The values in this torque chart refer to Metric Class 8.8, Class 10.9, and Class 12.9 bolts. In practice, there are many different design factors that affect permissible torque including bolt type, thread engagement, material type, and tool accuracy. As such, all values in the chart should be considered reference values only. To ensure appropriate torque is applied to the bolts on your car (or any other project for that matter), consult your owner’s manual or service manual for correct torque specifications. Furthermore, it is important to use a correctly calibrated, high quality torque wrench to apply torque to ensure accuracy.