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 5855-01-658-4510
NSN 6135-01-156-4627
NSN 6130-00-525-9975
NSN 5996-01-440-9660
NSN 5996-01-451-5715
NSN 6135-01-010-0891
NSN 6320-01-452-2394
NSN 5985-00-912-8937
NSN 6645-01-229-3369
NSN 6130-01-278-6406
NSN 5985-00-361-8863
NSN 6610-00-288-5655