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 5998-01-240-7353
NSN 6130-01-197-7397
NSN 6610-01-533-0279
NSN 6150-00-175-3083
NSN 5965-00-513-1352
NSN 6220-01-506-9654
NSN 5915-01-627-5121
NSN 5996-01-337-5172
NSN 5945-01-003-9426
NSN 6620-00-893-1303
NSN 5945-01-157-7683
NSN 5855-00-832-9341