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 5996-01-057-1981
NSN 2925-01-131-0473
NSN 5920-01-652-2866
NSN 2925-01-322-9780
NSN 5920-01-536-3934
NSN 2925-01-508-4138
NSN 5990-01-580-2191
NSN 6145-00-842-9763
NSN 4140-01-518-9107
NSN 5930-01-538-2408
NSN 5990-01-232-6018
NSN 5915-00-711-1820