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 5935-00-993-2752
NSN 5975-01-094-6250
NSN 5855-01-218-3735
NSN 5835-01-469-6706
NSN 6650-01-508-3651
NSN 5935-01-375-1263
NSN 4140-00-509-2389
NSN 6150-00-332-8332
NSN 5998-00-191-9833
NSN 6240-00-518-2400
NSN 2925-01-548-6674
NSN 6240-01-469-2957