Industry Standard Grade 100 Hardened Steel Ball Bearings: High Quality Graded Hardened Chrome Steel Ball bearings made from Chromium AISI 52100 steel. Hardened to 60-67 Rockwell Scale equivalent to 700-900 HV (Vickers Scale) and are hardened all the way through the ball. These are the same hardened steel balls used to manufacture bearing assemblies and have a high duty and life cycle. |
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GRADES |
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Grade |
Diameter Tolerance Per Ball |
Sphericity | Diameter Tolerance per Unit Container | Diameter Tolerance | Max Surface Roughness |
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- |
Inch |
µ |
Inch |
µ |
Inch |
µ |
Inch |
µ |
Inch |
µ |
3 |
0.000003 |
0.076 |
0.000003 |
0.076 |
0.000005 |
0.127 |
±.00003 |
±0.076 |
0.5 |
0.013 |
5 |
0.000005 |
0.127 |
0.000005 |
0.127 |
0.000001 |
0.25 |
±.000005 |
±0.127 |
0.8 |
0.02 |
10 |
0.00001 |
0.25 |
0.00001 |
0.25 |
0.00002 |
0.51 |
±.0001 |
±2.5 |
1 |
0.025 |
15 |
0.000015 |
0.38 |
0.000015 |
0.38 |
0.00003 |
0.76 |
±.0001 |
±2.5 |
1.2 |
0.03 |
25 |
0.000025 |
0.63 |
0.000025 |
0.63 |
0.00005 |
1.27 |
±.0001 |
±2.5 |
1.5 |
0.038 |
50 |
0.00005 |
1.27 |
0.00005 |
1.27 |
0.0001 |
2.5 |
±.0002 |
±5 |
3 |
0.075 |
100 |
0.0001 |
2.5 |
0.0001 |
2.5 |
0.0002 |
5 |
±.0005 |
±5 |
5 |
0.125 |
200 |
0.0002 |
5 |
0.0002 |
5 |
0.0004 |
10 |
±.0010 |
±10 |
8 |
0.2 |
300 |
0.0003 |
7.5 |
0.0003 |
7.5 |
0.0006 |
15 |
±.0015 |
±37.5 |
Not applicable |
Not applicable |
500 |
0.0005 |
12.5 |
0.0005 |
12.5 |
0.001 |
25 |
±.002 |
±50 |
Not applicable |
Not applicable |
1000 |
0.001 |
25 |
0.001 |
25 |
0.002 |
50 |
±.005 |
±125 |
Not applicable |
Not applicable |
2000 |
0.002 |
50 |
0.002 |
50 |
0.004 |
100 |
±.005 |
±125 |
Not applicable |
Not applicable |
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