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 6320-00-222-1468
NSN 6220-01-366-4242
NSN 5996-01-449-0666
NSN 5945-01-251-8020
NSN 5985-01-278-0341
NSN 6110-00-212-6683
NSN 6240-01-437-4936
NSN 5950-00-096-3422
NSN 6105-01-387-8294
NSN 5930-00-221-5070
NSN 5960-01-378-1729
NSN 2925-00-992-7904