This product is made of high quality cold heading steel, and the thread is rolled by three wheels. Compared with traditional turning, it has the advantages of thread strength, high precision and low roughness. The surface is treated with zinc-nickel alloy coating and special treatment to reduce the friction coefficient, which has the characteristics of high corrosion resistance and low friction coefficient. Commonly used thread M10X1.0,M12X1.0, etc., installed in the automobile brake pipeline. In order to meet customers' requirement of zero defects in product quality, the company adopts optical screening instrument for full-size inspection while strictly controlling the process, so as to meet customers' requirement of zero defects in product quality. This product has been used in many domestic cars.