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 4140-00-197-9712
NSN 5905-01-108-1793
NSN 5910-01-514-7309
NSN 6135-01-039-2882
NSN 5895-01-377-0554
NSN 2925-01-534-7314
NSN 5895-01-096-7478
NSN 6620-01-105-5770
NSN 5965-01-163-8958
NSN 6110-01-501-5764
NSN 6110-01-364-2145
NSN 5950-01-254-2699