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 6650-01-423-5649
NSN 5998-01-252-0292
NSN 6650-01-364-4616
NSN 6620-01-142-7376
NSN 5990-00-988-7902
NSN 6110-01-022-8808
NSN 5915-01-509-9554
NSN 5945-01-255-8863
NSN 6320-01-096-6649
NSN 5930-01-129-5987
NSN 5950-01-514-8139
NSN 5895-00-311-8969