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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.
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.
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.
With lug bolts, on the other hand, the whole hub usually has to be replaced in case of stripped threads in the hub. One motivation for using lug bolts instead of wheel studs and nuts the number of parts that needs to be attached to the wheel hub. Wheel studs and lug nuts consist of two parts, while the lug bolt is a single part.
Torque charts are available to specify the required torque for a given fastener based on its property class (fineness of manufacture and fit) and grade (tensile strength). Spring Analogy for a Bolted Joint. When a fastener is tightened, a tension preload is develops in the bolt, while an equal compressive preload forms in the clamped parts.
A click torque wrench. A torque wrench is a tool used to apply a specific torque to a fastener such as a nut, bolt, or lag screw.It is usually in the form of a socket wrench with an indicating scale, or an internal mechanism which will indicate (as by 'clicking', a specific movement of the tool handle in relation to the tool head) when a specified (adjustable) torque value has been reached ...