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 6220-00-491-0520
NSN 6220-01-461-2910
NSN 6135-01-608-3470
NSN 5930-00-884-3373
NSN 5965-00-174-5792
NSN 5920-01-252-5562
NSN 6130-00-827-3537
NSN 5965-00-067-6780
NSN 5935-00-925-8248
NSN 5950-00-007-0922
NSN 5905-00-453-2300
NSN 6105-01-601-8806