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 5996-00-222-6049
NSN 5965-01-411-9933
NSN 6240-01-175-3877
NSN 5915-01-017-4230
NSN 5950-00-997-0505
NSN 5920-01-389-2077
NSN 5915-00-102-6155
NSN 6320-01-103-6218
NSN 6105-01-023-7887
NSN 6685-01-585-1123
NSN 6240-01-633-9357
NSN 2925-00-155-2100