The Integral Lifting Sub is a specialized tool for lifting drilling tool in the course of drilling in petroleum, natural gas industry and geological exploration. Drill tool lifting sub is divided into a or b type structure. The a type has 18 degree shoulder, the b type has 90 degree shoulder. The lifting sub can be selected according to elevator structure. Integral lifting subs are made of high strength alloy steel. All connections are complied with API spec -7-1 It is convenient in operation, safe and reliable in use.
