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 2925-01-631-7004
NSN 6685-01-081-0365
NSN 5985-00-083-6081
NSN 5925-00-133-2963
NSN 6320-00-394-8458
NSN 5930-01-338-3757
NSN 5990-01-068-1651
NSN 5950-00-305-4783
NSN 7035-01-260-0804
NSN 6620-00-391-7858
NSN 5920-00-561-1309
NSN 5920-01-321-7745