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 5990-01-318-3238
NSN 6130-00-684-6773
NSN 5855-01-236-9645
NSN 5905-01-556-4408
NSN 6650-00-670-2516
NSN 5910-01-085-6434
NSN 4140-01-384-4389
NSN 5930-00-734-6138
NSN 5925-00-905-8196
NSN 5999-01-141-0403
NSN 6110-01-355-0563
NSN 5996-01-418-5140