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 6135-01-507-4346
NSN 6320-01-422-1212
NSN 5998-00-083-7311
NSN 5935-00-877-5142
NSN 6650-00-879-5834
NSN 5985-01-331-8710
NSN 6150-01-623-1156
NSN 5920-01-113-8048
NSN 5935-00-149-0618
NSN 6130-01-082-4187
NSN 5960-01-472-9562
NSN 6650-00-730-0371