ABIS Miniature Ball Bearings Tolerances
With bores of 0.6 to 90mm and precision grades to ABEC 7
General Information
ABIS BEaring Tolerances
For inch bearings tolerances are based on Section 3 of the AFBMA Standards for ABEC Class 1 and Section 12 for ABEC Class 3. Refer to Table 1.
For metric series bearings up to 9mm outer diameter tolerances are based on AFBMA Standards as above. For diameters over 9mm they are based on ISO R492-R1648 tolerances Class P0, P6 and P5. Refer to Tables 1 & 2.
N.B. Thin section bearings, Series E only, are available in tolerance Class P5.
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Table 1
Bearings with bore sizes 0-0.375 inches, 0-18mm. Outside diameters 0-30mm
 ABEC | Parameters | ISO | ||||||||||
Unit 0.0001 Inch | Unit 0.001mm | |||||||||||
Class 1 | Class 3 | Â Class 5 | Class 0 | Class 6 | Class 5 | |||||||
High | Low | High | Low | High | Low | Inner Ring Diameter | High | Low | High | Low | High | Low |
0 | -3 | 0 | -3 | 0 | -2 | Mean value of bore dm | 0 | -8 | 0 | -7 | 0 | -5 |
+1 | -4 | +1 | -3 | 0 | -2 | Absolute value of bore d | +2 | -10 | +1 | -8 | 0 | -5 |
3 | – | 2 | – | 1.5 | – | Radial run out (max.) | 10 | – | 6 | Â | 5 | Â |
0 | -50 | 0 | -50 | Â 0 | -10 | Width B | 0 | -120 | 0 | -120 | 0 | -25 |
| – | – | – | – | – | Â 2 | Width variation (max.) | 12 | – | 15 | – | – | 5 |
High | Low | High | Low | Â High | Low | Outer Ring Diameter | High | Low | High | Low | High | Low |
0 | -3 | 0 | -3 | Â – | -2 | Mean value of OD (open) Dm | 0 | -8 | 0 | -7 | 0 | -5 |
+1 | -4 | +1 | -4 | Â – | Â -2 | Absolute value of OD (open) D | +2 | -10 | +1 | -8 | 0 | -5 |
+2 | -5 | +2 | -5 | Â – | –Â | Absolute value of OD (closed) D | – | – | – | – | – | – |
6 | – | 4 | Â | Â 2 | Â – | Radial run out (max.) | 15 | – | 8 | – | 5 | – |
0 | -50 | 0 | -50 | Â 0 | Â -10 | Width B | 0 | -120 | 0 | -120 | 0 | -25 |
| – | – | +50 | -10 | Â – | Â – | Flange diameter Df | +125 | -50(1) | +125 | -50(1) | – | – |
| – | – | 0 | -50 | Â – | Â – | Flange width Bf | 0 | -50(1) | 0 | -50(1) | – | – |
(1) Manufacturers tolerances
Table 2Â
Bearings with bore sizes 20-34mm. Outside diameter 31-80mm.Â
Parameters | ISO | |||||||||||
Unit 0.001mm | ||||||||||||
Class 0 | Class 6 | Class 5 | ||||||||||
Inner Ring Diameter | 20-30 | 35-45 | 20-30 | 35-45 | 20-30 | 35-45 | ||||||
High | Low | High | Low | High | Low | High | Low | High | Low | High | Low | |
Mean value of bore dm | 0 | -10 | 0 | 12 | 0 | -8 | 0 | -10 | 0 | -6 | 0 | -8 |
Absolute value of bore d | +3 | -13 | +3 | -15 | +1 | -9 | +1 | -11 | 0 | -6 | – | -8 |
Radial run out (max.) | 13 | – | 15 | – | 8 | – | 10 | – | 4 | – | 5 | – |
Width B | 0 | -120 | 0 | -120 | 0 | -120 | 0 | -120 | 0 | -120 | 0 | -120 |
Width variation (max.) | 20 | – | 20 | – | 20 | – | 20 | – | 5 | – | 5 | – |
Outer Ring Diameter | 32-50 | 52-80 | 32-50 | 52-80 | 32-50 | 52-80 | ||||||
High | Low | High | Low | High | Low | High | Low | High | Low | High | Low | |
Mean value of OD (open) Dm | 0 | -11 | 0 | -13 | 0 | -9 | 0 | -11 | 0 | -7 | 0 | -9 |
Absolute value of OD (open) D | +3 | -14 | +4 | -17 | +2 | -11 | +2 | -13 | 0 | -7 | 0 | -9 |
Absolute value of OD (closed) D | +7 | -18 | +10 | -23 | +6 | -15 | +7 | -18 | – | – | – | – |
Radial run out (max.) | 20 | – | 25 | – | 10 | – | 13 | – | 7 | – | 8 | – |
Width B | 0 | -120 | 0 | -120 | 0 | -120 | 0 | -120 | 0 | -120 | 0 | -120 |
