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 5925-01-100-3631
NSN 5935-01-007-6472
NSN 5999-00-735-0727
NSN 6645-00-626-5370
NSN 5998-01-038-9500
NSN 6645-00-155-2398
NSN 6650-00-872-0942
NSN 5975-00-545-3548
NSN 6645-00-292-5053
NSN 6145-00-964-7466
NSN 5985-01-411-1946
NSN 6135-00-240-3200