Tool joints
Tool joints are set for welding onto drill pipes. They are manufactured with box thread and with pin thread. One tool joint with box thread and one tool joint with pin thread create a couple. One tool joint with pin thread and one tool joint with box thread are welded-on to ends of drill pipe manufactured in accordance with API SPEC 5D.
Material: Tool joints are produced from heat treated alloy steel. Mechanical properties of tool joints material comply with minimum requirements of API SPEC 7 and they are shown in table.