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 5930-00-884-8557
NSN 6610-01-062-3914
NSN 6620-01-633-8443
NSN 5999-01-411-3533
NSN 5996-00-813-9763
NSN 6685-01-166-9508
NSN 6685-01-087-3643
NSN 5895-01-348-3950
NSN 2925-01-524-6622
NSN 6650-01-290-4001
NSN 5855-00-189-6066
NSN 5910-01-160-7848