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 5996-01-485-7918
NSN 5999-01-359-9066
NSN 6145-01-209-9562
NSN 5855-01-191-3404
NSN 6105-01-544-7575
NSN 7035-00-870-0290
NSN 6645-00-559-3623
NSN 5925-00-399-1120
NSN 5945-00-316-5300
NSN 5935-00-470-9571
NSN 5920-01-212-1536
NSN 5925-00-067-3814