What sizes are available for the coupling?

Sizes range from 1.9 inches to 20 inches, including 4-1/2', 5', 5-1/2', 6-5/8', 7', 7-5/8', 8-5/8', 9-5/8', 10-3/4', 11-3/4', 13-3/8', 16', 18-5/8', and 20'.

Where is the product manufactured?

The product is manufactured in Tianjin, China.

China Supplied Oil Well API 5CT Tubing/Casing Pipe Coupling1.9"-20"

Name: China Supplied Oil Well API 5CT Tubing/Casing Pipe Coupling1.9"-20"
Brand: Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.
SKU: 2060410032

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

US$3.65

500 Pieces

Sample price:US$30.00/piece.Request sample

Product profile

Warranty

1year

Name

China Supplied Oil Well API 5CT Tubing/Casing Pipe

Thread

Nu EU Bc Sc LC

Model NO.

1.9"-20"

Grade

K55 J55 N80 L80 P110

Usage

Oil Pipe

Transport Package

Wooden Pallet

Trademark

EASTLONG

Origin

Puyang China

HS Code

7307990000

Production Capacity

5000 PCS One Day

Key features

API 5CT Certification: Certified by American Petroleum Institute for oil well tubing and casing.

ISO Quality Management: Passed ISO9001, ISO14001, and ISO45001 system certifications.

Wide Size Range: Available in sizes from 1.9 inches to 20 inches for various applications.

Multiple Steel Grades: Offers J55, K55, L80, N80, and P110 grades to meet diverse needs.

Fast Lead Time: Production completed within 15 workdays during peak and off-peak seasons.

1-Year Warranty: Comprehensive 1-year warranty coverage for product reliability.

Global Export Experience: Products exported to 31 countries including USA, Russia, and UAE.

Advanced Surface Treatment: Options include whole phosphating or inside phosphating with outside coating.

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: ≤11.22hTerms 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.