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From left: 9 lug nuts and 4 lug nut attached to screw-in wheel studs. A bolt circle with four lug nuts on an Acura. A lug nut or wheel nut is a fastener, specifically a nut, used to secure a wheel on a vehicle. Typically, lug nuts are found on automobiles, trucks (lorries), and other large vehicles using rubber tires.
Installing a wheel with a lug wrench thus requires a bit of rough guessing about proper tightness. Excessive force can strip threads or make the nuts very difficult to remove. Also, uneven torque between the various lug nuts, or excessive torque, can lead to warping of the brake rotor if the car is equipped with disc brakes.
Should a lug nut become loose, the pointer will move in line with the movement of the lug nut, i.e. the tips no longer point to each other. The wheel nut indicators allow not only a quick and efficient check of the wheels by the driver, but also by the control authorities. In addition, the inspection can be easily documented with a photo.
Where the rotation of a shaft would cause a conventional right-handed nut to loosen rather than to tighten due to applied torque or to fretting induced precession. Examples include: The left foot pedal on a bicycle [2] The left grinding wheel on a bench grinder; The axle nuts, or less commonly, lug nuts on the left side of some automobiles
A lugnut off a race car. A centerlock wheel is a type of automobile wheel in which the wheel is fastened to the axle using a single, central nut, instead of the more common ring of 4 or 5 lug nuts or bolts. It is mostly used in racing and high end sports cars.
Another variation of lug nut is the "locking wheel nut", which is used as a theft prevention method to keep thieves from stealing a vehicle's wheels. When utilizing locking wheel nuts, one standard lug nut on each wheel is replaced with a nut that requires a unique key (typically a computer-designed, rounded star shape) to fit and remove the ...