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Boyo Bearing Co.,Ltd

Address:Village Ningxin Ningwei Town Xiaoshan Hangzhou, Hangzhou, Zhejiang, China

Tel:+86-510-11368463

M/P:+8613861854501

E-mail:sales@bywb-bearing.com

Tolerance For Bearing Units

- Sep 11, 2018 -

Tolerances for Mounted Ball Bearing Units 

Mounted bearing units for shaft sizes less than 2" have clearance fit-ups. Units for 2" and greater shaft sizes have light interference fit-ups.

Pillow block tolerance base to shaft is:

Bore

Tolerance

1/2 to 1-15/16 in

∓ .006 in

2 to 3-1/2 in

∓ .008 in

Inner and outer ring tolerances are shown in the tables below.

Inner Ring Tolerance (Metric and Inch)

MM

INCHES

Bore Diameter (d)

Tolerance

Bore Diameter (d)

Tolerance

Over

Inc.

+

-

Over

Inc.

+

-

10

18

0.015

0

0.394

0.709

0.0006

0

18

30

0.018

0

0.709

1.181

0.0007

0

30

50

0.021

0

1.181

1.969

0.0008

0

50

80

0.024

0

1.969

3.150

0.0009

0

80

120

0.028

0

3.150

4.724

0.0011

0

120

180

0.033

0

4.724

7.087

0.0013

0

Outer Ring Tolerance (Metric and Inch)

MM

INCHES

OD (D)

Tolerance

OD (D)

Tolerance

Over

Inc.

+

-

Over

Inc.

+

-

6

18

0

0.008

0.236

0.709

0

0.0003

18

30

0

0.009

0.709

1.181

0

0.00035

30

50

0

0.011

1.181

1.968

0

0.00045

50

80

0

0.013

1.968

3.150

0

0.0005

80

120

0

0.015

3.150

4.724

0

0.0006

120

150

0

0.018

4.724

5.905

0

0.0007

 


 




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