Have you ever encountered problems with damaged parts due to over-tightening bolts or nuts? Using a standard Torque Wrench or pound wrench is the solution to this problem. SCMA Company is an expert in automation systems and provides high-precision measuring and testing tools. This article will take you through what a Torque Wrench is, the different types of torque wrenches, and a guide on how to use them correctly.
What is a Torque Wrench?
A Torque Wrench, or as Thai mechanics commonly call it, a pound wrench, is a tool designed to precisely control torque values when tightening bolts and nuts. A torque wrench helps prevent damage to parts in industrial systems. This precision work must be verified with Torque Tester to maintain production standards directly.
How Torque Wrench Works
Torque wrenches are used to control the torque applied when tightening nuts according to specified parameters. The mechanism for displaying values or alerting when the target torque is reached depends on the type of wrench.
Click-type (Click-type / Mechanical)
After setting the desired torque, the spring inside the handle is compressed. When force is applied to tighten the wrench until the set point, the mechanism unlocks, producing a clicking sound. The torque wrench handle will slightly fold down to alert the user to stop applying force immediately.
Digital (Digital / Electronic)
This system uses a stress sensor to capture torque values and convert them into digital data. This type of torque wrench displays the result on a screen with lights or sound alerts when the set value is reached. Users can connect the data to a computer for in-depth analysis.
Slipping-type (Slipping-type / Cam-over)
When the user tightens the torque wrench to the set torque value, the wrench head will immediately disengage or release. This mechanism perfectly prevents over-tightening problems, making it suitable for assembling delicate components.
How many types of Torque Wrench are there?
Pound wrenches are used to tighten with a specified torque or display torque values while tightening. They can be divided into 4 main types according to their working structure.
Click (Click/Micrometer Torque Wrench)
This type of tool is most commonly used on actual work sites. Users can set the torque at the handle. When the torque wrench reaches the set value, there will be an audible warning along with a slight release of the handle to prevent over-tightening.
Digital (Digital Torque Wrench)
This model has the highest accuracy, displaying digital numbers on the screen. This type of torque wrench can record data and set warning limits for detailed quality process inspection.
Dial (Dial Torque Wrench)
Users can read real-time torque values through the dial while tightening. This type of pound wrench is suitable for tasks requiring continuous monitoring of torque changes.
Beam (Beam Torque Wrench)
The structure is a steel beam with a torque scale. When force is applied, the wrench beam bends and the pointer indicates the torque on the scale. The mechanism has a simple structure.
Maintenance of Torque Wrench
Proper care of the torque wrench helps maintain accuracy and extends its lifespan. Maintenance of the torque wrench involves steps that operators should strictly follow.
Release the spring before storage
Click-type wrenches that use springs should be adjusted down to the lowest torque value indicated on the scale before storage. Follow the manual of the model, as each mechanism has different storage requirements.
Cleaning
After use, a clean dry cloth should be used to wipe oil residue from the tool. Users should not wash the torque wrench with water or use corrosive chemicals for cleaning, as this may damage the external rust protection mechanism.
Lubricate the ratchet head
Technicians should regularly apply lubricating oil to the ratchet head when friction is noticed. Maintaining this part helps the torque wrench mechanism operate smoothly, reducing wear from friction.
Avoid misuse
Use the click wrench in the direction specified by the manufacturer. Some models support both clockwise and counterclockwise directions. Avoid loosening nuts or attaching handles if the manufacturer does not specify supported methods.
Torque Wrench Usage
From the real-world experience of SCMA's engineering team, we found that torque wrenches are used in tasks requiring high precision to prevent component damage. The use of torque wrenches covers everything from assembling parts to engineering quality inspection processes.
Industrial and Automotive Work
Technicians use torque wrenches to tighten engine components as well as main structures to meet safety standards. Torque control helps prevent serious accidents caused by insufficiently tightened parts.
Inspection Work
Inspectors use torque wrenches to check torque according to the methods specified in the production process. Torque alone does not directly confirm the tension in the screw thread, because friction at the thread and contact surfaces affects the tension generated.
Mechanical Work
Mechanical components require a high degree of precision in assembly. Engineers use torque wrenches to control tightening to prevent structural distortion, helping reduce the risk of parts falling off while the machine is working hard.
Should Torque Wrenches Be Tested for Standard Values?
The accuracy of torque wrenches decreases over time of use as well as due to internal mechanism wear. Regular calibration of torque wrenches is therefore necessary to maintain industrial production process standards.
How Is Standard Value Measured on Torque Wrenches?
The calibration laboratory compares the tool's value with a reference standard. Consider the calibration results and uncertainty according to the model's coordinates, the referenced standard, and the work criteria.
Frequency of Tool Testing
Calibration cycles are determined according to the manufacturer's manual, frequency and usage conditions, as well as the importance of the task. If the wrench has been dropped or used beyond its specifications, it should be checked for accuracy before being used again.
How to Choose a Torque Wrench
Investing in the right torque wrench helps reduce on-site problems and improves production efficiency. Operators should consider the following factors before deciding to purchase a torque wrench according to international component standards such as RS Components
- Select Torque Range: Choose a model that covers the torque values required for the job, ensuring that the actual working value is between 30% - 80% of the maximum value for accurate torque wrench performance
- Drive Size: Select the drive size of the torque wrench to match the socket available, such as 1/4 inch for small jobs, 3/8 inch for motorcycles, and 1/2 inch for general automotive work
- Type of Torque Wrench: Choose a model suitable for the type of work, such as click-type for general use, and digital type for jobs requiring detailed torque data recording
- Material and Certification Standards: Check that the tool is made from high-quality steel and has a calibration certificate from the manufacturer to confirm accuracy
Summary
A torque wrench is an important tool that helps control the quality of assembly in industrial factories. Choosing a standard-compliant torque wrench along with proper maintenance will help extend its lifespan. The engineering team SCMA is happy to provide advice and offer quality torque wrenches for your business
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Choosing the right torque wrench is the starting point for sustainable production performance improvement. SCMA Company is a distributor of measuring instruments and global industrial technology equipment. If you are looking for high-quality torque wrenches along with after-sales service packages, contact our engineering team to receive the best solution immediately
Frequently Asked Questions
What is a Torque Wrench?
A tool used to set the torque when tightening bolts and nuts, preventing damage to components from over-tightening
How does a Click-Type Pound Wrench work?
When the user applies force to tighten up to the set value, the internal mechanism activates, producing a clicking sound to immediately alert the user to stop tightening
Why should you loosen the torque wrench before storing it?
Click-type wrenches that use springs in multiple models need to be adjusted to the lowest value on the scale to reduce the spring's residual pressure. Follow the storage method specified in the manual for that model
How often should a torque wrench be calibrated?
Determine the frequency based on the manufacturer's manual, usage frequency, and quality requirements of the work. Jobs requiring strict torque control may require inspection between calibration cycles
Can a torque wrench be used to loosen nuts?
It should never be used to loosen nuts as it will damage the internal mechanism, except for models specifically designed for bidirectional operation
