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 5910-01-016-7823
NSN 5950-01-183-2077
NSN 5985-00-689-5624
NSN 6650-00-084-4258
NSN 5930-00-906-8868
NSN 5975-00-113-4710
NSN 5920-01-048-7462
NSN 6105-01-392-1539
NSN 6645-01-258-5558
NSN 6650-00-170-5095
NSN 5960-00-167-7668
NSN 6145-01-045-3472