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 5930-00-192-4025
NSN 5895-01-413-5038
NSN 5945-01-445-9498
NSN 6685-01-171-6979
NSN 5965-01-371-1297
NSN 6145-01-415-3978
NSN 5985-01-031-2170
NSN 6620-01-068-4498
NSN 5855-00-107-7993
NSN 5910-01-595-9038
NSN 6150-01-502-9204
NSN 5905-00-462-6027