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 6145-01-246-3988
NSN 5935-01-199-2826
NSN 5985-00-882-9761
NSN 5985-00-045-3881
NSN 5920-00-818-1592
NSN 6150-00-683-0621
NSN 5990-01-034-8211
NSN 5915-00-010-7668
NSN 5910-00-099-9998
NSN 5996-00-392-7626
NSN 5910-01-374-3286
NSN 4140-01-274-9320