Jiangsu YingNaiSi Machinery Manufacturing Co., Ltd.

Jiangsu YingNaiSi Machinery Manufacturing Co., Ltd. is located in Wujin District, Changzhou City, Jiangsu Province. As a national‑level high‑tech enterprise, we have obtained ISO9001 Quality Management System and ISO14001 Environmental Management System certifications, hold multiple independent technical patents, and are entitled to self‑operated import and export business. Starting with precision steel tube manufacturing, the company has developed two major business divisions: the Steel Tube Division and the Hydraulic Cylinder Division. The Steel Tube Division specializes in precision cold‑drawn, cold‑rolled and skived‑roller‑burnished (SRB) processing. Our tubes feature high dimensional accuracy and excellent surface finish, widely applied in oil‑production equipment, engineering machinery, textile machinery, lubricant equipment and other industries. The Hydraulic Cylinder Division focuses on R&D and design of high‑pressure cylinders for excavators and high‑end non‑standard hydra…