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 5999-01-023-7997
NSN 5930-01-280-1441
NSN 5920-01-360-8310
NSN 6320-01-029-4220
NSN 6685-01-630-3146
NSN 2925-01-455-2558
NSN 5985-01-215-1196
NSN 5895-01-073-0087
NSN 7035-01-138-5781
NSN 5925-01-649-3392
NSN 6685-01-283-9476
NSN 5975-01-551-2626