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)

  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.

See also


You can find balls in the Small Parts and Bearings Balls Online Catalogue pages.


For a huge range of bearings online please visit the Bearing Shop Online Website.

Hobby and Engineering Supplies lists a smaller range of products and only the most popular items in each range. They also list many additional hobby specific categories.

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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