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 6220-01-132-8913
NSN 6110-01-113-7642
NSN 5835-01-632-6627
NSN 6240-00-553-8891
NSN 5998-00-381-9720
NSN 6620-00-270-3275
NSN 5855-00-256-5562
NSN 6135-00-497-0491
NSN 5965-01-359-5501
NSN 6220-01-047-7325
NSN 6220-01-397-2524
NSN 6620-01-643-6817