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 6110-01-531-9621
NSN 6145-00-705-6686
NSN 6105-01-308-8055
NSN 5835-01-250-2939
NSN 5920-00-960-0199
NSN 6320-01-352-8084
NSN 5950-01-630-9444
NSN 2925-01-642-0944
NSN 5935-01-462-5430
NSN 5935-01-558-6757
NSN 2925-01-627-6568
NSN 6240-01-176-9037