Hangzhou Naizhun Precision Machinery Co., Ltd.

Hangzhou Naizhun Precision Machinery Co., Ltd. is a national high-tech enterprise specializing in the R&D, manufacturing, and global distribution of hydraulic bolting tools. Established with a commitment to engineering precision and manufacturing excellence, our company has grown into a trusted supplier of hydraulic torque wrenches, hydraulic pumps, bolt tensioners, and customized bolting solutions.

With over a decade of manufacturing experience, we have developed 19 patented technologies covering hydraulic torque wrench drive mechanisms, hollow wrench designs, multi-stage hydraulic pump systems, and double-stage cylinder bolt tensioners. Our products are CE certified and manufactured under ISO 9001 quality management system, ensuring consistent performance in the most demanding industrial environments.