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 6620-01-030-0525
NSN 5996-00-292-2624
NSN 6650-01-112-0453
NSN 5920-01-267-1417
NSN 5935-01-359-8956
NSN 5945-01-065-0887
NSN 5905-00-144-8181
NSN 5945-00-548-8818
NSN 6645-01-062-0905
NSN 5999-01-023-9897
NSN 7035-00-945-3166
NSN 6685-01-270-5613