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 6650-00-103-0314
NSN 5930-01-322-2629
NSN 5950-01-400-5942
NSN 6220-01-126-1909
NSN 6145-00-469-8657
NSN 6110-01-419-0045
NSN 6110-01-400-4207
NSN 5999-00-499-8949
NSN 6620-00-115-9050
NSN 5915-01-495-3675
NSN 2925-00-915-1827
NSN 5960-01-104-7839