An assembly consisting of a roller and stud used to effect a rolling contact with a cam, and convert the reciprocating or oscillating motion to linear motion.
mil-g-23827 mil spec single material response lubrication material document and classification, 0.9995 inches minimum and 1.0010 inches maximum overall outside diameter, 0.3750 inches minimum and 0.3800 inches maximum outer ring width, 1.0370 inches minimum and 1.1090 inches maximum overall length, grease lubrication material