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API standard oilfield drill tool Lifting sub, lift nipple
Lifting sub is a special tools one-piece construction for lifting of the drill tools in petroleum, natural gas industry. Lifting sub comes as tapered shoulder ( 18 degree shoulder) and square shoulder ( 90 degree shoulder) two types and is available in all diameters and lengths. All lifting subs are complied with API standard.
Our company lays emphasis on product quality. Product quality is controlled strictly according to API standard and customer's special requirement: appearance inspection, dimension inspection, chemical & physical properties inspection; performance test, NDT, strength test, tensile test, hardness test, welding zone test& inspection, etc. All the measures ensure our products qualified.
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