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 6145-01-432-2440
NSN 6240-01-459-0902
NSN 4140-01-116-8141
NSN 2925-01-424-0235
NSN 5905-01-569-3918
NSN 6220-01-589-0724
NSN 2925-01-331-5039
NSN 5930-01-242-4108
NSN 5855-01-594-7809
NSN 6110-01-056-4964
NSN 5998-01-211-2858
NSN 5975-00-807-9527