Zhejiang Zhuji Benbao Spring Co., Ltd is one of the Chinaâs leading spring manufacturers, focusing to provide customers a quality product at a competitive price. We are ISO 9001 Certified and an OEM & after-market manufacturer.Benbao Spring manufactures an extensive range of springs , mainly includes , Compression spring, Extension spring, Torsion spring, Belleville washer, Conical (Tapered) Springs, Wave spring, Die spring, Wire form, Punching component .Springs are supplied to a diverse range of applications and industries. Automotive , Pneumatic / Hydraulic, Mining, Medical Device, Office Furniture, Domestic Appliance Agriculture & Fisheries Hardware.Benbaoâs spring wire includes:Carbon steel Music wireChrome Silicon Chrome Vanadium Oil Tempered Stainless Steel Stainless Steel 17-7ph Phosphor Bronze Copper Inconel - X750 and 600Brass Beryllium Copper Rectangular Square Other wire available upon request Engineering CapabilityOur Expert Engineering Staff can work from your drawings, specifications or part samples.We offer Concurrent Engineering support, assisting you in developing your initial designs and continuing to support your product throughout the design and manufacturing process.Quality CommitmentCommitment to quality is an intrinsic part of our coil spring manufacturing process. The most advanced manufacturing machines and complete test equipments as well as professional inspection staff ensures product conformity to the most precise requirements of its customers, We also enjoy 'Preferred Supplier Status' with many of its customers. âAll products are manufactured and supplied within the scope of ISO:9001 âFull product testing facilities are available to ensure product conformance with detailed certificates of conformity, material test certification and load/rate printouts available on request