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 4140-01-596-6832
NSN 5855-01-400-1590
NSN 5920-01-581-0015
NSN 6150-01-625-1120
NSN 5990-01-092-1963
NSN 5975-00-231-2985
NSN 6650-00-958-7408
NSN 6610-00-816-4998
NSN 6320-01-072-2073
NSN 5835-00-106-2120
NSN 6220-00-276-8681
NSN 5835-01-128-9331