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 5985-00-547-8642
NSN 5895-01-263-8694
NSN 6105-01-352-0058
NSN 5905-01-030-1741
NSN 5990-01-656-7047
NSN 6610-01-606-2144
NSN 6110-01-063-7423
NSN 6620-01-368-2723
NSN 5965-01-005-0341
NSN 6240-00-225-9702
NSN 6645-01-280-5395
NSN 6320-00-977-3930