| After-sales Service: | Replacement Within Warranty |
|---|---|
| Warranty: | Three Months |
| Certification: | API |
|
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Our precision-engineered 5 1/2" LC NQ coupling is designed for connecting drill rods in core drilling, mining, and geotechnical exploration. Manufactured from high-strength alloy steel and heat-treated for maximum durability, this coupling ensures excellent thread engagement, fatigue resistance, and long service life in demanding drilling conditions.
Technical Specifications
(Custom sizes and thread types available upon request.)
| Parameter | Value |
|---|---|
| Model | LC-NQ-5.5 |
| Outer Diameter (OD) | 5 1/2" (139.7 mm) |
| Thread Type | NQ Thread - Left or Right Hand |
| Coupling Length | 150-200 mm |
| Material | 42CrMo / 4145H Alloy Steel |
| Thread Connection Type | LC (Long Coupling) |
| Surface Treatment | Black Oxide / Zinc Plated / Plain |
| Heat Treatment | Quenching + Tempering (HB 241-286) |
| Application | Core Drilling, Mining, Exploration |
Material: High-strength alloy steel, precision-machined for excellent concentricity
Thread: NQ LC thread, fully interchangeable with major drill systems
Treatment: Full-body heat treatment for strength and anti-fatigue performance
Fitment: Compatible with NQ drill rods and core barrels
Finish: Anti-corrosion surface finish with protective thread caps
Inspection: 100% thread gauge inspection before shipment
Mining Exploration - Core sampling and borehole drilling
Geotechnical Survey - Soil and rock investigation
Hydrogeology - Groundwater extraction & monitoring
Tunnel & Slope Engineering - Anchor drilling and stability testing
Oilfield Geological Survey - Preliminary subsurface drilling
Standard Warranty: 3 months from delivery or per agreement
Technical Support: 24/7 online consultation available
Replacement Policy: Free replacement for quality issues
Customization Support: Threads, dimensions, and steel grades customizable
Detailed CAD drawings or 3D models can be provided upon request to meet specific compatibility and installation requirements.
Dongfanglong Drilling Equipment Co., Ltd.
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.
Q: Can I request a custom length or thread?
A: Yes, LC couplings can be made in various lengths and thread styles.
Q: Do you offer NQ HQ PQ couplings as well?
A: Absolutely, all major sizes including BQ, NQ, HQ, PQ are available.
Q: What's the delivery time?
A: Typically 7-15 working days depending on quantity.
Q: How is the product packaged?
A: Individually with plastic thread protectors, bundled in wooden box or steel frame.
Q: What documents are provided for export?
A: Invoice, Packing List, Certificate of Origin, Mill Test Report, etc.
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