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 5855-01-203-4719
NSN 2925-00-056-7112
NSN 6620-01-557-0583
NSN 5999-01-388-8552
NSN 6105-00-525-8559
NSN 6220-00-264-9473
NSN 6645-00-445-8143
NSN 6320-01-233-5798
NSN 5910-01-580-0583
NSN 5915-00-473-2112
NSN 6110-00-155-4303
NSN 4140-00-449-7345