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.
20.0 millimeters nominal bore diameter, 0.0005 inches minimum radial and 0.0008 inches maximum radial internal clearance, 25.0 degrees nominal contact angle, straight bore shape, rigid alignment type