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 6105-01-065-3545
NSN 6110-00-112-1476
NSN 5910-01-610-3990
NSN 6150-01-559-4873
NSN 6135-01-062-9356
NSN 5996-01-350-8453
NSN 6130-01-597-2169
NSN 5925-00-286-8502
NSN 5895-00-809-0055
NSN 5990-01-632-0969
NSN 6135-01-278-9717
NSN 5920-01-499-9313