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 6650-00-236-0724
NSN 6320-01-176-8367
NSN 5965-00-529-0602
NSN 5975-01-447-5962
NSN 6610-01-592-8642
NSN 5998-01-462-0025
NSN 5920-00-004-6372
NSN 5905-01-197-5921
NSN 6650-00-734-3985
NSN 5920-01-110-9242
NSN 5996-01-049-0851
NSN 4140-00-924-2931