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 5895-01-244-7434
NSN 6650-01-384-6595
NSN 5960-01-268-8674
NSN 5920-01-565-5744
NSN 5998-00-518-5418
NSN 5996-01-481-2630
NSN 5925-00-984-9125
NSN 5975-00-256-1486
NSN 5965-01-659-2126
NSN 5975-01-543-6602
NSN 6320-01-390-5385
NSN 5895-00-932-1577