Lug nuts are manufactured to meet the thread size of the studs on cars and are often tapered for wheel security. Torquing your car's lug nuts to the proper specification is very important for your safety and the function of your car.
Check Your Manual
Your car owner's manual may have the manufacturer's specification for torquing the lug nuts. Always go with this specification, if you have it. If not, ask a dealer that sells your car's brand or contact an auto shop for the information.
You should torque your car's lug nuts in as much of a star pattern as you can, that is, bottom right, top left, etc. This helps to secure the wheel onto the car, preventing wheel tilting.
Lug nut torquing is expressed in foot-pounds. Use torque sticks with an air gun or a torque wrench to get the correct torque. If your studs or lug nuts are sized between 12 X 1.25mm to 1.5mm or are 7/16-inch, torque the nuts to 70 to 80 foot-lbs; 14 X 1.25mm to 1.5mm, to 85 or 90; 1/2=inch 75 to 85; and 9/16-inch 135 to 145.