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ABEC1 Rotary Bearing Tolerances

Many countries throughout the world have their own standards organizations. For example, Germany, Japan, Korea, Russia, and China are major bearing producers and all have industrial standards that cover ball and roller bearings. In almost all cases, these standards are similar to or state equivalency with ISO 492. The Table below shows the equivalent tolerance grades for three of the most common standards.

Bearing Classes by Standard
ANSI Standard 20 ISO 492 DIN 620
ABEC 1 Class Normal P0
ABEC 3 Class 6 P6
ABEC 5 Class 5 P5
ABEC 7 Class 4 P4
ABEC 9 Class 2 P2



The following tables list the actual ABEC and RBEC tolerances per ABMA Standard 20. The tables list tolerances for both inner and outer rings, in both inch and metric units. These tables are useful in determining sizes and tolerance for components, such as shafts and housings. The designer should always do a tolerance stack up study at both maximum and least material conditions when sizing components, particularly when designing for miniature ball bearings. Some tolerances have been omitted for clarity. Tolerances for tapered roller bearings can be found in ABMA Standard 19.1 and are not included in these tables.

Inner Ring Tolerance Class ABEC-1, RBEC-1 (ISO Class Normal)
Bore Diameter (d) Bore
Tolerance
Radial
Runout
Width Tolerance
mm inch All Single Brg Paired Brgs
over incl. over incl. high low max. high low
0.6 2.5 0.0236 0.0984 0 -3

4

0 -47 -
2.5 10 0.0984 0.3937 0 -3 4 0 -47 -98
10 18 0.3937 0.7087 0 -3 4 0 -47 -98
18 30 0.7087 1.1811 0 -4 5 0 -47 -98
30 50 1.1811 1.9685 0 -4.5 6 0 -47 -98
50 80 1.9685 3.1496 0 -6 8 0 -59 -150
80 120 3.1496 4.7244 0 -8 10 0 -79 -150
120 180 4.7244 7.0866 0 -10 12 0 -98 -197
180 250 7.0866 9.8425 0 -12 16 0 -118 -197
250 315 9.8425 12.4016 0 -14 20 0 -138 -197
315 400 12.4016 15.7480 0 -16 24 0 -157 -248
Table tolerance values 0.0001 inch - English Units


Outer Ring Tolerance Class ABEC-1, RBEC-1 (ISO Class Normal)
Outer Diameter (d)

Outer Dia.
Tolerance

Radial
Runout
Width Tolerance
mm inch All Single Brg Paired Brgs
over incl. over incl. high low max. high low
2.5 6 0.0984 0.2362 0 -3 6

Identical to Width Tolerance of

 Inner Ring of the same Bearing

6 18 0.2362 0.7087 0 -3 6
18 30 0.7087 1.1811 0 -3.5 6
30 50 1.1811 1.9685 0 -4.5 8
50 80 1.9685 3.1496 0 -5 10
80 120 3.1496 4.7244 0 -6 14
120 150 4.7244 5.9055 0 -7 16
150 180 5.9055 7.0866 0 -10 18
180 250 7.0866 9.8425 0 -12 20
250 315 9.8425 12.4016 0 -14 24
315 400 12.4016 15.7480 0 -16 28
400 500 15.7480 19.6850 0 -18 31
500 630 19.6850 24.8031 0 -20 39
630 800 24.8031 31.4961 0 -30 47
800 1000 31.4961 39.3701 0 -39 55
Table tolerance values 0.0001 inch - English Units
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