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api octg manufacturer/supplier, China api octg manufacturer & factory list, find qualified Chinese api octg manufacturers, suppliers, factories, exporters & wholesalers quickly on Made-in-China. OCTG API 5CT 13-3/8'' Casing Pipe Coupling Oil Field The couplings produced by our company are good at stable quality which the technical parameters are completely complied with the requirements of API5CT and API5B latest standards. Meanwhile, the company has equipped with more than 30 sets CNC threading machines, is able to produce variety of steel grade couplings include STC, LTC, BTC and NU

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