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 5910-01-614-7064
NSN 5915-00-959-5454
NSN 6620-00-553-8988
NSN 5915-00-103-1656
NSN 5975-01-398-2158
NSN 6105-01-433-2204
NSN 6610-01-549-4960
NSN 6145-01-415-6127
NSN 5996-01-045-7004
NSN 4140-01-050-8096
NSN 6320-01-607-0347
NSN 5965-01-438-6928