Torque Correction for Extended Wrench Heads
T_set (Torque Setting) ：
The torque value set on the torque wrench.T_req (Required Torque) ：
The actual torque that should be applied to the fastener.L (Effective Length of Torque Wrench) ：
The distance between the Center of Handle (Calibration Point) and the Center of Square Drive Tang.C (Extension Length) ：
The distance between the Center of Fastener and the Center of Square Drive Tang.- Conversion Formula：
T_set = T_req × (L ÷ (L + C))
Torque Conversion Formula
Required wrench setting (T_set)：--
※Example: WM-I series：L = 18cm，C = +0.5cm For a required torque of 10 Nm
→ Set wrench to ：9.73 Nm
Additional Configurations
When limited by space or using alternate adapters, treat total length as a one-dimensional vector for adjustment.
The following examples use WM-I series (L = 18 cm, T_req = 10 Nm).
Recommended Practices
- ◆Best practice: Keep the adapter at 90° to the wrench – no correction needed.
◆If angled or limited by space: Apply the formula to adjust the setting.
◆During use: Apply force slowly and steadily from the calibration point only.
◆If C/L exceeds 10%: Verify accuracy using a torque calibration device.