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 6610-01-051-4735
NSN 5915-00-960-4192
NSN 6110-01-554-0260
NSN 6610-01-189-3001
NSN 5985-00-983-4751
NSN 6110-00-625-8643
NSN 5960-00-284-6150
NSN 5895-01-422-0593
NSN 5905-00-620-9726
NSN 6620-00-988-0976
NSN 5960-01-632-6576
NSN 6685-01-552-2017