A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 2925-01-200-8757
NSN 5945-01-501-8715
NSN 5925-00-216-8767
NSN 5835-01-022-6362
NSN 6240-01-121-0002
NSN 5895-01-359-8704
NSN 5998-01-544-5722
NSN 6130-01-472-3703
NSN 6135-00-444-1402
NSN 6105-01-615-6840
NSN 5935-01-137-3183
NSN 4140-01-514-8490