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 6620-01-423-7300
NSN 6240-01-252-8850
NSN 6610-01-214-5906
NSN 6145-00-753-2264
NSN 5975-01-401-5355
NSN 5998-01-427-2327
NSN 6135-00-995-1089
NSN 5835-01-495-0595
NSN 6240-01-227-4178
NSN 2925-00-991-9223
NSN 6620-00-398-0320
NSN 6135-01-586-5018