Kupo Super Knuckle with Nato Clamp and 1/4"-20 ARRI Locating Pin

Kupo Super Knuckle Nato Clamp

The Kupo Super Knuckle combines a Nato Clamp with a detachable 1/4"-20 ARRI locating pin in a single double socket arm. Built from aluminum die-casting and rubber, it weighs 8.8 oz (250 g) and supports up to 17.6 lbs (8 kg). The ball joint at each end allows precise positioning of monitors, lights or cages on professional video and cinema rigs.

Replacing loose mounts and fixed arms

This knuckle replaces ad-hoc clamps or rigid arms that lack a Nato rail interface or an ARRI locating pin. The jump is worth it when you need a secure Nato connection on one side and a standard 1/4"-20 ARRI point on the other, with the ability to lock both ball joints independently for repeatable positioning under load.

For filmmakers using Nato rails and ARRI cages

It suits camera operators and rig builders who already work with Nato rails and ARRI-compatible 1/4"-20 accessories and need a lightweight, high-capacity link between them. Buyers who require a different mounting standard, a single fixed socket, or a heavier-duty arm rated beyond 17.6 lbs should look at other solutions.