Sony
Sony Alpha a6400 compact mirrorless camera black with 16-50mm and 55-210mm lenses 32GB
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Kupo
Kupo Super Knuckle with Nato Clamp and 1/4"-20 ARRI Locating Pin
A lightweight aluminum double socket arm with a Nato clamp and 1/4"-20 ARRI locating pin, supporting up to 17.6 lbs
- Robust aluminium and rubber construction ensures long-lasting durability
- Integrated Nato clamp delivers secure, stable mounting on standard rails
- Detachable 1/4"-20 ARRI locating pin fits a wide range of camera cages
- Lightweight at 8.8 oz (250 g) for easy transport on mobile shoots
- Supports up to 17.6 lbs (8 kg) for heavy professional equipment
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.
Highlights
- Robust aluminium and rubber construction ensures long-lasting durability
- Integrated Nato clamp delivers secure, stable mounting on standard rails
- Detachable 1/4"-20 ARRI locating pin fits a wide range of camera cages
- Lightweight at 8.8 oz (250 g) for easy transport on mobile shoots
- Supports up to 17.6 lbs (8 kg) for heavy professional equipment
Specifications
No published specifications for this item yet.
Questions about this item
What width Nato rail does the clamp accept?
The integrated Nato Clamp fits any standard Nato rail profile used in video and cinema rigs.
How do I secure the Super Knuckle once the clamp is on the rail and the pin is in the cage?
Tighten the central locking knob on the double socket arm to lock both ball joints simultaneously; the step often missed is leaving the knob loose after positioning.
When should I replace the rubber inserts inside the ball joints?
Replace them when the arm no longer holds 17.6 lbs (8 kg) firmly or when the rubber shows cracking from repeated tightening cycles.
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