A Guide to Choosing and Installing a Torque Wrench Reaction Arm

The right tool boosts efficiency, improves accuracy, and keeps you safe on the job—using the wrong one leads to mistakes and increases risk. The same applies to the components that support your tools, like the reaction arms used with torque wrenches.

In this blog post, we’ll determine how to choose and install a torque wrench reaction arm with the help of our partners at RAD Torque Systems.

What Is a Torque Wrench Reaction Arm?

Reaction arms attach to a torque wrench and absorb and transfer reaction force produced during fastening without affecting freedom of movement, helping to prevent operator fatigue.

Here’s how it works: The socket turns the nut onto a thread until it tightens and stops moving. This tightening creates torque, the rotational force applied to the nut. The barrel of the wrench and the reaction arm rotate in the opposite direction until the arm stops against the reaction surface.

Unlike impact wrenches, the RAD torque wrench redirects these forces so they don’t transfer to the operator’s hand. Instead, the torque is applied between the reaction surface and the nut being turned. 

Watch this video from RAD for an illustration of this process.

How Do I Know I’ve Chosen the Right Torque Wrench Reaction Arm?

To make sure you’ve chosen the appropriate reaction arm, you’ll need to:

• Ensure the socket is even with the end of the reaction arm.
• Ensure the foot of the reaction arm aligns.
• Ensure the tool is positioned at a 90-degree angle while operating.

Choosing the right reaction arm also involves understanding your specific application. Heavy-duty jobs may require extended arms to handle greater forces, while compact arms work better in tight spaces. Materials like lightweight aluminum offer portability, while steel arms are better suited for demanding tasks requiring extra durability.

Watch this video from RAD to learn more.

How to Install an Industrial Torque Wrench Reaction Arm

Install the reaction arm by sliding it onto the barrel with the correct side out. The arm extension should always face away from the tool. Installing it backward may put the extension too close to your hands and lead to injury.

With the reaction arm firmly seated, lock it to the barrel with the supplied retaining ring. Place the desired size socket on a square drive. Then, install the socket lock pin and set the O-ring to keep it in place.

Tips for Safe and Effective Operation

Stay safe and get the job done right with these quick tips:

• Keep your hands away from the reaction arm and barrel while the tool is running to avoid injuries.
• Ensure the reaction surface is steady and strong enough to handle the applied torque.
• Regularly check your wrench and reaction arm for wear or damage to avoid accidents and keep your equipment in top shape.

Correct installation makes industrial torque wrenches more efficient and safer to operate. In bridge and heavy construction, a properly installed reaction arm ensures workers can secure large bolts and fasteners with precision, preventing under or over-tightening that could compromise structural integrity. Similarly, in pipeline maintenance, where high torque levels are required, secure installation of the reaction arm prevents tool slippage and enhances operator control, reducing the likelihood of accidents. 

Across industries, these tools are essential for maintaining precision and ensuring workplace safety in demanding applications.

Get Expert Advice on Torque Wrench Accessories Now!

If you want to know more about RAD torque wrench reaction arms, Maxpro can help. We’re the top supplier of RAD products on the eastern seaboard. We sell, repair, and calibrate RAD’s products and tools.

Contact us and we’ll help you choose the best RAD torque wrench accessories for your project needs, whether in manufacturing, construction, or any industry that depends on precise torque applications.

FAQs

How does a reaction arm improve safety?

A reaction arm redirects the torque force away from the operator, reducing the risk of injury and strain. It keeps the wrench stable, especially when using high-powered tools like an industrial torque wrench.

Are RAD torque wrenches compatible with all reaction arms?

Most RAD torque wrenches are designed to work with a range of reaction arms, but using a compatible, high-quality arm ensures maximum performance and safety.

Do I need to maintain my reaction arm?

Yes, regular inspections for wear and damage are crucial. Maxpro can help you keep your reaction arm and wrench in top condition for consistent performance.