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 6105-01-361-5417
NSN 6220-01-184-0228
NSN 5990-01-225-9820
NSN 5925-00-101-1481
NSN 6685-01-586-8392
NSN 5905-01-472-5297
NSN 6105-00-161-1834
NSN 5950-00-939-6387
NSN 6320-00-937-5625
NSN 5996-01-398-2147
NSN 6610-00-315-9315
NSN 6145-01-609-3249