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 5855-01-087-1417
NSN 6240-01-519-2935
NSN 5965-00-644-0334
NSN 6150-01-449-2346
NSN 6645-01-076-4655
NSN 6320-00-583-3105
NSN 5835-01-264-8782
NSN 5998-01-437-8445
NSN 5930-00-108-4235
NSN 2925-01-205-4584
NSN 6620-00-486-6443
NSN 6130-01-223-6139