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 5910-00-275-8283
NSN 6320-00-110-8005
NSN 6135-01-116-3385
NSN 6620-01-014-7192
NSN 6320-01-631-7828
NSN 5920-01-554-5395
NSN 2925-01-100-3694
NSN 5945-01-649-7977
NSN 6320-00-790-4844
NSN 6150-01-134-2029
NSN 5965-00-836-2690
NSN 5960-00-254-4271