two piece clamp locknuts for extreme vibration

These two-piece nuts are easier to install but can endure high vibrations, just like steel-insert locknuts. They are ideal for threaded rods and exceptionally long screws since the two parts spin freely by hand until you tighten them together with a wrench. Their grasp will weaken with repeated use, but you can reuse them a few times. Drake-style locknuts are another name for them.

Once assembled, height includes both nuts.