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 5895-01-331-1478
NSN 5998-01-607-1067
NSN 2925-00-964-7128
NSN 6650-00-007-4372
NSN 6240-00-472-4635
NSN 6240-00-474-5802
NSN 5935-01-252-0925
NSN 5925-00-156-4044
NSN 4140-01-124-0394
NSN 6145-00-170-7947
NSN 5925-01-643-4905
NSN 6220-00-225-3640