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 6620-00-010-1415
NSN 5835-01-238-3381
NSN 5905-01-105-1240
NSN 5998-01-211-6752
NSN 5855-00-444-2298
NSN 5985-01-110-2534
NSN 5965-01-210-7784
NSN 5998-00-419-4882
NSN 6150-01-050-1662
NSN 5915-00-902-5779
NSN 5985-01-085-4408
NSN 5930-01-283-0222