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 6110-00-148-8536
NSN 5910-00-212-5969
NSN 5920-00-703-0207
NSN 5915-01-100-3652
NSN 5945-01-595-6273
NSN 6150-00-390-1363
NSN 6105-01-126-4519
NSN 5855-01-357-7907
NSN 6135-01-470-4077
NSN 5930-01-394-1152
NSN 6220-00-006-9746
NSN 6240-00-715-5118