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 4140-01-481-7738
NSN 5925-01-246-6915
NSN 6110-01-144-9744
NSN 5960-01-383-6262
NSN 6130-01-548-1030
NSN 5930-01-383-8189
NSN 5950-00-138-7789
NSN 5835-01-515-6537
NSN 6150-01-069-0927
NSN 5930-01-492-0895
NSN 5915-01-020-6509
NSN 5996-01-371-2958