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 5920-00-936-1661
NSN 5990-01-310-0884
NSN 6685-01-464-3766
NSN 5975-00-957-3228
NSN 6610-00-469-3459
NSN 4140-01-388-2007
NSN 5915-00-061-6675
NSN 5930-01-127-7846
NSN 5935-01-599-8919
NSN 6145-01-137-7321
NSN 4140-00-840-2082
NSN 5998-00-244-3576