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 5920-01-582-5967
NSN 5990-01-472-2447
NSN 6685-00-184-3894
NSN 5999-01-039-7283
NSN 7035-01-240-0541
NSN 5945-01-121-1589
NSN 5965-01-285-6728
NSN 5925-01-126-8188
NSN 5950-01-178-6306
NSN 7035-01-411-6062
NSN 5999-01-394-8320
NSN 5985-00-149-9414