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 7035-00-574-4223
NSN 5996-01-310-6240
NSN 5985-00-221-5566
NSN 5905-00-518-2666
NSN 5910-01-568-0081
NSN 6240-00-978-9752
NSN 5996-01-006-4262
NSN 6320-01-459-6992
NSN 6610-01-018-2431
NSN 6645-01-452-9495
NSN 6135-00-866-2311
NSN 6145-01-130-1252