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 5930-01-542-9182
NSN 6150-01-412-2327
NSN 7035-00-968-4848
NSN 5910-01-498-5075
NSN 6645-01-274-0731
NSN 5998-01-234-1942
NSN 5975-01-487-0396
NSN 5985-01-551-1218
NSN 6130-01-579-2735
NSN 5895-00-403-7863
NSN 6240-01-205-4784
NSN 6145-01-443-3721