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 5920-01-034-1541
NSN 5998-01-212-3123
NSN 6145-01-208-6876
NSN 5905-01-409-0738
NSN 6150-01-485-8569
NSN 6150-01-322-5379
NSN 6610-01-496-6758
NSN 5935-01-443-3535
NSN 5920-00-862-5820
NSN 5960-00-113-4314
NSN 5895-01-331-8388
NSN 5996-01-430-3960