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 5990-01-434-7913
NSN 5985-01-188-6997
NSN 5855-00-797-8217
NSN 5905-01-594-6534
NSN 5960-00-116-7508
NSN 5905-01-602-9868
NSN 5996-01-235-1643
NSN 5920-01-425-5700
NSN 6240-01-502-7883
NSN 5895-01-352-3083
NSN 4140-01-598-8969
NSN 5998-00-291-6818