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 5945-01-156-0242
NSN 5835-00-106-2120
NSN 5930-01-629-5278
NSN 5895-01-302-3976
NSN 5999-01-416-2484
NSN 6240-01-466-6285
NSN 7035-01-581-8397
NSN 5920-01-607-4346
NSN 6620-01-379-3300
NSN 6685-01-433-1538
NSN 5915-01-118-5012
NSN 5905-00-155-4767