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 6320-00-643-0958
NSN 6240-00-892-6175
NSN 5985-01-583-1576
NSN 5920-01-599-8622
NSN 6620-01-048-4145
NSN 5935-00-932-3167
NSN 5925-01-564-2154
NSN 5999-00-827-2027
NSN 5915-01-123-8292
NSN 5998-01-023-8080
NSN 5965-00-661-0469
NSN 5910-00-407-7620