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  • Calculations for Torque Wrench Extension Adapters and Spanners

When using extension adapters and spanners, the torque applied to the fastener is greater than that preset torque setting or the torque value displayed on the tool. To calculate the true torque for the fastening application, use this formula. To ensure that the proper torque is applied when using extension spanners, keep the extension “in-line” with the axis of the wrench as shown below: