Eue Threaded Coupling 3-1/2" P110 for Sour Service Wells

• Warranty: 3 Months
• Certification: API 5CT
• Power Source: No
• Model NO.: 3-1/2
• Operation Pressure: 0
• Structure: Plug-In
• Material: Cast Steel
• Transport Package: Wood Pallet
• Trademark: DFL
• Origin: China
• Production Capacity: 20000pieces/Months

Product Description

High-Quality Casing Couplings for Oil & Gas Applications

Tianjin Dongfanglong Machinery Manufacturing Co., Ltd. is a trusted manufacturer of API-certified casing couplings, providing reliable connections for oilfield casing strings. Our couplings are engineered to meet stringent industry standards, ensuring leak-proof performance, durability, and easy installation in demanding drilling environments.

Specification

 Key Configurations

1,Premium Material Grades – Manufactured from high-strength carbon/alloy steel (J55, K55, N80, L80, P110, etc.)

2, API-Compliant Threading – Available in STC (Short Thread), LTC (Long Thread), BTC (Buttress Thread), and premium connections

3, Superior Sealing Performance – Precision machining ensures gas-tight and pressure-resistant connections

4, Corrosion Protection – Optional coatings (zinc, phosphate, or VAM®-style treatments) for extended service life

5, Custom Solutions – OEM support for non-standard sizes, special threads, or material requirements

Technical Specifications

Standards: API 5CT, ISO 11960
Size Range: 1.315" to 4-1/2" (custom sizes available)
Thread Types: EUE ,NUE, or proprietary premium connections
Pressure Rating: Suitable for HPHT (High-Pressure High-Temperature) applications
Inspection: 100% dimensional check, hardness test, and pressure testing

Company Profile

Tianjin Dongfanglong Machinery Manufacturing Co., Ltd.

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";

Why Choose Us?

Other Products

*API-Certified Manufacturing – Full traceability with mill test reports (MTRs)
*Competitive Pricing – Direct factory supply with no middlemen Fast *Turnaround – Large inventory for quick delivery Technical Support – Expert
*assistance for your project requirements
*Contact us today for quotes, catalogs, or customized solutions!

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FAQ

Q: What's the lead time for orders?
A: Standard models ship in 15–30 days; customized units require 30–45 days.
 
Q: Do you provide after-sales service overseas?
A: Yes, we have partnered service centers in key regions.
 
Q: What documents do you provide for export?
A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).
 
Q: How do I place an order?
A: Contact us via email/phone for a quote, then confirm with a PO.