An assembled inner component of a tapered roller bearing, consisting of a cone (which provides a contact surface for the rolling elements of the bearing), a complement of tapered rollers (the rolling elements), and frequently a retainer (which spaces the rolling elements).
mrap buffalo mk2a2 end item identification, 2.1250 inches nominal bore diameter, steel overall material, 0.1406 inches nominal cone corner radius, 1.6250 inches nominal cone width