Tool joint are turned, bored and faced prior to heat treatment by the Quench and temper process to produce a uniform microstructure, high ductility, and other mechanical properties in accordance with API specifications. The heat treatment is done under controlled atmophere for consistent quality. The tensile and impact properties are verified by destructive testing of a tool joint representing each process batch, every tool joint is subjected to wet magnetic particle inspection,
both transverse and longitudinal, to insure the absence of defects.

Threads are precision machined on CNC lathes. All connections are 100%inspected for thread parameters and phosphatized or copper plating for antigalling treatment.