This SAE Recommended Practice establishes dimensions and tolerances for the interface between inboard mounted disc brake rotors and disc wheel hubs. The geometric features described in this document are shown at true position. This document is intended for inboard mounted disc brake rotors and disc wheel hubs for Class 5, 6, 7, and 8 commercial vehicles. Special and less common applications are not covered.
This document was developed to help the commercial vehicle market standardize the hub and rotor interface dimensions for class 5, 6, 7, and 8 vehicles equipped with disc brakes.