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 5950-01-564-4883
NSN 5835-01-149-6855
NSN 5905-01-468-0555
NSN 5935-00-125-2449
NSN 6150-01-439-9726
NSN 5925-00-155-2587
NSN 6685-01-077-3414
NSN 5925-01-445-8191
NSN 6135-00-334-4500
NSN 5835-01-487-3042
NSN 5985-00-062-0568
NSN 4140-00-191-1236