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 5895-01-566-9459
NSN 5996-00-257-8628
NSN 5835-00-823-6116
NSN 5920-01-252-8660
NSN 5975-00-558-2495
NSN 5985-01-578-6915
NSN 5985-00-903-0779
NSN 5950-01-250-3687
NSN 5999-01-391-6748
NSN 6130-01-290-3310
NSN 5905-00-752-7360
NSN 6240-01-178-4582