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 5985-00-494-8548
NSN 5920-01-265-7679
NSN 5930-00-518-1642
NSN 6220-01-175-1246
NSN 5905-00-583-2894
NSN 5965-01-495-3772
NSN 5905-00-597-3000
NSN 6145-00-132-4800
NSN 5998-01-607-1147
NSN 6145-01-517-6708
NSN 6105-00-578-8114
NSN 5895-01-605-4413