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 5835-00-503-2608
NSN 5855-01-564-1767
NSN 5990-00-462-9112
NSN 6220-01-372-9226
NSN 5999-01-177-9194
NSN 6145-01-158-2125
NSN 5895-00-203-2379
NSN 6610-01-515-9272
NSN 6240-00-312-0636
NSN 5910-01-233-8233
NSN 2925-00-101-7972
NSN 5935-01-564-9901