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 6645-00-825-5677
NSN 6150-00-518-4558
NSN 5930-00-307-1593
NSN 5990-00-099-0822
NSN 5999-00-952-2442
NSN 6240-00-008-1654
NSN 5895-01-347-6126
NSN 6320-00-115-0883
NSN 5950-00-853-3552
NSN 2925-01-655-4455
NSN 6645-01-400-1137
NSN 6320-01-631-7828