What certifications does the product hold?

Our products are certified under ISO 9001:2000 and comply with API 5CT standards.

What is the maximum outer diameter for tubing couplings?

Typically, tubing couplings have a maximum outer diameter of 4 1/2 inches, suitable for housing sucker rods in drilling operations.

Where are the products shipped from?

We ship from Tianjin Port, Qingdao Port, and Shanghai Port in China.

API 5CT Tubing and Casing Coupling

Name: API 5CT Tubing and Casing Coupling
Brand: Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.
SKU: 2132655922

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

US$4.55-4.65

100 Pieces

Product profile

After-sales Service

1 Year

Warranty

1 Year

Certification

ISO 9001:2000, API 5CT

Model NO.

4 1/2 EUE N80Q

Surface Treatment

Spray-Paint

Centralizer Type

Semi-Rigid

Structure

Roller

Material

Cast Steel

Type

Casing Head

Connection Type

Connection Type: Threaded (Stc, Ltc, Btc), Integra

Manufacturing Processt

- Seamless Pipeline: Produced Via Hot Rolling or C

Mechanical Properties

Tensile Strength: 415 MPa - 630 MPa (Varies by Ste

Transport Package

Wood Pallet

Specification

1.66"-20"

Trademark

Eastlong

Origin

China

HS Code

730429

Production Capacity

1000000PCS/Year

Key features

API 5CT Certified Quality: Meets ISO 9001:2000 and API 5CT standards for oil and gas industry reliability.

High Strength Materials: Available in K55, J55, N80, L80, and P110 grades with tensile strength up to 630 MPa.

Robust Connection Design: Features thickened upset ends (EUE) to minimize fatigue fractures and stress concentration.

Versatile Thread Options: Supports Threaded (STC, Ltc, Btc), Integra, NUE, and EUE connections for diverse needs.

Comprehensive Size Range: Covers tubing ODs from 1.9 to 4.5 inches and casing ODs from 4.5 to 20 inches.

1-Year Warranty Coverage: Includes 1-year warranty and after-sales service for mechanical defects and support.

Custom Manufacturing: Offers custom connection types and manufacturing processes to meet specific project requirements.

Global Export Capability: Exports worldwide with flexible payment terms (LC, T/T) and lead times within 15 workdays.

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: ≤18hTerms 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.