tolerances
NHBB is an active member in the American Bearing Manufacturers Association (ABMA) and its associated bearing technical committees—the Annular Bearing Engineers’ Committee (ABEC) and the Roller Bearing Engineers’ Committee (RBEC). With assistance from ABEC, RBEC, and member management, the ABMA issues standards for bearing tolerances. Please consult with NHBB Engineering for Torque Tube and Thinex Bearing Tolerances.
Inner Ring Tolerances
| Tolerances in Inches |
| Bore Size
(mm) |
Bore Diameter Tolerance
ABEC/RBEC Class |
Radial Runout Maximum
ABEC/RBEC Class |
Ring Width |
ABEC
1 & 3 |
ABEC
5, 7 & 9 |
Duplex |
OVER |
INCL |
1 |
3 |
5 |
7 |
9 |
1 |
3 |
5 |
7 |
9 |
SINGLE |
SINGLE |
INDIVIDUAL
RING |
| - |
10 |
.0003 |
.0003 |
.0002 |
.00015 |
.0001 |
.0004 |
.00025 |
.00015 |
.0001 |
.00005 |
.0047 |
.0016 |
.0098 |
| 10 |
18 |
.0003 |
.0003 |
.0002 |
.00015 |
.0001 |
.0004 |
.0003 |
.00015 |
.0001 |
.00005 |
.0047 |
.0031 |
.0098 |
| 18 |
30 |
.0004 |
.0003 |
.00025 |
.0002 |
.0001 |
.0005 |
.0003 |
.00015 |
.0001 |
.0001 |
.0047 |
.0047 |
.0098 |
| 30 |
50 |
.00045 |
.0004 |
.0003 |
.00025 |
.0001 |
.0006 |
.0004 |
.0002 |
.00015 |
.0001 |
.0047 |
.0047 |
.0098 |
| 50 |
80 |
.0006 |
.00045 |
.00035 |
.0003 |
.00015 |
.0008 |
.0004 |
.0002 |
.00015 |
.0001 |
.0059 |
.0059 |
.0098 |
| 80 |
120 |
.0008 |
.0006 |
.0004 |
.0003 |
.0002 |
.0010 |
.0005 |
.00025 |
.0002 |
.0001 |
.0079 |
.0079 |
.0150 |
| 120 |
180 |
.0010 |
.0007 |
.0005 |
.0004 |
.0003 |
.0012 |
.0007 |
.0003 |
.00025 |
.00015 |
.0098 |
.0098 |
.0150 |
| 180 |
250 |
.0012 |
.00085 |
.0006 |
.00045 |
.0003 |
.0016 |
.0008 |
.0004 |
.0003 |
.0002 |
.0118 |
.0118 |
.0197 |
Outer Ring Tolerances
| Tolerances in Inches |
| Outside Diameter
(mm) |
Outside Diameter Tolerance
ABEC/RBEC Class |
Radial Runout Maximum
ABEC/RBEC Class |
Ring Width |
ABEC
1 & 3 |
ABEC
5, 7 & 9 |
Duplex |
OVER |
INCL |
1 |
3 |
5 |
7 |
9 |
1 |
3 |
5 |
7 |
9 |
SINGLE |
SINGLE |
INDIVIDUAL
RING |
| 18 |
30 |
.00035 |
.0003 |
.00025 |
.0002 |
.00015 |
.0006 |
.00035 |
.00025 |
.00015 |
.0001 |
.0047 |
.0016 |
.0098 |
| 30 |
50 |
.00045 |
.00035 |
.0003 |
.00025 |
.00015 |
.0008 |
.0004 |
.0003 |
.0002 |
.0001 |
.0047 |
.0031 |
.0098 |
| 50 |
80 |
.0005 |
.00045 |
.00035 |
.0003 |
.00015 |
.0010 |
.0005 |
.0003 |
.0002 |
.00015 |
.0047 |
.0047 |
.0098 |
| 80 |
120 |
.0006 |
.0005 |
.0004 |
.0003 |
.0002 |
.0014 |
.0007 |
.0004 |
.00025 |
.0002 |
.0047 |
.0047 |
.0098 |
| 120 |
150 |
.0007 |
.0006 |
.00045 |
.00035 |
.0002 |
.0016 |
.0008 |
.00045 |
.0003 |
.0002 |
.0059 |
.0059 |
.0098 |
| 150 |
180 |
.0010 |
.0007 |
.0005 |
.0004 |
.0003 |
.0018 |
.0009 |
.0005 |
.0003 |
.0002 |
.0079 |
.0079 |
.0150 |
| 180 |
250 |
.0012 |
.0008 |
.0006 |
.00045 |
.0003 |
.0020 |
.0010 |
.0006 |
.0004 |
.0003 |
.0098 |
.0098 |
.0150 |
| 250 |
315 |
.0014 |
.0010 |
.0007 |
.0005 |
.0003 |
.0024 |
.0012 |
.0007 |
.00045 |
.0003 |
.0118 |
.0118 |
.0197 |
|
