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 5920-00-913-3728
NSN 5965-01-071-3704
NSN 5930-01-634-0659
NSN 6610-01-387-3648
NSN 5996-00-473-9539
NSN 5895-00-102-4208
NSN 6145-01-487-0792
NSN 5935-00-891-1474
NSN 5965-01-060-2558
NSN 5855-01-623-8582
NSN 5998-01-348-6617
NSN 5990-00-119-5699