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 5960-01-323-6432
NSN 5975-01-420-6591
NSN 6220-00-458-2160
NSN 5950-01-626-8931
NSN 5895-00-445-2821
NSN 6620-00-170-5296
NSN 5920-01-224-0355
NSN 5975-01-107-5884
NSN 5999-01-271-4124
NSN 5998-01-092-0036
NSN 5990-01-048-1056
NSN 6145-01-389-4350