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 5965-01-088-5414
NSN 5990-01-615-7823
NSN 5998-01-593-8351
NSN 5925-01-222-5937
NSN 5905-00-168-4589
NSN 5950-01-360-7057
NSN 5965-00-973-9974
NSN 5998-01-224-6642
NSN 5996-00-800-7628
NSN 5965-01-566-0876
NSN 6110-01-645-6767
NSN 5950-01-262-2342