A lug nut is one of the fasteners that attach a car wheel to its hub. A car wheel has four, five, or six lug nuts depending on its make and model.
The appropriate torque for lug bolts varies depending on the vehicle and can range from 50 foot-pounds to 350 foot-pounds. The correct torque specifications for a vehicle can be found in the owner's manual, at a vehicle's dealership or in a repair manual for that specific model and year.
A listing of bolt torque specifications is available at EngineersHandBook.com. This website contains bolt torque specifications for materials such as steel, aluminum, brass and bronze in both standard and metric measurements.
Users can find torque specs for certain wheels at the Dorman Products wheel nut torque specifications document or at the Discount Tire wheel torque chart webpage. The two mentioned documents are not exhaustive, however. Torque specs for wheels of newer car models may not be available.
To find out a wheel torque spec, check the vehicle's manual, industry reference guide or the shop repair manual. Vehicle dealers can also provide an appropriate wheel torque spec.
The effect of the wheel lug torque depends on how much the applied torque deviates from the recommended car torque. While overtightened lug nuts cause vehicle vibration during braking, overstretches and weakens the wheel studs, undertightening causes wheel wobbling and unbalance during driving. Corr
Most frequently, use a lug wrench or tire iron to remove lug nuts. Alternatively, use a spider wrench, which is a cross-shaped tool with varying sized sockets on each tip.
Portland Bolt & Manufacturing Company, Bolt Depot, Imperial Supplies, Engineers Handbook and Federal Screw Products provide torque charts as of 2016. CNCexpo.com, Allied Systems Company, XRF Reduced Friction Chassis Parts, Engineers Edge and Repair Engineering also provide torque charts.
The torque specifications for automobile engine cylinder head bolts are located on the Federal-Mogul Motorparts website. The search feature is available on the Specifications Lookup page under the Technical Info heading of the main page. It offers cylinder head or hub-and-wheel bearing torque parame
A wheel lug nut torque chart indicates the proper amount of torque, or twisting force, to apply to the lugs nuts found on vehicle wheels. Mechanics need to apply proper torque when tightening lug nuts to ensure damage does not occur to the wheels.