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.
ball,0.3125 part name assigned by controlling agency, 1940-01-526-7164;mk3 bridge erection boat end item identification