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 5996-01-103-9092
NSN 6150-01-384-9457
NSN 5925-00-205-2767
NSN 5855-00-944-0949
NSN 6320-00-110-8005
NSN 6240-00-939-2641
NSN 5925-01-072-9189
NSN 6145-01-435-6528
NSN 5999-01-208-9930
NSN 5975-01-350-2618
NSN 5945-01-192-1460
NSN 5965-01-306-1328