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 6130-01-430-9573
NSN 5998-00-007-1977
NSN 4140-00-391-0879
NSN 2925-01-467-1192
NSN 5975-01-206-4055
NSN 5915-01-230-0857
NSN 7035-01-505-3286
NSN 6110-00-089-6175
NSN 5996-00-205-2933
NSN 5930-00-912-6211
NSN 5920-00-566-7047
NSN 6150-00-280-4500