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 5965-01-392-1761
NSN 5920-00-880-2433
NSN 5990-01-054-3332
NSN 5985-00-964-3547
NSN 6130-00-113-4558
NSN 5935-00-900-7677
NSN 6240-00-900-8642
NSN 6685-01-340-7998
NSN 5905-01-646-1831
NSN 6150-00-130-0552
NSN 5950-01-113-4125
NSN 2925-00-816-8765