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 6110-01-320-3849
NSN 6135-01-265-1384
NSN 5915-01-345-3829
NSN 5855-00-925-0114
NSN 5835-01-595-4099
NSN 5950-01-634-0677
NSN 5985-01-114-7247
NSN 5985-00-376-1852
NSN 5950-01-260-2107
NSN 5910-00-216-8081
NSN 5990-01-386-5561
NSN 5998-00-883-2628