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 5950-00-161-0635
NSN 6105-01-175-6031
NSN 5945-01-605-3053
NSN 5975-01-427-3521
NSN 5835-00-513-9680
NSN 6320-01-449-1014
NSN 5930-01-206-7034
NSN 5915-00-917-7662
NSN 5990-00-165-9195
NSN 6105-01-182-8263
NSN 7035-00-009-8705
NSN 2925-01-540-7389