tool joints, we supply tool Joints are made of AISI 4137 premium alloy steel fully and machined by CNC lathes. All connections are phosphates, 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. Different sizes can meet your requirements. Welcome your inquiry.