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 4140-00-373-0740
NSN 6145-00-730-1545
NSN 6645-01-590-2759
NSN 5998-00-234-2494
NSN 5905-00-453-9884
NSN 6620-01-299-4563
NSN 5930-00-443-4784
NSN 6240-00-548-0209
NSN 6145-01-222-0907
NSN 5996-01-364-0207
NSN 5950-01-246-3984
NSN 4140-00-244-2365