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Torque Wrench Calibration

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Over time, a wrench’s performance degrades due to the wear and tear of industrial use. Many pieces of equipment are subject to vibrations, repetitious movements and pollutants that can have a negative impact on the accuracy of the torque wrench; calibration readjusts it so that the performance it delivers matches the amount of torque indicated on the gauge or screen. Read More…

Torque Wrench Calibration Torque wrench calibration is the process during which a torque wrench is adjusted to ensure its accuracy and precision of a device. It is performed on new tools to show that it was manufactured with high accuracy as well as on used equipment to update it and keep the torque wrench performing at certain standards.
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Leading Manufacturers

West Conshohocken, PA  |  610-825-3310

For over 40 years, Strainsert Company has been an industry leader in manufacturing calibration services. Our goal is to provide calibrating services that are thorough and accurate, and we have experience serving a variety of applications.

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Strainsert Company $$$

Monterey, CA  |  831-373-0200

Sierra provides accurate calibration services for mass flow meters and controllers, insertion thermal flow meters, vortex, and ultrasonic flow meters. With more than 40 years of expertise in gas, air, or liquid flow calibration, you can count on our team to make sure your flow meter operates with efficiency and pinpoint accuracy. We believe in providing personalized and customized service, and doing everything we can to maintain credibility with our clients. To get started, contact Sierra today!

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Sierra Instruments $$$

North Haven, CT  |  203-484-3707

Custom Calibration Inc. specializes in on-site and laboratory calibration which will keep costly equipment downtime to a minimum and maximize your overall productivity. We have over 30 years of experience providing calibration services for mechanical, dimensional, scale, torque, humidity, and many more applications. Our company’s mission is to achieve total customer satisfaction by providing prompt, precise, tailor-made calibration solutions to fit your specific needs.

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Custom Calibration Inc. $$$

Garland, TX  |  972-278-7878

Accura Calibration is a full-service calibration lab with a very extensive list of capabilities. Our NIST Traceable calibration services are timely & accurate, and we maintain ISO 17025, ISO 9001, ANSI Z540.1 and ANSI Z540.3 certification/accreditation.

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Accura Calibration $$$

Grand Rapids, MI  |  800-348-5701

Grand Rapids Metrology is Michigan’s premier source for measurement and weighing solutions! Our dedicated service team offers an industry-leading scope of capabilities from ISO 17025 certification, to heavy capacity overhaul services, to custom solutions engineered to fit specific business needs. Let GRM’s 95 years of experience and technical expertise work for you.

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Grand Rapids Metrology $$$

Newport News, VA  |  866-487-3227

ACR performs ANSI/Z540, A2LA and ISO 17025 calibration services, which include, but are not limited to, pressure, vacuum, fiber and electrical. We also hold NAVSEA certification. We offer calibration testing services and software as well as instrument calibration. On-site or off, ACR can support your needs.

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ACR Technical Services, Inc. $$$

Cincinnati, OH  |  800-686-3730

CPI’s calibrations are performed in our environmentally controlled laboratory by our highly trained staff of technicians. If you have a high volume of calibrations, we can arrange for a permanent on-site technician to assume all responsibilities of operation or establish an on-site calibration department. We offer competitive pricing, fast professional service & detailed traceable certifications.

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Cincinnati Precision Instruments, Inc. $$$
placeholder image Strainsert Company Sierra Instruments Custom Calibration Inc. Accura Calibration Grand Rapids Metrology ACR Technical Services, Inc. Cincinnati Precision Instruments, Inc.

Calibration is a comparison between a measurement of a known magnitude and a measurement taken from the wrench that is being calibrated. The difference is observed and then the technician makes the necessary changes and adjustments before measuring again to ensure that the values are identical. The calibration process is important to many industries and companies because the accurate functioning of their torque wrenches is fundamental to their daily operations.

Since torque wrenches are widely used for the correct tightening of nuts and bolts, a torque wrench or other torque tool that incorrectly displays the force may lead to under-tightening which does not provide the proper thread loading or over-tightening which stretches the fastener beyond its limits, causing it to fail.

Torque wrench calibration may take place in a torque lab or onsite. In a torque laboratory, professional calibrators test, repair and adjust torque wrenches and other tools. They service and calibrate torque wrenches to levels of 0.5% to 1% margin of error. A trained technician performs the calibration by attaching a device that is able to produce a correct reading in contrast to the measurement of the torque wrench.

The technician who performs the calibration usually completes a summary report and certificate to show that the torque wrench has been calibrated to industrial and national standards. Another option is to adjust the tools onsite using a system of weights and distances to "teach" the torque wrench what certain measurements are. That is, when a known weight is applied, the wrench can be adjusted to display that measure which it then will use as a reference.

Many mechanics rig up their own systems using a vise and hanging weights. Because torque is the product of force and distance, a torque wrench can be calibrated using a weight that is accurately measured and a known distance. Calibrations are usually performed for the middle of the torque wrench's range and they are usually done within 4% of the exact amount.