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 4140-01-161-2741
NSN 5855-01-464-5084
NSN 5996-00-070-4315
NSN 5915-00-406-6460
NSN 6620-01-437-0387
NSN 2925-01-575-7376
NSN 5925-00-959-6075
NSN 6135-01-581-8163
NSN 5999-00-597-0851
NSN 5935-01-443-2996
NSN 5965-00-843-9957
NSN 5920-01-630-5502