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 5910-01-299-3567
NSN 5950-01-390-7614
NSN 5855-01-136-9532
NSN 5935-00-725-7723
NSN 5990-01-632-0969
NSN 5930-01-577-4145
NSN 5945-00-022-9717
NSN 5999-00-491-8197
NSN 6320-01-160-8578
NSN 6145-01-329-5935
NSN 5950-00-954-1176
NSN 5965-01-448-9585