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, grease lubrication material, 0.5010 inches maximum overall outside diameter, 0.2760 inches minimum and 0.2810 inches maximum outer ring width, 1.1718 inches nominal overall length