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 5925-00-284-3726
NSN 5920-01-270-4562
NSN 5915-00-597-2369
NSN 6685-01-247-0470
NSN 5935-01-085-4977
NSN 5996-01-482-5955
NSN 6145-00-862-7069
NSN 5996-01-104-1851
NSN 5835-00-834-1286
NSN 6110-00-444-6939
NSN 4140-01-592-3151
NSN 5960-01-215-0992