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 6145-00-620-5922
NSN 6240-00-479-5057
NSN 6110-00-627-9710
NSN 5998-01-316-7280
NSN 5835-00-177-2970
NSN 5996-01-525-7628
NSN 5855-01-038-2189
NSN 6110-01-341-5348
NSN 5996-01-106-2763
NSN 6145-00-648-2726
NSN 5855-01-551-7923
NSN 6105-01-516-3392