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 6135-01-484-8637
NSN 6240-01-604-9172
NSN 5905-00-061-7427
NSN 5990-01-044-4767
NSN 5996-01-437-3998
NSN 5965-00-439-6287
NSN 5996-01-442-0652
NSN 5998-01-088-8239
NSN 5985-01-229-0607
NSN 5925-01-641-2879
NSN 6135-00-891-4944
NSN 2925-01-348-3206