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 5945-00-155-4290
NSN 5975-01-505-4066
NSN 5950-00-914-6456
NSN 5920-01-058-7648
NSN 5998-01-222-1614
NSN 6105-01-144-8441
NSN 5960-01-089-8155
NSN 5985-01-420-2655
NSN 6320-01-578-6006
NSN 6610-00-178-9808
NSN 6650-01-080-8731
NSN 6620-01-424-6925