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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

BALL BEARING TOLERANCES

- May 08, 2018 -

Precision ball bearings are manufactured to standards established by the Annular Bearing Engineers Committee (ABEC) of the American Bearing Manufacturers Association (ABMA). These standards have been accepted by the American National Standards Institute (ANSI) and conform essentially to the standards set by the International Standards Organization (ISO).


ABEC/ISO INNER RING TOLERANCES

Dimensions in Inches

INNER RING TOLERANCES Inches (mm)


TYPE

OD SIZE

ABEC 1
ISO Normal

ABEC 3
ISO P6

ABEC 5
ISO P5

ABEC 7
ISO P4

MEAN BORE TOLERANCE

ALL

0 to .709
0 to 18

0 to -.0003
0 to -.008

0 to -.0002
0 to -.005

0 to -.0002
0 to -.005

0 to -.0002
0 to -.005

2 PT OUT OF ROUNDNESS*

ALL

0 to .709
0 to 18

NS

NS

.0001
.003

.0001
.003

BORE TAPER*

ALL

0 to .709
0 to 18

NS

NS

.0001
.003

.0001
.003

RADIAL RUNOUT*

ALL

0 to .709
0 to 18

.0003
.008

.0002
.005

.00015
.004

.0001
.003

FACE RUNOUT WITH BORE*

ALL

0 to .709
0 to 18

NS

NS

.0003
.008

.0001
.003

FACE RUNOUT*

ALL

0 to .709
0 to 18

NS

NS

.0003
.008

.0001
.003

WIDTH VARIATION*

ALL

0 to .709
0 to 18

NS

NS

.0002
.005

.0001
.003

RING WIDTH TOLERANCE

ALL

0 to 1.1811
0 to 30

0 to -.005
0 to -.125

0 to -.005
0 to -.125

0 to -.001
0 to -.025

0 to -.001
0 to -.025


* Maximum allowed value

NS = Not Specified

ABEC/ISO OUTER RING TOLERANCES

Dimensions in Inches


TYPE

OD SIZE

ABEC 1
ISO Normal

ABEC 3
ISO P6

ABEC 5
ISO P5

ABEC 7
ISO P4

MEAN OD TOLERANCE

ALL

0 to .709
0 to 18
.709 to 1.1811
18 to 30

+0 to -.0003
+0 to -.008
+0 to -.0004
+0 to -.010

+0 to -.0003
+0 to -.008
+0 to -.0003
+0 to -.008

+0 to -.0002
+0 to -.005
+0 to -.0002
+0 to -.005

+0 to -.0002
+0 to -.005
+0 to -.0002
+0 to -.005

MAX OD TOLERANCE LIMITS

OPEN




SHIELDED

0 to .709
0 to 18
.709 to 1.1811
18 to 30
0 to .709
0 to 18
.709 to 1.1811
18 to 30

+.0001 to -.0004
+.003 to -.010
+.0001 to -.0005
+.025 to -.010 
+.0002 to -.0005
+.005 to -.012
+.0002 to -.0006
+.005 to -.015

+.0001 to -.0004
+003 to -.010
+.0001 to -.0004
+025 to -.010 
+.0002 to -.0005
+.005 to -.012
+.0002 to -.0005
+.005 to -.012

+0 to -.0002
+0 to -.005
+0 to -.0002
+.000 to -.005
+.00004 to -.00024
+001 to -.006
+.00004 to -.00024
+.001 to -.006

+0 to -.0002
+0 to -.005
+0 to -.0002
+0 to -.005
+.00004 to -.00024
+001 to -.006
+.00004 to -.00024
+001 to -.006

OD 2P OUT OF ROUNDNESS

OPEN




SHIELDED

0 to .709
0 to 18
.709 to 1.1811
18 to 30mm

0 to 1.1811
0 to 30

NS


NS


NS

NS


NS


NS

.0001
.0025
.0001
.0025
.0001
.0025

.0002
.005

.0001
.0025
.0001
.0025
.0001
.0025

.0002
.005

OD TAPER*

OPEN



SHIELDED

0 to 1.1811
0 to 30

0 to 1.1811
0 to 30

NS


NS

NS


NS

.0001
.0025
.0001
.0025

.0002
.005

.0001
.0025
.0001
.0025

.0002
.005

RADIAL RUNOUT*

ALL

0 to 1.1811
0 to 30

.0006
.015

.0004
.010

.0002
.005

.00015
.004

OD RUNOUT WITH FACE*

ALL

0 to .709
0 to 18

NS

NS

.0003
.008

.00015
.004

FACE RUNOUT*

STRAIGHT


FLANGED

0 to 1.1811
0 to 30

0 to -1.1811
0 to 30

NS


NS

NS


NS

.0003
.008

.0003
.008

.0002
.005

.0003
.008

WIDTH VARIATION*

ALL

0 to 1.1811
0 to 30

NS

NS

0 to -.002
0 to -.005

0 to -.0001
0 to -.003

FLANGE WIDTH TOLERANCE


0 to 1.1811
0 to 30

0 to -.002
0 to -.050

0 to -.002
0 to -.050

0 to -.002
0 to -.050

0 to -.002
0 to -.050

FLANGE DIAMETER TOLERANCE


0 to 1.1811
0 to 30

+005 to -.002
+.125 to -.050

+005 to -.002
+.125 to -.050

0 to -.001
0 to -.025

0 to -.001
0 to -.025


* Maximum allowed value

NS = Not Specified


ABEC RUNOUT

The tolerances shown in the ABEC and ISO tables are specific for basic bearing dimensions and require no further explanation. The following information may also help the design engineer use the runout values shown for different tolerance ratings. 

Outer ring: The total indicator reading during one complete revolution of the outer ring with the inner ring remaining stationary.

Inner ring: The total indicator reading during one complete revolution of the inner ring with the outer ring remaining stationary.
FACE RUNOUT
Inner ring: The total indicator reading during one complete revolution of the inner ring with the outer ring remaining stationary.
Outer ring: The total indicator reading during one complete revolution of the outer ring with the inner ring remaining stationary.
FACE RUNOUT WITH BORE
The total indicator reading during one complete revolution of the inner ring.
O.D. RUNOUT WITH FACE
The total indicator reading during one complete revolution of the outer ring. The outer ring is positioned against 2 stops oriented at 90° to each other.


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