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 5895-01-533-7191
NSN 5905-00-686-1522
NSN 5925-01-606-9684
NSN 6130-00-406-6778
NSN 7035-01-013-9889
NSN 6110-01-500-6543
NSN 5910-01-553-4137
NSN 5895-01-570-4713
NSN 5855-01-010-4921
NSN 6105-01-113-7039
NSN 5965-01-252-8701
NSN 5855-00-483-0020