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 4140-01-080-8268
NSN 4140-01-422-4431
NSN 6320-01-176-8367
NSN 6135-00-318-8359
NSN 5998-00-409-0812
NSN 6145-01-074-1581
NSN 6130-01-087-7321
NSN 5985-01-599-0892
NSN 5975-01-519-4343
NSN 6240-00-677-0305
NSN 5999-01-500-1578
NSN 6650-00-840-9758