Tool joint are turned, bored and faced prior to heat treatment by the Quench and temper process to produce a uniform microstruct-ure, high ductility, and other mechanical properties in acco- rdance with API specifications. The heat treatment is done under contro- lled atmophere for consistent quailty. 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 mag-netic 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