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 6150-01-466-5085
NSN 6130-01-399-6883
NSN 5996-00-113-2243
NSN 5996-01-099-4588
NSN 6645-01-607-4078
NSN 6650-01-526-1241
NSN 5960-00-715-2009
NSN 5998-00-017-4694
NSN 6240-01-080-7307
NSN 5990-00-170-4239
NSN 6320-01-476-7702
NSN 5925-01-620-3271