Torque wrench

How to Use a Torque Wrench Effectively

A handheld torque wrench is an essential tool in the automotive industry, widely used for tightening bolts, nuts, and fasteners during assembly processes. Also known as a torque wrench, torque spanner, or torque tool, this device allows users to adjust tightening force without affecting the lifespan of components.

With a durable structure made from high-strength materials, it can withstand heavy tightening pressure, making it an ideal choice for professionals who frequently work with bolts. In the article below, EMIN will provide a detailed overview of torque wrenches and their effective use.

Definition of a Torque Wrench

A torque wrench is a tool designed to apply a specific torque value to a fastening component such as a nut, screw, or bolt.

It enables operators to set the required torque according to technical specifications, ensuring that each fastener is tightened properly for a particular application.

Advantages of Torque Wrenches in Automotive Applications

Convenience and Ease of Use: Using a torque wrench is a simple process suitable for anyone who needs to tighten bolts or nuts. Users can secure fasteners without applying excessive physical force. This tool significantly reduces the risk of injury during assembly and repair work.

Improved Accuracy: A torque wrench ensures that bolts and nuts are tightened to the correct level, minimizing the risk of mechanical failure, cracks, or structural damage caused by improper fastening.

Optimized Performance: Torque wrenches provide superior performance compared to ratchets and traditional wrenches, as they do not rely heavily on the user’s physical strength.

With just a few simple operations, torque wrenches ensure proper tightening of bolts, nuts, and joints, creating a solid and reliable structure for automotive components.

Therefore, they have become an indispensable tool in automotive assembly lines, where precision, efficiency, and speed are critical.

Proper Control of Tightening Force

Over-tightening nuts, bolts, and joints can create excessive friction and cause serious damage to components.

Using a torque wrench allows users to apply the correct amount of force, extending the lifespan of parts and preventing mechanical failure.

This makes the assembly process more efficient and ensures that automotive components remain durable and reliable over long-term use.

Types of Torque Wrenches

Highly valued for their stable performance under high-intensity conditions, torque wrenches have become increasingly popular in the automotive manufacturing industry.

Currently, there are four main types of torque wrenches:

2.1. Electronic Torque Wrench

An electronic torque wrench operates using a built-in DC power source. After each tightening operation, the torque value is displayed on the screen for the user.

Advantages:

High accuracy

Easy to operate

Limitations:

Usually suitable only for lower torque ranges

Not ideal for high-frequency industrial use

Moderate durability compared to other types

2.2. Mechanical Torque Wrench

A mechanical torque wrench works by rotating the adjustment mechanism on the body until a “click” sound indicates completion.

There are two main types:

- Mechanical Torque Wrench with Dial

- This type includes a scale indicator. When the correct torque is reached, the dial stops at the appropriate value.

- It is suitable for both tightening and loosening operations.

Direct-Adjust Mechanical Torque Wrench

This design includes an adjustable spring lever controlled by turning the handle.

When the correct torque is achieved, the wrench produces a clicking sound and signals the user.

It can be used for both tightening and loosening fasteners.

Hydraulic Torque Wrench

A hydraulic torque wrench is designed to achieve the required torque level through hydraulic power, making it suitable for heavy-duty applications.

Automatic Torque Wrench

Automatic torque wrenches are commonly used in large-scale repair and manufacturing industries, including automotive, aerospace, and defense sectors.

How to Use a Torque Wrench

Mechanical Torque Wrench

Step 1: Unlock the wrench

Activate the unlock function by gently twisting the bottom handle or pulling it down slightly.

Step 2: Set the desired torque value

Identify the required torque level, then rotate the handle until reaching the preset position.

Step 3: Lock the setting

Switch back to the lock position to secure the torque value.

Step 4: Attach the socket and begin tightening

Regardless of the type of torque wrench used, users should pay attention to the following guidelines:

Conclusion

Above are EMIN’s recommendations on how to use a torque wrench effectively. If you have any questions or need further support, please contact EMIN directly through our website or fanpage EMIN VietNam for the earliest consultation.