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 6145-01-068-6851
NSN 5950-01-289-4890
NSN 5965-01-289-3509
NSN 6105-00-099-8818
NSN 6645-01-408-4576
NSN 5835-01-647-6426
NSN 5855-01-364-9810
NSN 6650-01-463-1894
NSN 6110-01-372-0095
NSN 5975-01-634-0678
NSN 5945-01-634-0588
NSN 4140-00-078-9357