Our SD drill rods produced by CNC machine, and choose high grade steel material thru heat treatment of the steel tube & thread joint to improve the steel material streagth and insurance the thread wear life.

The joint of the drill rod is made of high grade alloy structure steel. Through high pressure forming process, vacuum hardening and tempering precessing, friction welding process, entirely surface hardening processing.

The screw of joint is made by automatic process equipment, it effectively guarantee the precision of each piece product, the craft of friction welding before screw process, this ensure the best alignment standards of drill pipe connection when drilling longhole, it compares with the similar kinds products, it has high bending strength, large rotary torque, smooth running, etc. characteristics.

It also has higher fatigue strength and longer useful life.