Henan 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";

The company takes the "Dongfang Yunlong E-commerce Platform" as its core and promotes it through multiple platforms, successfully building a?petroleum equipment industry alliance and conducting domestic and international trade. 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.

In the future, Dongfanglong will solidly implement the new development concept, guided by the new development concept of innovation, coordination, green, openness, and sharing. It will closely focus on national policy guidance, formulate a sustainable development transformation strategy, anchor the goal of becoming a century old enterprise and striving for national glory, continuously forge ahead, and work together with people of insight from all walks of life to achieve win-win results, jointly building the dream of soaring petroleum equipment manufacturing.

Crossover subs?are generally Box x Pin with a transition on the outside diameter and the inside diameter of the crossover sub to assure that there are no sharp corners to set up an area of stress risers. When stress risers occur, there is a chance that the part could fail due to the fact that the part would be prone to crack in these areas.

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Crossover coupling is available in a wide range of sizes, weights, lengths and grades with any combination of connections.

a. Diameters - 2 3/8" to 7"

b. Weights - As Per API-5CT.

c. Lengths - Any length.

d. Grades - J-55, K-55, N-80, L-80, P-110

e. Connections - EUE, NUE, STC, LTC, BTC

1.Material:seamless steel
2.Features: It realized to connect the two different specifications of tubing pipes. The placement is male; well mechanical properties,good sealing and connectivity.
3.Adantages: After hot rolling, we can sure the coupling joint has well-proportioned and consistent metallographic structure. Good sealing and loading capacity.
4.Standard Reference:API 5CT

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