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 5950-00-762-0844
NSN 5985-01-580-2614
NSN 5998-00-082-3396
NSN 6240-01-146-4839
NSN 6650-01-073-5458
NSN 6150-00-360-1508
NSN 5935-01-339-4619
NSN 5935-01-124-4634
NSN 6145-00-963-3944
NSN 5935-01-027-4355
NSN 5895-01-557-2899
NSN 5950-01-478-7381