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 4140-00-833-6239
NSN 5855-01-544-7264
NSN 6685-01-254-3014
NSN 5930-01-471-6822
NSN 5945-01-154-3594
NSN 6610-00-244-9142
NSN 6150-00-591-7994
NSN 5965-01-539-7345
NSN 5975-01-146-4796
NSN 5998-00-583-5541
NSN 5998-00-028-6920
NSN 6620-01-475-4717