Torque wrenches come in different sizes, so make sure you pick one that meets your vehicle’s specifications.
Use for final adjustments only.
A torque wrench is a precision tool, so should not be used for the full fastening job. Doing so can cause undue wear and tear on the tool. Instead, use a fastening tool, such as an impact wrench, ratchet, or any other fastening device, until the bolt is snug and then use a torque wrench for the final adjustment.
Set the torque value.
Unlock the handle and rotate it until you’ve reached your desired torque on the main scale (located on the shaft). Check your owner’s manual to find the precise value.
Insert a socket.
Choose a socket that fits the fastener you want to tighten and insert it onto the square drive of the ratchet. Then attach it to the fastener.
Using only your hands, apply slow, steady pressure to the handle. Do not put pressure on any other part of the wrench.
Do not over-torque.
When the wrench momentarily releases, either with or without a click noise, release the pressure immediately.
Dial it back to zero.
After using your torque wrench, always dial it back to zero. Leaving it set means the spring mechanism inside it remains loaded, taxing and wearing out the spring unnecessarily.
Take care of it.
The mechanism inside a torque wrench is specifically calibrated to offer precision while fastening. Damage to the tool can affect performance, so handle it carefully.
Don’t use it as a breaker bar.
Keep in mind that a torque wrench is only made for fastening. Don’t use it as a breaker bar to unfasten bolts, as you could damage the mechanism.