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 6130-01-155-3137
NSN 4140-01-619-6859
NSN 5935-01-428-3928
NSN 6620-01-029-3705
NSN 5920-00-391-6252
NSN 6110-00-867-5580
NSN 4140-01-634-0330
NSN 6620-01-448-0572
NSN 5945-01-229-7535
NSN 6620-00-663-8962
NSN 5835-01-355-0308
NSN 5996-01-194-8117