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 5999-00-800-0944
NSN 5998-00-529-2551
NSN 5998-01-048-9575
NSN 5998-00-832-9397
NSN 6240-00-839-7440
NSN 5975-01-302-8780
NSN 5960-01-423-1085
NSN 5985-01-479-5078
NSN 5895-00-278-8092
NSN 6105-01-433-2204
NSN 5915-01-142-2018
NSN 6685-00-467-2943