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 6650-01-375-4769
NSN 4140-01-005-0154
NSN 6645-00-819-5045
NSN 5975-01-534-2773
NSN 5930-01-337-7019
NSN 5990-00-513-5328
NSN 6220-00-660-5539
NSN 5905-01-323-7926
NSN 7035-00-188-6674
NSN 5895-01-533-0144
NSN 6645-01-060-7988
NSN 6110-01-417-7017