What payment terms are accepted?

We accept LC, T/T, PayPal, and Western Union as terms of payment.

How are the products packaged?

Products are packaged on wooden pallets, tightly wrapped, or in paper cartons for safe transport.

What is the difference between EUE and NUE?

EUE couplings have a larger outer diameter and higher joint strength (100% efficient), while NUE has a smaller diameter and is used when clearance is limited.

2 with Coupling

Name: Tubing and Casing Coupling2-3/8 2-7/8 3-1/2 with Coupling
Brand: Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.
SKU: 2137854932

Tianjin, ChinaTianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.

US$12.65

500 Pieces

Product profile

Warranty

1 Year

Name

Tubing and Casing Coupling2-3/8 2-7/8 3-1/2 with C

Thread

Nu EU Bc LC Sc

Model NO.

2-3/8 2-7/8 3-1/2

Grade

K55 J55 N80q L80-1 P110

Usage

Oil Pipe

Transport Package

Wooden Pallet

Trademark

EASTLONG

Origin

Puyang China

Production Capacity

5000 PCS One Day

Key features

API 5CT Certified Quality: Products meet API 5CT/5B standards with ISO9001, ISO14001, and API 5CT certifications.

Wide Size Range Available: Sizes from 2-3/8" to 4-1/2" in both EUE and NUE types for various applications.

Multiple Grade Options: Available in J55, K55, N80, L80, and P110 grades to suit different pressure requirements.

100% Joint Efficiency: EUE couplings offer joint strength in tension and pressure greater than the pipe body.

Comprehensive Testing: Includes tensile, impact, chemical, and sulfide stress cracking tests for quality assurance.

Global Export Experience: Exported to 31 countries including USA, Russia, and UAE with established international trade.

1-Year Warranty Coverage: Standard 1-year warranty provided for all tubing and casing coupling products.

Professional Manufacturer: Established in 1999 with 46 engineers and over 50 independent intellectual property rights.

Company profile

Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.Tianjin, China

Business Type: Manufacturer/FactoryExport Year: 2019-06-07Nearest Port: TIANJIN PORT, QINGDAO PORT, SHANGHAI PORTAverage Response Time: ≤15hTerms of Payment: LC, T/T, PayPal, etc.International Commercial Terms(Incoterms): FOB, EXW, CIF, DDP

AI-Powered supplier vetting

SummaryTianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd. is a China-based manufacturer founded in 1999, focused on oil pipes, pipe fittings, drilling and production tools, and petroleum automation equipment. The supplier reports ISO 9001 and ISO 14001 certification, 10 production lines, 11–20 years of R&D engineer experience, and 11–20 quality-control staff. It states that its capabilities cover design, development, manufacturing, testing, experimentation, and full-cycle service, supported by more than 30 independent intellectual property rights and an intelligent workshop. The company exports to broad global markets and reports export activity since 2019, but the provided information does not identify specific customer cases or independently verify the stated capabilities.

Supplier typeThe supplier is explicitly identified as a Manufacturer/Factory and a limited company based in Tianjin, China. Its stated business focuses on petroleum equipment, oil pipes, pipe fittings, drilling and production tools, and automation equipment, matching the listed industrial product categories.

CertificationsThe supplier reports holding ISO 14001 and ISO 9001 management-system certifications. These are explicit certification records in the provided data, although certificate scope and validity dates are not given.

R&D capabilityThe supplier reports more than 30 independent intellectual property rights, an intelligent workshop, numerical-control automation equipment capabilities, an e-commerce platform, and recognition as a national science and technology-based small and medium-sized enterprise. These statements provide explicit evidence of innovation-related infrastructure and activity.

Production capacityThe supplier describes an integrated chain covering design, development, manufacturing, testing, and experimentation; operates 10 production lines; and has an intelligent workshop. It also reports oil equipment and pipe-related manufacturing experience, with stated order fulfillment within 15 workdays in both off-peak and peak seasons, supporting a positive production-capability assessment.

Customization capabilityThe stated full-cycle integration of design, development, manufacturing, testing, and experimentation, together with numerical-control automation equipment and an intelligent manufacturing model, indicates the ability to develop and manufacture tailored petroleum equipment. However, no specific customized project examples, engineering-change process, or minimum-order requirements are provided.