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 6610-01-542-2276
NSN 6650-00-393-0447
NSN 6105-01-297-9977
NSN 7035-00-616-4410
NSN 6320-01-201-2776
NSN 6150-01-450-5394
NSN 5895-01-578-0909
NSN 6240-01-131-9580
NSN 5975-01-125-9474
NSN 5990-01-615-7823
NSN 6135-01-491-9360
NSN 5910-00-204-8497