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 6220-01-248-0158
NSN 5999-01-023-1578
NSN 5915-00-981-9294
NSN 6240-01-485-7739
NSN 6105-01-197-9632
NSN 6620-00-679-5830
NSN 5945-01-577-0307
NSN 5930-00-196-7311
NSN 5835-00-312-8596
NSN 5945-01-072-1459
NSN 6220-01-191-5703
NSN 6650-00-416-2953