What surface treatment is applied to the couplings?

The couplings undergo galvanized surface treatment to enhance corrosion resistance.

What thread types are supported for casing and tubing?

Casing couplings support STC, LTC, and BTC threads, while tubing couplings support EUE and NUE threads. Premium options like Vam Top and TPCQ are also available.

Where is the company located and where do they export?

The company is located in Tianjin, China, and exports to 31 countries including North America, Europe, Asia, and the Middle East.

Tubing and Casing Coupling with Different Steel Grade Premium Connection API 5CT 5b OCTG Pipes Couplings

Name: Tubing and Casing Coupling with Different Steel Grade Premium Connection API 5CT 5b OCTG Pipes Couplings
Brand: Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.
SKU: 2076955682

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

US$7.96

50 Pieces

Sample price:US$25.00/piece.Request sample

Product profile

Warranty

1years

Manufacturing Process

CNC Milling

Surface Treatment

Galvanized

Name

Tubing and Casing Coupling with Different Steel Gr

Grade

K55 J55 L80 N80 P110

Thread

EU Nu Bc LC Sc

Usage

Oil Pipe

Specification

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

Trademark

EASTLONG

Origin

Puyang China

HS Code

7307990000

Production Capacity

5000 PCS One Day

Key features

API 5CT Certified Quality: Authorized API 5CT certificate and ISO9001/14001/45001 certifications ensure premium quality.

Wide Grade Compatibility: Supports multiple steel grades including J55, K55, L80, N80, and P110 for diverse applications.

Versatile Thread Options: Offers various thread types such as STC, LTC, BTC, EUE, NUE, Vam Top, and TPCQ.

CNC Precision Manufacturing: Manufactured using advanced CNC milling processes for high precision and durability.

Galvanized Surface Treatment: Galvanized surface provides excellent corrosion resistance and longevity in harsh environments.

Easy Maintenance Design: Threaded connection design allows for easy repair or replacement of damaged pipes.

Established Manufacturer: National high-tech enterprise established in 1999 with 46 engineers and 50+ IP rights.

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

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.