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 5935-01-524-8067
NSN 6220-01-088-0465
NSN 7035-01-549-6765
NSN 5998-01-291-4302
NSN 5990-01-153-0679
NSN 6620-01-292-5072
NSN 5930-01-057-9247
NSN 6650-00-539-7298
NSN 6320-01-547-2743
NSN 6650-01-444-2152
NSN 5935-00-947-6570
NSN 5910-00-420-7250