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 5910-01-548-8432
NSN 5905-01-146-4352
NSN 6240-01-170-3491
NSN 5930-00-887-6398
NSN 5950-00-239-5261
NSN 5910-01-408-8721
NSN 6150-01-351-3351
NSN 5960-00-241-2911
NSN 5855-00-237-4088
NSN 6650-00-486-7924
NSN 5835-01-363-4527
NSN 5920-01-093-8458