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 5960-01-195-7590
NSN 6110-00-239-9248
NSN 6110-00-250-5949
NSN 6610-00-575-7933
NSN 2925-01-504-3058
NSN 5930-01-542-9182
NSN 7035-00-803-3056
NSN 6150-01-486-4148
NSN 6110-01-409-2692
NSN 7035-00-064-7008
NSN 4140-00-901-6371
NSN 6135-01-026-9960