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 6620-00-557-5559
NSN 6220-01-538-7194
NSN 5996-00-026-9118
NSN 5996-01-429-0390
NSN 5855-01-256-2551
NSN 6220-01-572-5442
NSN 5998-00-753-1581
NSN 6645-01-645-2767
NSN 2925-00-008-5485
NSN 5960-00-602-9906
NSN 5999-01-528-8294
NSN 4140-01-004-8424