Why and When to calibrate torque wrenches?

March 4, 2020by absadmin0

It is natural for torque wrenches to go out of calibration due to consistent usage and time. To ensure torque accuracy, tools should be calibrated regularly. Calibrating torque wrenches and pressure gauges of hydraulic power packs not only boosts the efficiency of the tool but also ensures tool safety. In this article, we will be addressing the importance of calibration and the time frame.
What does calibration do?
Calibration ensures that the torque wrenches apply the right torque output to fasten a bolt accurately. Similarly, pressure gauges of power packs require calibration to ensure it is delivering the right pressure to the torque wrenches as reflected in the gauge.

As non-calibrated tools can lead to over-tightening or loosening fasteners, they can cause the bolt to deform or break. In short, calibration ensures that tools maintain the desired performance and do not damage the applications.
Why should you calibrate?
Generally, it is assumed that torque wrenches will deliver accurate torque output if operated and value set correctly. However, people fail to realize that torque wrenches are made up of moving components that are subjected to wear with time. Since they are also exposed to extreme conditions on-site, the risk of damage also increases. A calibration error of more than +/- 5% is not acceptable for tool safety purposes.
Following are some of the reasons to calibrate
• To check if the tool is delivering accurate output.
• To conduct a quality check on the torque wrench and hydraulic power pack ensuring the components have not deteriorated.
• To assure desired levels of performance when operational.
• Testing a new product.
• Ensure plant, equipment, and employee safety.
• To comply with industry, organizational and government standards.
When to calibrate your torque tool, pressure gauge? And how often?
As different applications and jobs require different torque wrenches, every tool requires calibration at different intervals of time. This means that all tools cannot be scheduled for calibration at the same time. While some recommend calibrating tools once a year, some recommend twice. However, it all depends on the frequency of tool usage and the ISO QC protocol.
Some protocols that should be considered to understand when to calibrate are
• Follow the recommendation of the manufacturer to understand the frequency of calibration required.
• Before initiating any new projects/ large scale jobs, calibrate to ensure the tools deliver precision torque output.
• Post repairs or spares replacement
• To comply with international, government, plant certification standards.
• Schedule calibration services if tool usage frequency is high.
• For safe operation, calibrate at least once annually.

How can ABS help?
Enhance your tool reliability and optimize its performance with ABS Gulf’sin-house tool calibration lab. Our in-house calibration lab is capable to ensure we meet our customer’s requirements. Our highly-trained skilled personnel and well-equipped lab are capable of calibrating manual, hydraulic, pneumatic, or electric torque wrenches up to 20000 Nm.

We hope this article answers all your calibration questions. We are sure that the mentioned pointers will help you plan your calibrations better and enhance your tool’s life. Visit us next time for more knowledge sharing articles.


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