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 5990-00-232-3965
NSN 5925-00-466-6934
NSN 6150-01-275-8463
NSN 5855-01-488-6571
NSN 6150-01-503-0536
NSN 6135-00-866-2311
NSN 5998-01-604-5986
NSN 5905-00-046-5117
NSN 5835-01-406-4066
NSN 6610-01-398-8092
NSN 5996-01-227-1605
NSN 5945-01-617-0404