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 6320-01-092-4101
NSN 5996-01-445-5528
NSN 6610-00-159-1110
NSN 6650-01-525-0958
NSN 6105-00-239-4194
NSN 5996-01-007-2147
NSN 5915-01-008-6268
NSN 5895-01-437-2384
NSN 6220-00-681-2707
NSN 6610-00-552-6332
NSN 6105-00-894-2066
NSN 5935-01-025-4694