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 6105-01-113-7039
NSN 5990-01-199-2846
NSN 6110-01-137-5934
NSN 4140-00-231-9559
NSN 6220-00-623-6473
NSN 5925-01-618-1529
NSN 5990-00-821-6257
NSN 6105-01-649-9136
NSN 5920-01-383-7003
NSN 6610-01-278-9387
NSN 5930-00-161-0601
NSN 5920-00-986-3922