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 4140-01-026-9293
NSN 5965-00-417-8182
NSN 5950-01-567-4000
NSN 6610-00-827-8959
NSN 5920-00-184-2100
NSN 6645-01-340-0892
NSN 5945-01-371-8085
NSN 6610-00-758-3486
NSN 5920-01-179-9739
NSN 5855-01-218-3735
NSN 5905-00-062-7785
NSN 6620-01-523-0713