Xuzhou Zhongya Construction Machinery Co., Ltd is mainly engaged in design and produce machinery products.The main products are slewing bearings, gears, etc.All the blanks for Zhongya slewing bearings are performed by hardening and tempering, hardness can reach HB220-280, the strength is much higher than national standard of GB/T 3077 and GB/T 699, raceway using medium frequency induction hardening machine, hardness can reach HRC55-62, the depth is bigger than 5 mm, inner steel balls are treated by steel ball crushing test to ensure the load of the core.Zhongya slewing bearings have many advantages: compact structure, light weight, low noise, smooth operation, high precision, safe and reliable, it can bear the axial force, radial force and overturning moment, it doing good on bearing heavy load and low speed.We can survey, design and produce all kinds of non-standard spur gear gears, helical gears and bevel gears according to customers special requirements. Advanced production equipment and complete testing equipment to ensure the reliable quality, high performance, reasonable price, short production time.Xuzhou Zhongya Construction Machinery Co., Ltd is committed to building brand by the quality, reputation to win the cooperation.Cooperation with Zhongya today, success in the future!