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 7035-00-179-3924
NSN 6150-00-335-7189
NSN 5998-01-133-9402
NSN 5910-01-450-4255
NSN 6320-00-036-3688
NSN 4140-00-484-4040
NSN 6620-01-607-5738
NSN 5915-01-041-1373
NSN 5998-01-103-2131
NSN 5835-01-026-0670
NSN 6620-00-897-3182
NSN 5910-01-564-4139