A soft metal or nonmetal sleeve, designed to mate with a pin-rivet. it may include an external wrenching facility which breaks off at a perdetermined torque to form a head.
NSN 6220-01-399-4364
NSN 5920-00-709-7835
NSN 5999-00-996-7251
NSN 6135-01-069-2482
NSN 5985-01-254-9744
NSN 5960-00-343-0852
NSN 5920-01-265-0718
NSN 7035-00-286-6221
NSN 5985-00-131-0834
NSN 6320-01-170-4068
NSN 5985-01-014-4924
NSN 6620-01-628-2620