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 5998-01-634-0604
NSN 5950-01-430-3338
NSN 2925-01-182-0227
NSN 5920-01-431-7054
NSN 5965-01-241-0553
NSN 6240-00-909-5473
NSN 5999-01-435-5209
NSN 5945-01-498-8333
NSN 6105-01-517-9596
NSN 5895-01-191-0167
NSN 7035-00-320-5644
NSN 7035-00-803-3056