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 7035-00-631-3782
NSN 5905-01-112-1370
NSN 6320-00-937-5625
NSN 6240-01-033-6941
NSN 6220-01-604-8283
NSN 5905-01-145-4143
NSN 6620-01-384-2105
NSN 5905-01-561-6932
NSN 5996-00-392-7626
NSN 5960-01-233-7667
NSN 5930-01-511-0460
NSN 6105-01-154-5356