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 6610-00-023-0076
NSN 2925-01-064-3729
NSN 5998-01-556-4250
NSN 6620-01-385-1767
NSN 5895-01-602-2412
NSN 6610-00-126-6163
NSN 6240-01-579-3758
NSN 6220-01-219-6294
NSN 6650-01-354-3363
NSN 5905-01-184-1442
NSN 6240-01-249-7259
NSN 5835-00-337-7801