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 5965-00-070-8520
NSN 5999-01-013-4874
NSN 6105-01-301-8528
NSN 6110-01-480-0713
NSN 5985-01-609-5562
NSN 6145-01-211-7577
NSN 5895-01-444-0700
NSN 5950-01-607-8566
NSN 5965-00-891-2778
NSN 6620-00-209-0767
NSN 5996-01-331-1432
NSN 6130-01-282-2326