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 6645-01-462-2101
NSN 6610-01-277-6333
NSN 5945-01-148-8456
NSN 6145-01-293-3754
NSN 5920-00-492-5516
NSN 5835-00-912-5656
NSN 6645-01-447-3143
NSN 5915-01-509-1540
NSN 5895-01-563-4659
NSN 4140-01-391-6462
NSN 5835-01-616-6131
NSN 5999-00-225-8612