What is the after-sales service policy?

We offer 12 months of after-sales service for this product.

What is the structure type of the coupling sub?

The coupling sub features a plug-in structure.

Durable Threaded Coupling Sub for Efficient Oil Tubing Solutions

Name: Durable Threaded Coupling Sub for Efficient Oil Tubing Solutions
Brand: Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.
SKU: 1983280821

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

US$4.00

1-49 Pieces

US$3.80

50-199 Pieces

US$3.60

200+ Pieces

Product profile

After-sales Service

12 Months

Warranty

6 Months

Certification

ISO 9001:2000, ISO 9001:2008

Model NO.

2-7/8

Power Source

Non

Operation Pressure

Non

Applicable Medium

Natural Gas, Crude Oil

Structure

Plug-In

Material

Cast Steel

Transport Package

Wooden Case

Trademark

DFL

Origin

China

Key features

Premium Threaded Design: State-of-the-art threading technology ensures secure fit and reduces leak risks.

High Durability Material: Constructed from Cast Steel with L80, J55, and N80 steel grades for oil tubing.

Versatile Application: Suitable for Natural Gas and Crude Oil with plug-in structure and non-power source.

Quality Certified: Manufactured under ISO 9001:2000 and ISO 9001:2008 standards.

Fast Lead Time: Average lead time within 15 workdays for both peak and off-peak seasons.

Flexible Payment: Supports LC, T/T, PayPal, and Western Union payment terms.

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.