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Torque wrench extension (adapter) calculator

Wrench setting when using a crow's foot or extension.

Nm
mm
mm

Calculating…

How it's calculated

Wrench setting = T × L ÷ (L + E)

An in-line extension increases the lever arm, so the fastener receives more torque than the wrench shows. If the adapter is fitted at 90° to the wrench, the effective length does not change and no correction is needed.