1.Adopting the advanced production line crack detecting,
quenching, the continuous overall tempering and sand blasting
processes to achieve higher mechanical strength ability with
overall good performance.
2. The thread is cut by the special-purpose numerical control lathe which keeps the rod body
still when cutting the threads. The special process ensures a
high precision of thread with better reliability and life-span.
3.Use the raw materials with high mechanical strength and
good comprehensive properties.
4.Screw using special CNC machining,and it in manufacture
of high precision,operational safety and long life.
5. Casing coupling using the phosphating treatment,
good wear resistance,good corrosion resistance,good thermostability. |