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 5945-00-458-8757
NSN 5925-01-199-6033
NSN 5915-01-200-8075
NSN 5935-01-311-0863
NSN 6105-01-031-3874
NSN 5996-00-150-7335
NSN 6135-00-866-2311
NSN 5945-00-540-1052
NSN 5935-00-288-5973
NSN 5950-00-005-1944
NSN 5920-01-397-2754
NSN 5905-00-143-8498