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 5905-01-283-1156
NSN 5910-01-139-6090
NSN 5998-01-249-9358
NSN 6650-00-680-9595
NSN 5950-01-431-3336
NSN 5945-01-249-6084
NSN 6220-01-329-2582
NSN 6105-00-871-3551
NSN 5915-01-527-7812
NSN 6240-01-549-1743
NSN 5945-01-267-3960
NSN 6650-01-026-6572