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 6320-01-116-3980
NSN 6645-00-097-9269
NSN 5915-01-249-3113
NSN 6620-01-044-3371
NSN 5985-00-759-8893
NSN 5945-00-470-5080
NSN 5855-00-256-5562
NSN 6135-01-100-3593
NSN 5998-01-471-1760
NSN 6240-01-045-9269
NSN 5975-01-534-9261
NSN 5855-01-321-3881