The axle holds the majority of weight of a car and is a critical component of the vehicle. A car axle is the steel rod that connects the front and rear wheels to the car. All cars have both front and rear axles, which are responsible for turning the wheels when the driver accelerates the automobile. Axles are typically different for each car and drivetrain application. A car axle is designed for front-wheel-drive, rear-wheel-drive, or four-wheel-drive vehicles. Each type of axle has a specific size and weight load capacity.
Materials
Axles are typically made from SAE grade 41xx steel or SAE grade 10xx steel. SAE grade 41xx steel is commonly known as "chrome-molybdenum steel" (or "chrome-moly") while SAE grade 10xx steel is known as "carbon steel"