Cross drilling is a machining process used to help automotive brake rotors dissipate heat better. A series of small diameter holes are bored through the rotor to provide more surface area to radiate heat. The holes are either cut perpendicular to the rotor surface or at a 45 degree angle.

This process actually weakens the structural integrity of the rotor so it is generally seen in high performance/racing applications only where expensive alloy rotors are required.

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