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China, Chinese 5 1/2 LC N80q Casing Coupling1 Industrial Products Supplier Manufacturer Details, price list catalog:
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Petroleum Equipment MachineryOther Petroleum Equipments MachineryN80q Casing CouplingOCTG Casing Accessories
Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.
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Product DescriptionCompany Profile TianJin Dongfanglong Machine Manufacture Co., Ltd was established in 1999 and is a national high-tech enterprise concentrating on petroleum specialized pipes, petroleum specialized drilling and production tools, and petroleum specialized automation equipment. The company has 46 engineers and highly skilled talents, over 50 independent intellectual property rights, and have created the industry's first professional e-commerce platform, the "Dongfang Yunlong E-commerce Platform". It has formed an industrial chain that integrates the design, research and development, manufacturing, sales, testing and experimentation,and technical services of petroleum machinery products and CNC automation equipment, which can meet customers' full cycle service needs for products. Since its establishment, the company has successively passed the ISO9001 quality system, ISO14001 environmental management system, ISO45001 occupational health and safety management system certification, HSE health, safety and environmental management system certification, and integration management system certification. In 2007, the company obtained the API 5CT certificate authorized by the American Petroleum Institute and the quality supplier assessment certificate issued by BV France. With excellent system management and quality control, Dongfanglong won the "Mayor of Puyang City Quality Award"; Dongfanglong utilizes a large digital platform as its carrier to fully integrate customer resources, analyze customer types, expand business types, and conveniently and quickly complete cross-border electronic business. It aims to focus on the company's proprietary products, drive the sales of petroleum machinery in the industry, and quickly occupy and expand the market share of petroleum machinery products through e-commerce platform sales. By continuously cultivating and introducing sales elites, improving the official website sales platform, and increasing international promotion investment, our products are exported to 31 countries and regions such as the United States, Russia, and the United Arab Emirates.Please enter the title here1.Raw Material InspectionChemical composition and mechanical properties of N80Q steel are tested to ensure API 5CT compliance.2.CuttingSteel bars are cut into exact lengths for coupling production.3.Heating & ForgingThe material is heated and forged into rough coupling shape to improve density and grain structure.4.Heat Treatment (Quenching & Tempering)Couplings are heat treated to meet N80Q grade hardness and strength requirements.5.Rough & Finish MachiningCNC lathes are used to precisely machine the outer/inner diameters and prepare for threading.6.Thread Cutting (LC Type)Long Round Threads (LC) are cut according to API standards, followed by thread gauge inspection.7.Non-Destructive Testing (NDT)Eddy Current Testing (ECT) is applied to detect surface and sub-surface defects.8.Surface TreatmentPhosphating or anti-rust oil is applied to prevent corrosion during storage and use.9.Thread Protector InstallationPlastic or metal thread protectors are installed to prevent shipping damage.10.Packing & DeliveryPacked in wooden cases or pallets with full documentation, including MTC and API compliance certificates.Product DetailsOur 5 1/2" LC N80Q casing coupling is designed for reliable performance in oil and gas well applications. Manufactured in accordance with API 5CT and API 5B standards, this coupling provides excellent strength, sealing integrity, and corrosion resistance. It is ideal for connecting N80Q-grade casing pipes in medium-to-deep wells and high-pressure environments.SpecificationApplicationsOil & Gas Drilling: Casing connection in vertical and deviated wellsDeep Well Projects: High-pressure casing integrityGeothermal Wells: Thermal resistance and tight connectionOnshore/Offshore Exploration: Harsh well environmentsWell Completion: Structural support and seal integrityKey ConfigurationsSteel Grade: N80Q heat-treated carbon steel (API 5CT)Thread Type: LC (Long Round Thread)Outer Diameter: 5 1/2 inches (139.7 mm)Connection: Internal thread coupling, matches casing threadSurface Finish: Black coating / phosphated / rust-proof oilInspection: Eddy current test, thread gauge check, hardness testStandard: API 5CT / API 5BCompatibility: Fits N80Q casing pipes with LC threadTechnical SpecificationsItemValueCoupling OD5 1/2" (139.7 mm)Thread TypeLC (Long Round Thread)Steel GradeN80QMaterialHeat-treated carbon steelSurface TreatmentBlack coating / phosphating / anti-rust oilLengthStandard API lengthConnectionFemale thread (LC)Usage EnvironmentMedium-deep wells, high pressure zonesInspectionEddy current + thread gauge + visualCertificationAPI 5CT / API 5BPackagingWooden cases or pallets with thread protectorsFAQQ: Can I customize the thread type or steel grade?A: Yes, we support API EUE, NU, LC, BTC, and premium thread options.Q: What's the delivery time?A: Normally 15–25 days for standard couplings; custom orders may take 30–40 days.Q: What export documents do you provide?A: Commercial invoice, packing list, MTC, certificate of origin, API license copy, etc.Q: How can I place an order?A: Contact us via email or phone to confirm specs and place a purchase order.Why Choose Us?API Certified FactoryCompetitive Price with OEM ServiceFast Delivery & Export AssistanceStrong After-Sales SupportGlobal Supply CapabilityCustom Engineering Service
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