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 6610-01-568-0717
NSN 6135-01-400-2947
NSN 5925-01-150-8127
NSN 5996-00-725-2701
NSN 5945-01-532-2614
NSN 5950-01-578-7857
NSN 5960-00-617-6178
NSN 6650-01-152-0665
NSN 6150-01-211-9794
NSN 5855-00-147-2508
NSN 5835-00-233-6327
NSN 5985-00-687-1046