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 5910-00-243-1057
NSN 5930-01-365-6928
NSN 5855-01-413-8962
NSN 5925-01-040-7470
NSN 2925-01-346-9522
NSN 6650-00-561-3762
NSN 5930-01-168-9901
NSN 6130-01-347-5726
NSN 5855-01-301-0158
NSN 6105-01-646-3832
NSN 5835-00-391-8655
NSN 5920-01-410-7343