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 5920-01-176-1413
NSN 6105-00-738-6699
NSN 5965-01-542-8510
NSN 5905-01-425-7065
NSN 5950-01-299-5945
NSN 7035-01-579-4897
NSN 5950-00-475-8302
NSN 5935-01-359-4185
NSN 5960-01-080-8451
NSN 5996-00-281-4500
NSN 5930-01-168-2261
NSN 6650-00-455-9457