The Tool Joint are made of AISI 4137 premium alloy steel fully and machined by CNC lathes. All connections are phosphatized, coated with lubricant and provided with thread protectors. All tool joints should be inspected at full length by fluorescence magnetic particle and ultrasonic method.Tool joints are for pipes from 2 3/8" to 6 5/8", grade is E 75, G 105 and S 135; upset style is EU,IEU or IU.
Construction
According to the thread, the Tool Joint can be divided into digital type, inner-flat type and full-bore type, and each thread can be divided into right-hand and left hand.
