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 6320-01-173-7950
NSN 5915-01-630-3083
NSN 5895-01-049-8008
NSN 5920-01-631-4898
NSN 5915-01-414-2782
NSN 6620-00-899-6403
NSN 6150-01-333-4441
NSN 5920-01-487-5516
NSN 7035-01-487-4038
NSN 6110-01-027-0091
NSN 5950-01-100-0079
NSN 5999-01-148-1103