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 5960-00-839-8137
NSN 6320-00-422-9006
NSN 5835-01-381-2683
NSN 6135-01-045-1504
NSN 5990-01-106-3786
NSN 6130-00-314-2776
NSN 6240-00-243-0340
NSN 6650-00-266-6808
NSN 5915-00-682-7799
NSN 6135-00-900-2139
NSN 5950-01-046-6288
NSN 5960-00-963-1285