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 7035-00-392-5417
NSN 5998-01-391-1702
NSN 5996-01-354-2833
NSN 5960-00-136-7046
NSN 6110-01-300-9493
NSN 4140-01-250-4896
NSN 6240-01-500-9461
NSN 5998-01-278-8248
NSN 6650-01-395-5225
NSN 6320-01-249-3236
NSN 5996-01-437-7234
NSN 5855-01-530-3172