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 6105-01-365-1386
NSN 6620-01-258-6209
NSN 5905-01-568-2450
NSN 6240-00-655-2523
NSN 5895-01-399-0240
NSN 6240-01-381-2275
NSN 4140-01-136-0169
NSN 6105-00-794-0255
NSN 5945-00-061-9799
NSN 5996-01-076-2938
NSN 6685-01-571-0808
NSN 5835-01-422-7393