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 5998-01-005-2128
NSN 6685-01-440-5271
NSN 5910-00-764-7649
NSN 2925-00-902-3881
NSN 5915-01-495-7677
NSN 5835-01-352-7211
NSN 5895-01-502-6988
NSN 5998-00-741-2321
NSN 5935-01-035-6765
NSN 5855-01-007-9541
NSN 5950-00-493-3762
NSN 6130-01-287-9841