Grades - Balls - Technical
Ball Precision Grades
AFBMA standards govern various the dimensional tolerances of balls. The main factors affecting ball performance are ovality (out of roundness) and the actual diametrical tolerances. These standards are listed below.
Ball Grades (AFBMA) (Metallic Balls) |
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| Ovality Per Ball | Diametrical Tolerance | |||
| mm | Inches | mm | Inches | |
| Grade 3 | +/- 0.000076 | +/- 0.000003 | +/- 0.000762 | +/- 0.00003 |
| Grade 5 | +/- 0.000127 | +/- 0.000005 | +/- 0.001270 | +/- 0.00005 |
| Grade 10 | +/- 0.000254 | +/- 0.000010 | +/- 0.00254 | +/- 0.00010 |
| Grade 20 | +/- 0.000508 | +/- 0.000020 | +/- 0.00508 | +/- 0.00020 |
| Grade 25 | +/- 0.000635 | +/- 0.000025 | +/- 0.00635 | +/- 0.00025 |
| Grade 40 | +/- 0.001016 | +/- 0.000040 | +/- 0.01016 | +/- 0.00040 |
| Grade 50 | +/- 0.001270 | +/- 0.000050 | +/- 0.01270 | +/- 0.00050 |
| Grade 100 | +/- 0.002540 | +/- 0.000100 | +/- 0.025400 | +/- 0.00100 |
| Grade 200 | +/- 0.005080 | +/- 0.000200 | +/- 0.050800 | +/- 0.00200 |
| Grade 500 | +/- 0.012700 | +/- 0.000500 | +/- 0.050800 | +/- 0.00200 |
| Grade 1000 | +/- 0.025400 | +/- 0.001000 | +/- 0.127000 | +/- 0.00500 |
| Grade 2000 | +/- 0.050800 | +/- 0.002000 | +/- 0.127000 | +/- 0.00500 |
These tables should be read as a general guide only. The relevant standards should be consulted to check accuracy.
Ball Grades (Plastic) |
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| Ovality Per Ball | Diametrical Tolerance | |||
| mm | Inches | mm | Inches | |
| Grade 0 | +/- 0.0127 | +/- 0.0005 | +/- 0.0127 | +/- 0.0005 |
| Grade I | +/- 0.0127 | +/- 0.0005 | +/- 0.0254 | +/- 0.0010 |
| Grade IIP | +/- 0.0254 | +/- 0.0010 | +/- 0.0508 | +/- 0.0020 |
| Grade II | +/- 0.0254 | +/- 0.0010 | +/- 0.0508 | +/- 0.0020 |
| Grade III | +/- 0.1270 | +/- 0.0050 | +/- 0.1270 | +/- 0.0050 |
These tables should be read as a general guide only. The relevant standards should be consulted to check accuracy.
See also
You can find balls in the Hobby and Engineering Supplies Balls Online Catalogue pages.
For a huge range of bearings online please visit the Bearing Shop Online Website.
The Small Parts and Bearings has a much larger range of engineering supplies.
For the best range of miniature and small bearings please try the Miniature Bearings Australia website. Miniature Bearings Australia also list a large variety of miniature engineering products.
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