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 6150-01-603-8699
NSN 6240-00-231-0761
NSN 5990-01-065-0492
NSN 5990-01-619-0935
NSN 5920-01-211-5557
NSN 5999-01-411-6126
NSN 6620-01-207-0667
NSN 5935-01-099-9004
NSN 5915-01-284-8905
NSN 5945-01-182-6624
NSN 6220-01-446-5582
NSN 6320-01-322-8340