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 5965-01-084-2385
NSN 6685-01-420-7407
NSN 5990-01-578-5382
NSN 6220-00-383-9402
NSN 4140-01-478-2409
NSN 5915-01-641-7424
NSN 6150-01-504-6781
NSN 5930-01-428-7766
NSN 6240-00-181-0730
NSN 6610-01-187-1748
NSN 5975-00-014-0784
NSN 6150-01-538-6045