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 6150-01-393-7422
NSN 5905-01-487-8868
NSN 6685-01-376-1113
NSN 5925-01-222-1636
NSN 2925-01-523-3607
NSN 5999-01-377-3618
NSN 6240-00-272-8601
NSN 5990-01-411-5930
NSN 5960-01-318-0987
NSN 6145-00-081-6686
NSN 5960-01-022-7322
NSN 5855-00-832-9341