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 6150-00-470-2702
NSN 5975-01-237-9442
NSN 7035-01-440-8877
NSN 5835-00-269-2232
NSN 5965-01-613-8414
NSN 5945-01-343-9773
NSN 5945-01-235-8662
NSN 6130-01-527-4041
NSN 6645-00-276-7544
NSN 5895-01-112-7609
NSN 5985-01-422-4682
NSN 5960-01-649-1341