How to Use
An essential tool that ensures your car is clamped together correctly
Learn how to work your torque wrench properly.
Torque units Using the torque wrench Tech Tip Why torque is important Tech Tip Torque is a rotational force measured in Newton metres (Nm) or pounds feet (lb ft). A 1m bar on a bolt with a 1kg mass suspended at the end would have a torque of 10Nm. A 1ft bar with 10lb at the end would have 10lb ft torque. Torque wrench designs differ. The most common type requires an internal spring to be compressed until the external scale reads the desired torque. Apply an even force until the gauge indicates the desired torque or it clicks – then stop. Stretch bolts may require tightening to a specified torque, then tightening by a number of degrees. Fasteners exert clamping force. A torque wrench indirectly measures this clamping force by measuring the twisting force as you tighten it. Your manual will state the correct torques of key fasteners around your classic. Read your manual carefully as some metric readings may be in kg/m and some imperial readings in lb in.