| Sizes (Diameter) | Tolerances | |||
| Inch | Decimal Inch | Millimeters | Diametrical (In.) | Spherical (In.) |
| 3/32 | .093 | 2.36 | .003 | .003 |
| 1/8 | .125 | 3.18 | .003 | .003 |
| 9/64 | .140 | 3.56 | .003 | .003 |
| 5/32 | .156 | 3.96 | .003 | .003 |
| 3/16 | .187 | 4.75 | .003 | .003 |
| 7/32 | .218 | 5.54 | .003 | .003 |
| 1/4 | .250 | 6.35 | .003 | .003 |
| 5/16 | .312 | 7.94 | .003 | .003 |
| 3/8 | .375 | 9.53 | .003 | .003 |
| 7/16 | .437 | 11.11 | .004 | .005 |
| 1/2 | .500 | 12.70 | .004 | .005 |
| 9/16 | .562 | 14.79 | .004 | .005 |
| Sizes (Diameter) | Tolerances | |||
| Inch | Decimal Inch | Millimeters | Diametrical (In.) | Spherical (In.) |
| 5/8 | .625 | 15.88 | .004 | .005 |
| 3/4 | .750 | 19.05 | .004 | .005 |
| 1 | 1.000 | 25.40 | .004 | .005 |
| 1 1/8 | 1.125 | 28.58 | .006 | .008 |
| 1 1/4 | 1.250 | 31.75 | .008 | .008 |
| 1 3/8 | 1.375 | 34.93 | .008 | .008 |
| 1 1/2 | 1.500 | 38.10 | .008 | .008 |
| 1 5/8 | 1.625 | 41.28 | .010 | .010 |
| 2 | 2.000 | 50.80 | .010 | .010 |
| Diameter of Standard Commercial Grade Balls | ||||||||||||||||||||
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| RMA Class A3 Tolerance | ||||||||||||||||||||||||
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