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 5910-01-100-3390
NSN 6685-00-403-1226
NSN 5915-01-029-3612
NSN 5999-01-391-9479
NSN 5930-01-359-9050
NSN 6110-00-181-9544
NSN 5985-01-408-4677
NSN 6320-01-406-6098
NSN 5895-01-143-5443
NSN 4140-01-263-0665
NSN 5960-00-837-5146
NSN 2925-01-063-7876