Ball Screw specifications

Lead (mm)

20

BCD (mm)

20.75

Thread minor diameter  (mm)

17.5

Threading direction/
no. of threaded grooves

Right-hand, 2

No. of circuits

2 rows X 1.8 turns

Clearance symbol

G0

GT

G2

Axial clearance (mm)

0

0.005 Max

0.02 Max

Basic dynamic load rating Ca(kN)

7.0

11.1

Basic static load rating C0a(kN)

12.3

24.7

Preload torque (N·m)

2.0×10-3¡­9.8×10-2

-

Spacer ball

1:1

None

 

 

 

Unit : mm

1kN¡Ö102kgf

 

Ball Screw model No.

Stroke

Screw-shaft length

Screw-shaft
longitudinal-axis
runout

D

Nut
circumferential
runout

H

Flange
perpen-
dicularity

I

Shaft
thread
runout

J

L1

L2

L3

BNK 2020-3.6G0+520LC5Y

300

410

435

520

0.050

0.015

0.011

0.012

BNK 2020-3.6G2+520LC7Y

0.075

0.030

0.018

0.014

BNK 2020-3.6G0+620LC5Y

400

510

535

620

0.050

0.015

0.011

0.012

BNK 2020-3.6G2+620LC7Y

0.075

0.030

0.018

0.014

BNK 2020-3.6G0+720LC5Y

500

610

635

720

0.065

0.015

0.011

0.012

BNK 2020-3.6G2+720LC7Y

0.090

0.030

0.018

0.014

BNK 2020-3.6G0+820LC5Y

600

710

735

820

0.085

0.015

0.011

0.012

BNK 2020-3.6G2+820LC7Y

0.120

0.030

0.018

0.014

BNK 2020-3.6G0+920LC5Y

700

810

835

920

0.085

0.015

0.011

0.012

BNK 2020-3.6G2+920LC7Y

0.120

0.030

0.018

0.014

BNK 2020-3.6G0+1020LC5Y

800

910

935

1020

0.110

0.015

0.011

0.012

BNK 2020-3.6G2+1020LC7Y

0.150

0.030

0.018

0.014

BNK 2020-3.6G0+1120LC5Y

900

1010

1035

1120

0.110

0.015

0.011

0.012

BNK 2020-3.6G2+1120LC7Y

0.150

0.030

0.018

0.014

BNK 2020-3.6G0+1220LC5Y

1000

1110

1135

1220

0.110

0.015

0.011

0.012

BNK 2020-3.6G2+1220LC7Y

0.150

0.030

0.018

0.014

BNK 2020-3.6G0+1320LC5Y

1100

1210

1235

1320

0.150

0.015

0.011

0.012

BNK 2020-3.6G2+1320LC7Y

0.190

0.030

0.018

0.014