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 5910-00-392-6822
NSN 5945-00-681-8330
NSN 5910-01-496-5801
NSN 5996-01-589-7279
NSN 6220-01-550-2373
NSN 7035-01-076-4067
NSN 6145-01-428-2258
NSN 2925-00-139-3231
NSN 7035-01-066-2441
NSN 5960-01-426-4242
NSN 6135-00-182-7008
NSN 5996-01-217-1407