A cylindrical device in which the inner or outer ring turns upon a single or double row of hardened balls which roll easily between the two rings, thus minimizing friction. For items with faces specially ground for duplex mounting see bearing,ball,duplex. Excludes:bearing,ball,airframe.
as modified by afbma standard tolerance designation departure from cited designator, straight bore shape, radial load direction, 0.0020 inches minimum radial and 0.0040 inches maximum radial internal clearance, 11.9992 inches minimum and 12.0000 inches maximum bore diameter