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 5915-01-649-9281
NSN 6220-00-252-0702
NSN 5990-01-419-0661
NSN 6105-00-409-9228
NSN 6130-00-702-0402
NSN 5990-01-472-2447
NSN 5925-01-455-6400
NSN 5835-00-821-8555
NSN 5960-01-016-4126
NSN 6110-01-367-2165
NSN 6110-00-782-1174
NSN 6685-01-503-6537