Drill subs are made from top-grade alloy steel. They possess great hardness and excellent thread smoothness. In addition, we have developed a kind of special hardening technique which is used for the secondary hardening of the threads of adaptor subs. This technique can overcome the thread jam and lapped seam problem. In comparison with ordinary drill subs, the China Drilling’s drill sub increases lifespan by 60% to 70%.
China Drilling Geological Equipment Co., Ltd.
Add.: No. 8, Furong 4th Road, Xishan District, Wuxi City, Jiangsu Province, China
Contact Person: ChuWei Wang
Tel.: +86-510-82799092
Fax: +86-510-82792833
Mobile: +86-13771027795
Email: wcwcndrillingbits@gmail.com