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 6135-01-394-4160
NSN 4140-01-425-7278
NSN 6135-01-142-6456
NSN 6150-00-526-3720
NSN 4140-01-470-8518
NSN 5930-01-613-9192
NSN 5996-01-600-1131
NSN 4140-00-097-0167
NSN 5905-01-323-4521
NSN 5950-01-418-2712
NSN 6320-01-209-0952
NSN 5965-01-186-2051