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 5835-01-095-8851
NSN 5920-01-151-7888
NSN 5930-01-651-8097
NSN 6320-01-255-2096
NSN 5996-01-426-8531
NSN 5935-01-447-6217
NSN 5975-01-039-9750
NSN 6685-01-581-6875
NSN 5920-01-564-3692
NSN 6240-01-175-2046
NSN 2925-01-650-3412
NSN 5990-01-183-6478