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 6645-01-413-8003
NSN 5985-01-600-9462
NSN 5835-00-233-6327
NSN 6150-01-359-8598
NSN 5965-01-641-2318
NSN 5910-01-137-4211
NSN 5975-00-185-5243
NSN 6110-01-130-8038
NSN 5945-00-295-6773
NSN 6610-01-611-8787
NSN 6620-01-224-0888
NSN 5996-00-086-2838