The drill tool lifting subs are the special tools for lifting of the drill tools in petroleum, natural gas industry and geologic exploration. The drilltool lifting subs are divided into a or b type structure. The a type has 18 DEG shoulder, the b type has 90 DEG shoulder. The lifting sub can be selected according to elevator's structure. The integral lifting subs are made of high strength alloy steel. With strong lifting capacity, reliable and safe feature, the lifting subs can meet with the requirement to lift drill tools in drilling or exploration in deep well or extra-deep well. All specifications are complied with API standard. The integral type lifting sub is made of high-strength alloy. With high bearing capacity and reliable performance, it can meet with the requirement for lifting of drill tool in drilling operation in deep well and extra-deep well.
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