Specification :

lifting sub, API standard

lifting sub

1API spec7-1
2for lifting of the drill tools
3divided into a or b type structure
418 or 90 degree shoulder

lifting sub is a special tools for lifting of the drill tools in petroleum, natural gas industry and geologie 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 stell. All connections are complied with API spec7-1.

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