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 5835-00-327-6192
NSN 5985-00-631-4011
NSN 5905-01-491-8791
NSN 5935-01-609-4653
NSN 6145-01-076-3699
NSN 6610-01-544-6551
NSN 6320-00-546-9249
NSN 6620-01-601-7491
NSN 5950-00-832-5474
NSN 5895-01-476-7247
NSN 6620-00-635-7347
NSN 6645-00-150-6526