Precision & Sizing Balls
We have been a supplier of loose bearing balls for almost 100 years. These balls can be supplied in accordance with the applicable Mil Spec with chemical and physical certifications if required. They are available in all grades, sizes and materials, including chrome steel, stainless steel, carbon steel, brass, bronze, tungsten carbide, aluminium, K-Monel, glass, plastic and ceramic. Grades range from Grade 3 to Grade 1000. We stock a large inventory of precision sizing balls, ranging in size from 1/64″ to over 1″ in diameter and everything in between, carried out to as many as 5 decimal places. Most are available for immediate delivery.
The following table is taken from the ABMA Standards and may serve as a general guide for quality specifications:
Grade |
Deviation From Spherical Form |
Surface Roughness Arithmetrical Average |
Basic Diameter Tolerance |
3 |
3µ” .000003″ |
5µ” AA .0000005″ AA |
± 30µ ± .000030″ |
5 |
5µ” .000005″ |
8µ” AA .0000008″ AA |
± 50µ ± .000050″ |
10 |
10µ” .000010″ |
1µ” AA .000001″ AA |
± 100µ ± .0001″ |
24 |
24µ” .000024″ |
2µ” AA .000002″ AA |
± 100µ ± .0001″ |
48 |
48µ” .000048″ |
3µ” AA .000003″ AA |
± 200µ ± .0002″ |
50 |
50µ” .000050″ |
3µ” AA .000003″ AA |
± 300µ ± .0003″ |
100 |
100µ” .0001″ |
5µ” AA .000005″ AA |
± 500µ ± .0005″ |