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 5945-01-428-2682
NSN 5905-01-126-7854
NSN 5996-00-202-6576
NSN 5950-00-520-9539
NSN 6105-01-475-9699
NSN 5990-00-593-5089
NSN 4140-01-540-8638
NSN 5998-01-302-4819
NSN 6110-01-492-3456
NSN 5990-00-153-0055
NSN 6645-00-078-5126
NSN 6645-01-502-3068