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 6145-00-940-9555
NSN 2925-01-374-2402
NSN 6240-00-099-8606
NSN 6240-01-145-3931
NSN 5950-01-654-8522
NSN 5930-01-291-1724
NSN 5950-01-569-0504
NSN 5920-00-409-3650
NSN 5895-01-252-2953
NSN 6240-00-052-4592
NSN 5985-01-415-4267
NSN 6610-00-066-9353