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 5985-01-438-6682
NSN 6220-01-094-5551
NSN 5965-01-415-2898
NSN 5920-01-475-9132
NSN 5960-01-207-9544
NSN 6685-00-914-9771
NSN 7035-00-142-9076
NSN 5990-01-118-8624
NSN 5985-00-959-3318
NSN 6685-01-211-6590
NSN 6135-01-591-4181
NSN 6220-00-912-8959