What Size Are Car Wheel Bolts?
2 Answers
Different vehicle models have different sizes, but the common specifications are 17mm, 19mm, 21mm, and 22mm. Below is relevant information about wheel bolts: 1. Introduction: Wheel bolts refer to the screws installed on the hub that connect the wheel, brake disc (or drum), and the hub. Their function is to securely fasten the wheel, brake disc (or drum), and hub together. The weight of the car is ultimately borne by the wheels, and the connection between the wheels and the car body is achieved through these bolts. Therefore, these wheel bolts effectively bear the entire weight of the car and also transmit the torque output from the transmission to the wheels. During operation, they are subjected to both tensile and shear forces. 2. Structural Composition: The structure of wheel bolts is very simple, consisting of a screw, nut, and washer. Based on the structure of the screw, they can be further divided into single-end bolts and double-end bolts. Most modern cars use single-end bolts, while double-end bolts are typically used in medium and small-sized trucks.
When changing tires for my car, I discovered that the size of lug nuts actually varies by vehicle. The most common sizes are 17mm and 19mm, with sedans often using 17mm, while SUVs or trucks might require 19mm or even 21mm. The size refers to the wrench socket width of the nut, not the length of the bolt. I recommend first checking your owner's manual, which should clearly specify the correct size for your model. If unavailable, measure your old nuts with a ruler or visit a repair shop to test-fit their tools. Using the wrong size can lead to stripped threads or loose wheels, which is especially dangerous at high speeds. It's handy to keep a standard wrench set in your trunk for emergencies. Also, remember to regularly check if the nuts are loose—this helps extend tire life.
