Shandong Longtian Spring Co., Ltd., located in Binzhou, Shandong Province, is one of the most famous spring manufacturers in Northern China. We have been providing high-quality industrial springs for machinery manufacturing enterprises for 30 years. As a member of the China Spring Specialty Association, Chinese Society for Internal Combustion Engines, and Shandong Society for Internal Combustion Engine, Longtian Spring has participated in the formulation and revision of many national standards, developing and designing new types of springs for internal combustion engine institutes of national level, Research Institute of Petroleum Exploration & Development, and national mining machinery institutes. We have passed the ISO 9001-2000 certification in 2015 and promise that each Longtian spring complies with the standard manufacturing process. We owns over 50 most advanced 0.01 to 20 mm numerical control spring coiling machines, several automatic product lines for valve springs, and full set of high-precision spring and raw material detection instruments. Our products include compression springs, tension springs, torsion springs, disk springs, die springs, and micro-pressure springs with multiple raw materials of steel for you to choose. We have a regular stock of nearly 150 thousand products that allow us to dispatch products within 24 hours. We also accept customization for special spring from even just one piece. We are dedicated in the design and production of high-precision industrial springs. As our market share in China grows year by year, our products are gradually discovered and recognized by international customers. We are looking forward to your cooperation with us.