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 6105-00-353-8153
NSN 5960-01-451-6757
NSN 5945-01-464-3531
NSN 5965-01-045-0247
NSN 5945-00-363-9481
NSN 6220-01-420-3392
NSN 6145-01-531-9577
NSN 5960-01-507-9112
NSN 6320-01-029-4220
NSN 5930-01-357-0187
NSN 6220-01-451-3056
NSN 5996-01-349-2140