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 5895-01-322-1927
NSN 4140-01-060-1438
NSN 5985-01-011-2008
NSN 5990-01-423-7693
NSN 5996-00-452-2187
NSN 5925-01-461-3594
NSN 5935-00-224-4476
NSN 6610-01-479-0466
NSN 6685-00-276-9889
NSN 5925-01-268-8694
NSN 6240-00-607-4303
NSN 5930-01-267-6089