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 4140-01-309-4926
NSN 6135-01-560-3173
NSN 5998-00-196-0528
NSN 5835-00-435-1428
NSN 6150-01-317-3639
NSN 2925-00-753-8598
NSN 6135-01-348-4056
NSN 5930-00-281-4686
NSN 5925-01-145-4565
NSN 4140-01-174-9335
NSN 5835-01-471-5848
NSN 5855-01-085-5354