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 6110-00-301-4841
NSN 2925-00-257-2872
NSN 5945-00-385-3683
NSN 2925-01-109-7177
NSN 6685-01-287-7288
NSN 4140-01-168-3447
NSN 6105-01-371-5861
NSN 5920-01-426-1806
NSN 5920-01-101-2413
NSN 5895-00-036-7257
NSN 5855-01-634-0259
NSN 5985-01-415-2879