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 5998-01-022-2232
NSN 5960-01-158-9166
NSN 5985-01-503-7248
NSN 5895-00-536-0838
NSN 5935-01-361-8008
NSN 5985-01-467-0557
NSN 6620-01-611-7907
NSN 7035-01-617-0072
NSN 5895-00-137-2809
NSN 6145-01-413-2079
NSN 4140-01-623-3225
NSN 5999-01-617-1554