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 5925-01-526-0133
NSN 5915-00-358-2407
NSN 6240-01-282-6447
NSN 5990-00-529-8767
NSN 5965-01-078-6776
NSN 5835-00-870-7034
NSN 5998-00-839-2179
NSN 6110-01-252-3876
NSN 5895-01-471-6125
NSN 6645-01-386-6311
NSN 6130-00-754-2950
NSN 6650-01-440-2617