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 5835-00-554-0399
NSN 6320-01-372-8671
NSN 5975-01-055-2290
NSN 6135-01-530-8136
NSN 5945-00-707-3384
NSN 6685-01-180-9037
NSN 6645-01-324-5621
NSN 6135-01-140-8201
NSN 5920-01-132-9395
NSN 5930-01-023-8602
NSN 6685-01-525-6231
NSN 6650-00-530-1880