Kupo KS-425 Super Knuckle Ball With 1/4"""" Screw

Kupo KS-425 Super Knuckle Ball — CNC Aluminum with 1/4in-20 Screw for Cage Mounting

The Kupo KS-425 Super Knuckle Ball provides a compact, CNC-machined aluminum ball joint that uses a 1/4in-20 screw for compatibility with other super knuckle accessories and common camera hardware. You can mount it directly to a camera cage using standard 1/4in-20 threaded holes. It also includes a thumb screw for quick locking and a rubber pad to protect surfaces from scratches.

Key features

• Compatible with other super knuckle ball accessories — the 1/4in-20 screw lets you pair it with existing gear that uses the same standard thread.
• Easy cage mounting via 1/4in-20 threaded holes — install the knuckle ball on camera cages that provide these common mounting points.
• Thumb screw for quick locking — secure the ball joint fast for convenient and firm installation during shoots.
• Rubber pad protection on the base — the anti-slip pad prevents accidental scratches on your equipment and improves grip.
• CNC-machined aluminum construction — the ball is made from aluminum using CNC machining for consistent fit and finish.

How to use and where it fits

Use the KS-425 to add an adjustable connection point between accessories and your camera cage. For example, attach it to a cage plate or a small accessory that features 1/4in-20 threaded holes. Then tighten the thumb screw to lock the joint quickly when you reach the desired angle.

Additionally, if the thumb screw requires extra torque or loosens over time, you can re-tighten the unit using a #3 Allen key via the provided hole. This feature helps maintain a firm, reliable installation during extended use.

Protection and maintenance

The knuckle ball includes an anti-slip rubber pad at the bottom to prevent scratches and reduce rotation against the mounting surface. Meanwhile, the Allen key access lets you perform a simple maintenance re-tighten if the thumb screw becomes less secure over time. These two features together help protect both the knuckle and the equipment it attaches to.

FAQ

Question: Will this knuckle ball work with my existing super knuckle accessories?
Answer: Yes. The KS-425 uses a 1/4in-20 screw that is compatible with other super knuckle ball accessories and standard 1/4in-20 threaded fittings.

Question: How do I mount it to a camera cage?
Answer: Mount the knuckle ball by threading its 1/4in-20 screw into a 1/4in-20 threaded hole on your cage. Then use the thumb screw to lock the joint in place for a secure installation.

Question: What can I do if the thumb screw loosens over time?
Answer: The unit includes a hole for a #3 Allen key so you can re-tighten the mechanism if the thumb screw becomes less secure. This lets you maintain firm locking without replacing parts.

Question: Will the knuckle ball scratch my gear?
Answer: The base has an anti-slip rubber pad designed to prevent accidental scratches and to add grip between the knuckle ball and the mounting surface.