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 5996-01-051-2097
NSN 6220-01-364-7808
NSN 5965-01-377-3587
NSN 5960-01-247-4560
NSN 6150-01-382-8823
NSN 5990-00-116-1919
NSN 5915-01-258-6880
NSN 6220-01-058-9107
NSN 5930-00-850-7284
NSN 5905-00-869-2020
NSN 7035-01-336-0464
NSN 5835-00-148-9719