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 5895-01-524-0670
NSN 6610-01-374-0569
NSN 5915-01-010-3866
NSN 6685-00-828-1521
NSN 5998-00-277-7552
NSN 5855-01-400-1590
NSN 5996-01-134-1566
NSN 5996-00-553-7348
NSN 6650-01-554-7322
NSN 5910-00-227-9795
NSN 6610-00-690-2704
NSN 6135-01-463-2445