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 6650-00-434-0188
NSN 6150-00-814-5905
NSN 6105-01-147-7293
NSN 6620-00-925-8435
NSN 5950-00-033-8486
NSN 5975-00-578-9759
NSN 5945-01-633-7496
NSN 6240-00-195-6308
NSN 5855-01-341-7320
NSN 6135-01-362-4256
NSN 5998-00-583-1616
NSN 4140-00-818-2891