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 5990-00-898-2675
NSN 6320-01-425-1417
NSN 5998-01-273-0124
NSN 6610-01-392-0231
NSN 5905-01-441-3809
NSN 5998-01-242-9761
NSN 6240-01-261-4958
NSN 5855-00-089-3974
NSN 5920-01-483-6830
NSN 6110-00-848-8236
NSN 5945-00-945-1590
NSN 5960-01-504-1892