For keeping linear effect during heading road, it adopts special geological steel and advanced friction welding method with following features: high strength, super bend-resistance strength, stable welding, long service life, etc. With the material of top quality alloy that passed heat treatment, the connector has features of powerful weariness-resistance and top shear-resistance. All the machining equipments are advanced numerical control lathe with top efficiency and quality.

Geologic Drill Rod and Coupling