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 5975-01-649-1452
NSN 6150-01-062-0853
NSN 5945-01-373-1554
NSN 5985-00-830-0887
NSN 5996-01-315-9247
NSN 5965-01-449-2794
NSN 5915-01-633-9845
NSN 5910-01-656-5929
NSN 5935-01-649-1601
NSN 5960-01-599-9821
NSN 6620-01-290-8209
NSN 6105-01-145-5046