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 6240-00-389-4822
NSN 5855-01-573-8397
NSN 5935-00-542-3634
NSN 6650-00-469-6682
NSN 5996-00-819-0389
NSN 5855-00-327-2061
NSN 5925-00-421-3012
NSN 6130-01-108-6197
NSN 5905-01-232-5593
NSN 5990-00-698-3963
NSN 5965-01-499-9699
NSN 5835-01-592-2350