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 5935-00-074-3721
NSN 5990-01-550-7827
NSN 6220-01-339-2312
NSN 5855-01-389-3091
NSN 5975-00-981-2486
NSN 6150-01-582-5167
NSN 5930-01-067-9253
NSN 5910-00-248-4039
NSN 5998-01-350-3652
NSN 6110-01-463-2597
NSN 5998-01-381-1830
NSN 5975-01-092-4512