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 5930-00-789-7654
NSN 5935-01-423-9971
NSN 5935-00-555-2633
NSN 6135-01-373-2518
NSN 6105-01-058-3583
NSN 6145-01-388-2642
NSN 5996-01-605-0950
NSN 6220-01-415-4854
NSN 6650-01-003-4144
NSN 5998-01-546-2260
NSN 6110-01-477-3003
NSN 7035-00-490-0485