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 5905-01-525-3983
NSN 6145-00-448-1636
NSN 5915-01-456-7988
NSN 6135-00-152-8729
NSN 6685-01-449-0933
NSN 5998-01-407-4720
NSN 6610-00-146-2269
NSN 4140-01-168-0661
NSN 4140-01-100-0743
NSN 5985-01-398-8926
NSN 5965-00-225-1848
NSN 5996-01-389-5822