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 5935-01-523-6324
NSN 5960-01-343-5912
NSN 2925-01-495-2690
NSN 2925-01-553-5132
NSN 5835-01-389-8218
NSN 5950-00-153-1959
NSN 6105-00-470-4764
NSN 6620-01-179-7259
NSN 7035-01-504-0192
NSN 6620-00-399-0087
NSN 5990-01-419-0661
NSN 5960-01-497-1780