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 5999-01-386-2643
NSN 6610-01-379-3647
NSN 5855-00-451-6155
NSN 6145-00-060-0389
NSN 5985-01-427-3734
NSN 2925-00-192-1166
NSN 5999-01-221-6968
NSN 5855-00-337-3679
NSN 5960-00-654-7300
NSN 6685-01-510-2816
NSN 5855-01-147-4785
NSN 6620-00-169-1609