Mudanjiang City Linhai Oil Tools Co., Ltd.

Mudanjiang City Linhai Oil Tools Co., Ltd. (牡丹江市林海石油工具有限公司) is a China-based manufacturer of petroleum drilling tools and threaded connections, located in Mudanjiang City, Heilongjiang Province. The company operates within Mudanjiang's established petroleum tool manufacturing cluster, one of China's primary drill pipe and drilling equipment production centers supporting the Daqing Oilfield and northeastern China petroleum operations. Linhai Oil Tools holds three API certifications from the American Petroleum Institute: API 7-1 (Rotary Drill Stem Elements), covering the manufacture of drill pipe, heavy weight drill pipe, drill collars, and related drill string components; API 7-2 (Threading and Gauging of Rotary Shouldered Thread Connections), covering precision threading and gauging services for drill string connections; and API Q1 (Specification for Quality Management System Requirements for Manufacturing Organizations), the foundational quality management system standard for petroleum industry manufacturers. The triple certification combination of API 7-1, 7-2, and Q1 indicates a vertically integrated operation capable of both manufacturing drill stem elements and performing the precision threading operations required for rotary shouldered connections, with a comprehensive quality management system underpinning both capabilities. This positions Linhai Oil Tools as a full-service drill pipe and drilling tool manufacturer capable of delivering finished, threaded, and gauged products ready for oilfield deployment. The Mudanjiang region's concentration of petroleum tool manufacturers reflects the historical supply chain built around the Daqing Oilfield, China's largest onshore oil field, and the broader northeastern China petroleum industry.