This standard specifies the technical requirements, test methods and marks, Encasement and transportation of the fixed speed friction testing machine. Appearance of the testing machine requires surface paints to be flat, smooth, without weld marks, rust, cracking and other defects; friction disc material is gray cast iron, the effective thickness of friction disc shall not be less than 18.0mm, abrasion depth shall not exceed 0.5mm; chilled down water inlet and outlet pipes shall be smooth without water leakage and air leakage; noise and vibration of the testing machine shall be within the normal range; Measuring location of Thermocouple shall comply with regulations, and the contact area with the friction disc shall not be less than 80%; temperature measurement system error shall not exceed ± 10C, and the measurement error of the friction measurement system shall not exceed ± 15N; Rotation speed, positive pressure loading and other parameters of the friction disc also have detailed requirements.