In China auto companies have begun to extensive use 30° variable tooth type locking thread. in the car. China National Heavy Duty Truck uses the thread tap of 30° variable tooth type locking thread to process the thread holes of transmission housing of heavy truck, abandons chemical glue and lock washers, simplifies the assembly process and solves the problem of loose bolts. Through our continuous research and testing, we now succeed in providing high-quality locknut for axle to Shaanxi Hande, Guangxi Fang Sheng axles and other companies. Meanwhile, Zhengao locknuts are also used in the gear box, through shaft and other parts. At present, high vibration locknut major OEMs in the country to promote the use, using the results our customers have been recognized At present, Zhengao’s locknut are widely used in the major OEMs in the country, the using results have been recognized by our customers.