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 6135-00-209-6918
NSN 6240-00-064-4064
NSN 6610-01-593-0135
NSN 5965-00-905-7561
NSN 5985-00-478-0744
NSN 6650-00-375-6632
NSN 6105-00-869-6642
NSN 5965-01-655-5965
NSN 6320-01-643-0850
NSN 6150-01-534-4557
NSN 5930-01-247-6545
NSN 5930-01-250-2780