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 5990-00-179-2576
NSN 5950-01-320-0497
NSN 6145-01-271-4565
NSN 5975-01-370-5279
NSN 2925-01-327-3069
NSN 5975-00-610-2454
NSN 6135-00-182-7008
NSN 6620-01-555-1453
NSN 6240-01-189-9339
NSN 5895-00-072-7709
NSN 6610-00-119-1591
NSN 6610-00-186-9180