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 5895-01-380-3349
NSN 5998-00-733-7717
NSN 6650-01-117-5347
NSN 5999-00-812-9253
NSN 5925-00-242-2583
NSN 5920-01-499-0026
NSN 2925-00-450-7783
NSN 6645-01-544-3581
NSN 7035-00-392-5417
NSN 6610-01-296-4462
NSN 5998-00-592-0307
NSN 6110-01-158-0059