ABMA 12.1:1992 (R2010)

Covers the characteristics that define the requirements of precision and super-precision instrument ball bearings. It establishes their boundary dimensions, tolerances, internal clearances, and classification for selective assembly. The recommended practices for gauging, frictional torque determination, load rating determination, operational life prediction and yield rate limitation are provided. All components covered by this Standard are designed to S.I. (metric) dimentions and are presented in Part 1 of the tables provided. The equivalent U.S. Customary (inch) dimentions shown in Part 2 of the Tables are provided for the convenience of those using that system.