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Grades - Balls - Technical Information - Hobby and Engineering

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.

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Tables and information on this web site should be read as a general guide only. The relevant standards should be consulted to ensure accuracy

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Hobby and Engineering Supplies offers thousands of products including remote controlled cars, planes, boats, and helicopters. We stock spare parts for remote controlled models. Our range includes the popular Solarbotics solar model kits and spares. We also distribute the full range of miniature engineering products from Miniature Bearings Australia. This range includes small bearings, timing pulleys, timing belts, seals, o-rings, gears and more. Also available from our store in Capalaba Queensland are a full range of lubricants, adhesives, balsa wood and plastic rod and sheet materials. See our Online Catalogue for more information. Our main business is handled from our sales counter and showroom at 3239 Old Cleveland Road Capalaba West, Queensland, Australia, but we also sell by phone, fax, online and mail order. We also offer all of our hobby and engineering parts through our online store.

Using the links at the top of this page you will find extensive information including catalogues (Products and Store link), technical data, and other product specific information.

We also suggest that you may want to take a look at the technical information sites - Shafting Information, Couplings Information and Gearboxes Information.

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