pulley outside thehousing.The housing length is minimized.

Pulley

●Example of installing the ballscrew nut pulley inside thehousing.

11

Model BNS-ADimensional Table for Model BNS-ACompact Type: Linear Motion + Rotary Motion

BNS2020A +500LOverall shaft length(in mm)

Modelnumber

6-φd1(60˚ equidistant)4-S

(90˚ equidistant)

4-φd1(90˚ equidistant)

4-S(90˚ equidistant)

P1P2

P1P2

Models BNS 0812A and 1015A

Model No.

Lead

Ph

Basic load rating

Ca C0a

kN kN

Ball center-to-center diameter

dp

Thread minor

diameter

dc

Outer diameter

D

g6

Flange

diameter

D1

Overall

length

L1

D3

h7

D4

H712151620253240

Screw

shaft inner

diameter

dp——1114182329

Screw

shaft outer

diameter

d8

101620253240

1.11.73.96.19.1

1321.4

1.82.77.2

12.319.329.849.7

8.410.516.6520.752633.2541.75

6.68.3

13.717.52228.335.2

323648566678

100

4448647286

103130

28.534.54048587288

22263643.5526379.5

19233239475873

BNS 0812ABNS 1015ABNS 1616ABNS 2020ABNS 2525ABNS 3232ABNS 4040A

Ball screw dimensions

Model No.Static permissible

momentMA

N-m

Basic torque rating

CT C0T

N-m N-m

Outer diameter

D7

g6

Flange

diameter

D5

Overall

length

L2

D6

h7 BE1

5.915.767.6

118210290687

2.64.9

12.617.825.83460.5

Basic load rating

C C0

kN kN1.52.77.1

10.215.220.537.8

23.9

31.456.8

105180418

2.97.8

34.355.8

103157377

323648566678

100

4448647286

103130

253350637180

100

24283643.5526379.5

16213135425264

BNS 0812ABNS 1015ABNS 1616ABNS 2020ABNS 2525ABNS 3232ABNS 4040A

Ball spline dimensions

Example of model number coding

Ball screw unit

Ball spline

19233239475873

BE

Note For the db dimension (shaft diameter 16 to 40), solid shaft and K hollow shaft (thick) is available. For details, see the “BallSpline” page of the General Catalog.

12

MA

6-S1×t1

(60˚ equidistant)

6-φdS1

(60˚ equidistant)

4-φdS1

(90˚ equidistant)

4-S1×t1(90˚ equidistant)

P4

P3

Models BNS 0812A and 1015AModel BNS 1015AModel BNS 0812A

L1

B5 B4

Ht

Te

φD1 φD3 φD4

φBE φD φD7 φBE1

φD5φD6φd

L2

B6 B7

H1

φdbφdp

L2

B6 B7

H1

φD7φBE1

H2

φD6 φD5

L2

B6 B7

φD6 φD5

H1

φD7 φBE1

P4

P3

d1

3.43.44.54.55.56.69

t1011.513.516.5202124.5

P2

14.5182531384861

P1

384256647589

113

Te1.51.522.5333

B5

78

1011131416.5

B4

10.510.52121252533

H336678

10

SM2.6M3M4M5M6M6M8

Unit: mm

Unit: mm

Nut inertial

moment

kg・cm2

0.030.080.440.992.25.17

16.1

S1✕t1

M2.6✕3M3✕4M4✕6M5✕8M5✕8

M6✕10M6✕10

P4

19233036445468

P3

384256647589

113

H2

3——————

B7

69

1012131720

B6

10.510.52121252533

H1

336678

10

dS1

3.43.44.54.55.56.69

Support bearing

basic load rating

C C0

kN kN0.60.86.77.49.7

10.516.5

0.20.36.47.8

10.612.520.7

0.80.98.79.7

12.713.621.5

Screw shaft

inertial

moment/mm

J kg・cm2/mm3.16✕10-5

7.71✕10-5

3.92✕10-4

9.37✕10-4

2.2✕10-3

5.92✕10-3

1.43✕10-2

Nut inertial

moment

kg・cm2

0.030.080.350.852.125.42

17.2

Support bearing

basic load rating

Ca C0a

kN kN0.50.7

10.513.418.222.336.8

Shaft

mass

kg/m0.350.520.81.211.792.964.51

Nut

mass

kg0.080.150.310.540.881.393.16

Nut

mass

kg0.080.130.350.510.791.252.51

13

Model BNSDimensional Table for Model BNSHeavy-load Type: Linear Motion + Rotary Motion

BNS2525 +600LOverall shaft length(in mm)

Modelnumber


4-S

P1P2

θ

Model No.

Lead

Ph

Basic load rating

Ca C0a

kN kN


dp

Thread minor

diameter

dc

Outer diameter

D

Flange

diameter

D1

Overall

length

L1

D3

h7162025324050

Screw

shaft inner

diameter

dp111418232936

Screw

shaft outer

diameter

d162025324050

3.96.19.1

1321.431.8

7.212.319.329.849.777.6

16.6520.752633.2541.7552.2

13.717.52228.335.244.1

687892

105140156

43.554658098

126

4050586690

100

BNS 1616BNS 2020BNS 2525BNS 3232BNS 4040BNS 5050



momentMA

N-m

Basic torque rating

CT C0T

N-m N-mOuter diameter

D7

Flange

diameter

D5

Overall

length

L2

67.6118210290687

1340

12.617.825.83460.594.5

Basic load rating

C C0

kN kN7.1

10.215.220.537.860.9

31.456.8

105180418842

34.355.8

103157377768

52566280

100120

0–0.0070

–0.0070

–0.0070

–0.0070

–0.0080

–0.008

687278

105130156

50637180

100125

BNS 1616BNS 2020BNS 2525BNS 3232BNS 4040BNS 5050



Note Dimension “U” indicates the length from the head of the hexagon socket bolt to the ball screw nut end face.

Ball screw unit

Ball spline

52627280

110120

0–0.0070

–0.0070

–0.0070

–0.0070

–0.0080

–0.008

D4

H7323947587390

Note For the db dimension, solid shaft and K hollow shaft (thick) are available. For details, see the “Ball Spline” page of theGeneral Catalog.

14

MA

6-S1×t1(60˚ equidistant)6-φdS1

P4P3

L1B5 B4Ht

Te

φD1φD3φD4 φD φD7 φdφD6φD5

L2B6 B7H1

φdbφdp

U (see note)

Screw shaft

inertial

moment/mm

J kg・cm2/mm3.92✕10-4

9.37✕10-4

2.2✕10-3

5.92✕10-3

1.43✕10-2

3.52✕10-2

Nut inertial

moment

kg・cm2

0.481.443.236.74

27.958.2

d1

4.54.55.56.69

11

θ°404040405050

t121619192228

P2

253138486175

P1

60708191

123136

Te223334

B5

91112.51416.525

B4

27.53443556880

H5689

1112

SM4M5M6M6M8

M10

Support bearing

basic load rating

Ca C0a

kN kN19.426.828.23059.362.2

19.229.333.33974.183

Unit: mm

Unit: mm

Nut inertial

moment

kg・cm2

0.520.871.725.61

14.762.5

S1×t1

M5✕8M5✕8M6✕8

M6✕10M6✕10

M10✕15

P4

323645556885

P3

60647091

113136

B7

101213172325

B6

374855607497

H1

5669

1112

D6

h739.543.55365.579.599.5

U578

101313

dS1

4.54.54.56.69

11

Support bearing

basic load rating

C C0

kN kN12.716.217.620.137.241.6

11.815.5182442.554.1

Nut

mass

kg0.380.681.11.743.956.22

Shaft

mass

kg/m0.81.211.792.964.517.16

Nut

mass

kg0.510.70.931.83.96.7

15

Model NS-ADimensional Table for Model NS-ACompact Type: Linear Motion

NS2020A +500LOverall shaft length(in mm)

Modelnumber

6-φd1

(60˚ equidistant)4-S

(90˚ equidistant)

4-φd1(90˚ equidistant)4-S

(90˚ equidistant)

P1

P2

P1

P2

Models BNS 0812A and 1015A

Model No.

Lead

Ph

Basic load rating

Ca C0a

kN kN


dp

Thread minor

diameter

dc

Outer diameter

D

g6

Flange

diameter

D1

Overall

length

L1

D3

h7

D4

H712151620253240

Screw

shaft inner

diameter

dp——1114182329

Screw

shaft outer

diameter

d8

101620253240

1.11.73.96.19.1

1321.4

1.82.77.2

12.319.329.849.7

8.410.516.6520.752633.2541.75

6.68.3

13.717.52228.335.2

323648566678

100

4448647286

103130

28.534.54048587288

22263643.5526379.5

19233239475873

NS 0812ANS 1015ANS 1616ANS 2020ANS 2525ANS 3232ANS 4040A



momentMA

N-m

Basic torque rating

CT C0T


D7

Flange

diameter

D5 -0.2

5.915.767.6

118210290687

2.64.9

12.617.825.83460.5

Basic load rating

C C0

kN kN1.52.87.1

10.215.220.537.8

23.9

31.456.8

105180418

2.97.8

34.355.8

103157377

324251586577

100

324251586577

100

NS 0812ANS 1015ANS 1616ANS 2020ANS 2525ANS 3232ANS 4040A


16213135424964

0–0.0110

–0.0130

–0.0130

–0.0160

–0.0160

–0.0160

–0.019

0


Ball screw unit

Ball spline

BE19233239475873

Note For the db dimension (shaft diameter 16 to 40), solid shaft and K hollow shaft (thick) is available. For details, see the “BallSpline” page of the General Catalog.

16

MA

4-φdS1 drilled through, φds2 counter bore depth h

(90˚ equidistant)

45° 45°

P3


(90˚ equidistant)45° 45°

P3

L1B5 B4

Ht

Te

φD1φD3φD4

φBE φDφD7

φD5φd

L2

B6 H1

φdbφdp

r

3-φd0

Models NS 0812A and 1015A

φD3φD4φdpφD1 φD5

L2

B6 H1

φD7

2-φd0

r

φDφBE

φd

Te

t

H

B5 B4

L1

d1

3.43.44.54.55.56.69

t1011.513.516.5202124.5

P2

14.5182531384861

P1

384256647589

113

Te1.51.522.5333

B5

78

1011131416.5

B4

10.510.52121252533

H336678

10

SM2.6M3M4M5M6M6M8

Unit: mm

Unit: mm

24324045526282

0.50.50.50.50.50.50.5

7.510.51822.526.53036

56799

1014

3.44.54.55.55.56.69

1.51.522334

3.34.44.45.45.46.58.6

6.5889.59.5

1114

253350637180

100

0–0.20

–0.20

–0.30

–0.30

–0.3

Screw shaft

inertial

moment/mm

J kg・cm2/mm3.16✕10-5

7.71✕10-5

3.92✕10-4

9.37✕10-4

2.2✕10-3

5.92✕10-3

1.43✕10-2

Nut inertial

moment

kg・cm2

0.030.080.350.852.125.42

17.2

Support bearing

basic load rating

Ca C0a

kN kN0.80.98.79.7

12.713.621.5

0.50.7

10.513.418.222.336.8

Nut

mass

kg0.080.150.310.540.881.393.16

Shaft

mass

kg/m0.350.520.81.211.792.964.51

Overall length

L2 P3rB6H1 dS1

Greasing hole

d0 h

Mounting hole

d2

0.040.090.230.330.450.581.46

Nut

mass

kg

17

Model NSDimensional Table for Model NSHeavy-load Type: Linear Motion

NS2525 +600LOverall shaft length(in mm)

Modelnumber


4-S

P1P2

θ


momentMA

N-m

Basic torque rating

CT C0T


D7

67.6118210290687

1340

12.617.825.83460.594.5

Basic load rating

C C0

kN kN7.1

10.215.220.537.860.9

31.456.9

105180419842

34.355.9

103157377769

NS 1616NS 2020NS 2525NS 3232NS 4040NS 5050


313542496480

0–0.0130

–0.0160

–0.0160

–0.0160

–0.0190

–0.019

Model No.

Lead

Ph

Basic load rating

Ca C0a

kN kN


dp

Thread minor

diameter

dc

Outer diameter

D

Flange

diameter

D1

Overall

length

L1

D3

h7

Screw

shaft inner

diameter

dp

Screw

shaft outer

diameter

d

NS 1616NS 2020NS 2525NS 3232NS 4040NS 5050



D4

H7323947587390

Ball screw unit

Ball spline

162025324050

111418232936

162025324050

3.96.19.1

1321.431.8

7.212.319.329.849.777.6

16.6520.752633.2541.7552.2

13.717.52228.335.244.1

52627280

110120

0–0.0070

–0.0070

–0.0070

–0.0070

–0.0080

–0.008

687892

105140156

43.554658098

126

4050586690

100

Note For the db dimension, solid shaft and K hollow shaft (thick) are available. For details, see the “Ball Spline” page of theGeneral Catalog.

18

MA

L1

B5 B4H

t

Te

φD φD7

L2

B6 H1

φdbφdpφD4φD3φD1


(90˚ equidistant)

45° 45°

P3

r

φD5φd

3-φd0

Flange

diameter

D5Overall length

L2

51586577

100124

P3

4045526282

102

r0.50.50.50.50.51

B6

1822.526.5303646.5

H1

799

101416

dS1

4.55.55.56.69

11

Greasing hole

d0

223344

h4.45.45.46.58.6

11

Mounting hole

d2

89.59.5

111417.5

50637180

100125

0–0.20

–0.20

–0.30

–0.30

–0.30

–0.3

Unit: mm

Unit: mm

Screw shaft

inertial

moment/mm

J kg・cm2/mm3.92✕10-4

9.37✕10-4

2.2✕10-3

5.92✕10-3

1.43✕10-2

3.52✕10-2

Nut inertial

moment

kg・cm2

0.481.443.236.74

27.958.2

d1

4.54.55.56.69

11

θ°404040405050

t121619192228

P2

253138486175

P1

60708191

123136

Te223334

B5

91112.51416.525

B4

27.53443556880

H5689

1112

SM4M5M6M6M8

M10

Support bearing

basic load rating

Ca C0a

kN kN19.426.828.23059.362.2

19.229.333.33974.183

Nut

mass

kg0.380.681.11.743.956.22

Shaft

mass

kg/m0.81.211.792.964.517.16

Nut

mass

kg0.230.330.450.581.462.76

Precision Ball Screw/Spline Models BNS/NSPrecautions on Use

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

components.� Tilting the shaft and the ball screw nut (or spline nut) may cause them to fall by their own weight.� Dropping or hitting the Precision Ball Screw/Spline may damage or fracture the ball circulation component, which may cause functional loss.

Giving an impact to the product 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.� Lubrication interval varies according to the service conditions. Contact THK for details.� When lubricating the Precision Ball Screw/Spline, attach a greasing plate to the housing in advance

(see the figure on the right).� Precautions on Use

� Do not remove the ball screw nut (or spline nut) from the shaft. Doing so may cause the balls to fall off.� Entry of foreign material to the ball screw nut (or spline nut) may cause damage to the ball circulation component or functional loss. Prevent

foreign material, such as dust or cutting chips, from entering the system.� If foreign material adheres to the product, replenish the lubricant after cleaning the product. For the type of the detergent, contact THK.� When planning to use the product in an environment where the coolant penetrates the ball screw nut (or spline nut), it may cause trouble to

product functions depending on the type of the coolant. Contact THK for details.� 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.� If using the product with vertical mount, the ball screw nut (or spline nut) may fall by its own weight. Attach a mechanism to prevent it from falling.� Using the product at speed exceeding the permissible rotation speed may cause breakage of a component or accident. Be sure to use the

product within the specification range designated by THK.� Forcibly driving in a component may cause an indentation on the raceway. Use care when mounting components.� If an offset or skewing occurs with the ball screw shaft support and the ball screw nut (or spline nut), it may substantially shorten the service life.

Pay much attention to components to be mounted and to the mounting accuracy.� 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.� Letting the ball screw nut (or spline nut) overshoot will cause balls to fall off or the ball circulation component to be damaged. Be sure not to let it

overshoot.� Storage

� When storing the Precision Ball Screw/Spline, enclose it in a package designated by THK and store it in a horizontal orientation while avoidinghigh temperature, low temperature and high humidity.

Greasing plate Grease nipple

Housing

Lubrication Method

● “LM Guide,” “Caged Ball” 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

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