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 7035-00-513-9764
NSN 6685-01-307-1150
NSN 5985-00-336-1095
NSN 5998-00-012-0920
NSN 5905-01-485-8455
NSN 6650-01-058-0049
NSN 5895-01-542-1436
NSN 6610-01-327-3187
NSN 5835-01-355-0308
NSN 6135-00-613-1068
NSN 5920-00-981-5821
NSN 5925-01-627-8005