A cylindrical body having a centrally located hole to accommodate a pin or shaft for attachment to a push rod guide, yoke, rocker arm, turntable, or rail. The item provides a rolling contact with the face of a valve stem, or the lobes of a cam ring or camshaft on engines, fuel injection pumps, latches, turntables, parallel bearing surfaces requiring a roller support, and the like. Excludes:bearing, roller, cylindrical; roller, electrical switch; and friction bearings. See also cam follower, needle bearing.
qq-a-268, t4 fed spec single material response material document and classification, 3.960 inches minimum and 4.040 inches maximum outside diameter, not casehardened casehardening indicator, 3.146 inches minimum and 3.166 inches maximum bore length, 1.250 inches minimum and 1.251 inches maximum bore inside diameter