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 6130-01-233-4074
NSN 5985-01-578-2216
NSN 2925-01-462-1620
NSN 5935-01-650-8940
NSN 6220-00-003-3355
NSN 5950-00-495-5214
NSN 5915-01-352-5810
NSN 6135-01-503-1688
NSN 6645-01-592-2557
NSN 5935-01-308-6664
NSN 6620-01-265-0632
NSN 5835-00-233-6327