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 5998-01-316-5716
NSN 5895-01-648-9990
NSN 6320-00-310-1080
NSN 6240-01-556-7096
NSN 6240-00-991-6929
NSN 6240-01-075-9397
NSN 4140-01-579-1286
NSN 6610-00-824-3376
NSN 5990-01-481-3080
NSN 6145-01-379-6140
NSN 4140-01-620-2498
NSN 7035-01-327-4017