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 5910-01-557-7597
NSN 5935-00-160-3876
NSN 5975-00-244-6118
NSN 6110-00-880-6376
NSN 5915-00-258-0031
NSN 5998-01-457-3804
NSN 6130-01-658-2217
NSN 6130-01-367-2201
NSN 5999-01-368-0076
NSN 6105-00-575-9720
NSN 5998-00-727-4264
NSN 4140-01-350-3277