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 5990-01-097-4721
NSN 6685-01-594-4929
NSN 5920-01-474-0820
NSN 6135-00-134-6648
NSN 5998-00-771-9059
NSN 6685-00-160-6390
NSN 5930-01-350-3974
NSN 5920-01-449-7932
NSN 5950-01-308-1697
NSN 5975-01-539-7907
NSN 5910-01-147-9483
NSN 5920-00-681-5454