This is item 53a
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).
Classification: Other ball or roller bearings, including combined ball/roller bearings, nesoi
NSN 5996-01-472-5049
NSN 5835-00-624-1548
NSN 5910-00-120-1100
NSN 2925-01-370-6898
NSN 6610-00-482-2264
NSN 7035-00-470-4977
NSN 5965-01-215-3184
NSN 2925-01-055-7607
NSN 5965-01-561-8862
NSN 6130-00-583-9925
NSN 5915-01-617-8848
NSN 5855-00-908-9314