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 5985-00-445-5832
NSN 7035-00-541-8516
NSN 6650-01-633-9147
NSN 5835-00-083-6557
NSN 6240-01-040-5530
NSN 5975-01-393-3505
NSN 6645-01-252-8870
NSN 5965-00-263-6436
NSN 5965-01-326-9860
NSN 5915-01-178-6802
NSN 6220-01-311-2531
NSN 5855-01-075-1292