Torque Multiplier Calibration
Torque multipliers enable operators to achieve high torque with lower input effort. They are used across oil and gas, structural steelwork, power generation, and heavy industry, often in situations where fastener integrity is absolutely critical. If the multiplication ratio drifts, every bolt tightened with that tool is at risk of being under- or over-specification.
We provide calibration services for manual and powered torque multipliers, verifying both the multiplication ratio and the output accuracy against traceable standards.
How Do Torque Multipliers Work?
A torque multiplier uses a planetary gear system to increase the torque applied by the operator. You apply a known input torque using a hand torque wrench, and the multiplier amplifies it by a fixed ratio, commonly 3:1, 5:1, or even 25:1 for high-torque applications.
The output torque is the input torque multiplied by the gear ratio, minus any efficiency losses in the mechanism. For example, a 5:1 multiplier with 95% efficiency receiving 100 Nm of input would deliver 475 Nm at the output.
The accuracy of that ratio is what calibration verifies. If the gears are worn, the lubrication has degraded, or the reaction arm is not functioning correctly, the actual output can differ from the expected value.
Why Does Torque Multiplier Calibration Matter?
Torque multipliers are typically used where the target torque is too high for a standard hand wrench. These are large fasteners on critical joints. Flange bolts on pipelines, foundation bolts on wind turbines, structural connections on bridges and buildings.
If the multiplier is delivering 10% less than expected, every bolt tightened with it is under-specification. In pipeline applications, that means potential leaks. In structural applications, that means compromised joint integrity.
Calibration confirms the multiplier is performing within its stated accuracy and gives you documented evidence for your quality records and compliance requirements.
What We Test
Multiplication ratio verification. We apply known input torques and measure the actual output, comparing the measured ratio against the manufacturer’s stated value.
Output accuracy. We test at multiple points across the multiplier’s operating range, verifying that the output tracks the input consistently across the full torque spectrum.
Efficiency measurement. Gear losses reduce the effective output. We measure the actual efficiency and report it alongside the ratio, so you know exactly what output to expect for a given input.
Physical inspection. We check the gears, bearings, reaction arm, and output drive for wear, damage, and any condition that could affect performance or safety.
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Frequently Asked Question's
If you can’t find what you’re looking for, simply get in touch with our friendly team, who are here to answer any questions you might have.
Every 12 months is the standard recommendation, or more frequently if the tool is heavily used. Any drop, impact, or suspected damage should prompt immediate recalibration before the tool is used again.