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 5855-01-133-3587
NSN 5905-01-196-3557
NSN 2925-00-101-7972
NSN 5965-00-925-1725
NSN 6145-00-005-1018
NSN 6620-01-337-0652
NSN 5905-01-588-4521
NSN 6130-00-289-7050
NSN 5915-00-884-4773
NSN 6240-00-134-2085
NSN 2925-01-132-5827
NSN 4140-01-584-4107