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 5945-01-181-7340
NSN 5950-01-419-3417
NSN 2925-00-156-8963
NSN 5945-00-144-8073
NSN 6110-01-415-6545
NSN 5920-01-083-9912
NSN 5996-00-316-3386
NSN 5975-01-236-1428
NSN 6620-00-115-7620
NSN 5835-01-596-9908
NSN 5935-01-499-1488
NSN 5998-00-400-5925