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 5985-01-424-2923
NSN 5935-01-416-6663
NSN 2925-00-642-8854
NSN 5960-00-597-2680
NSN 5920-01-084-5118
NSN 5960-00-726-0161
NSN 5920-00-130-3593
NSN 5965-01-306-6527
NSN 6620-01-287-9975
NSN 6240-01-142-2963
NSN 2925-01-131-8761
NSN 5905-00-084-1193