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 6650-00-221-7119
NSN 5920-01-554-4832
NSN 5960-01-473-9203
NSN 5960-01-425-1454
NSN 5895-01-468-6215
NSN 6150-01-410-8566
NSN 5996-01-006-2324
NSN 6240-01-572-6003
NSN 5855-01-606-9511
NSN 6645-01-400-2119
NSN 5965-01-545-7877
NSN 6610-00-225-9886