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  • Eagle Eyes CHINA Inspection Service (China): Eagle Eyes (CHINA) Quality Inspection Co.,Ltd. is a professional Third... https://www.china-quality-inspection.com
  • Edition Casing Coupling Btc In Stock Conversion Joint - China

    price: 384.00 Dollar US$

    Oil Pipe Coupling Standards

    N80/L80 oil pipe couplings, 27/8” couplings in stock.

    Oil pipe coupling standards: API SPEC 5CT, API SPEC 5B, and the 11th edition of the coupling standard, BTC.

    Material of Oil Pipe Couplings: H40, J55, N801, N80Q, L80, P110 - Specifications of Oil Pipe Couplings: Outer diameter 55.88~141.3 mm (1.9"~4 1/2").

    Thread Types: Nonthickened (NUE), thickened (EUE), special clearance (SCC).

    Purpose of Oil Pipe Couplings: Used to connect two threaded oil pipes and has an internal threaded cylindrical body.

    Specifications: 4 1/2” 20” Standards: API 5CT/5B, the 11th edition of the coupling standard, BTC.

    Manufacturers of Oil Pipe Couplings, Extended Oil Pipe Couplings, Special Clearance Couplings.

    Casing Couplings: Processing thread types STC (Short Round Coupling), LTC (Long Round Coupling), BTC (Buttress Coupling).

    Oil Pipe Couplings: 23/8'', 27/8'', 31/2'', 41/2''; Thread types: NUE, EUE.

    Casing Couplings: 41/2'', 51/2'', 65/8'', 7'', 95/8'', 103/4'', 133/8'', 20''; Thread types: STC, LTC, BTC.

    1 - We provide coupling blanks (according to API SPEC 5CT (9th edition) requirements) with quality specifications and related certifications to ensure that the coupling blanks are produced according to API requirements.

    2 - Thread inspection of casing couplings according to the 11th edition of the coupling standard, BTC.

    3 - Thread processing for couplings, including tight distance, tooth height, pitch, taper, and other parameters, is inspected according to API Spec 5CT (9th edition) and API Spec 5B (15th edition); all dimensional and thread parameter inspections must be well documented.

    4 - The surface of the threads must be smooth and free of significant tearing, tool marks, abrasion marks, shoulders, or any other defects that disrupt the continuity of the threads; internal and external chamfers and starting threads must be free of burrs and other flaws.

    5 - The critical thickness of the coupling should be specified.

    6 - Internal and external edges of the coupling should be rounded, with R≥0.5 mm, and the edges on the bearing surface of the coupling should be chamfered.

    7 - Thread flaw detection.

    We sincerely look forward to your inquiries! We are dedicated to serving you!


    Company Contact:


    • Phone: +8618222899636

    • Address: No.17 Guanghai Road,Economic Development Area Jinghai District.Tianjin City., Tianjin , Tianjin , China

    • Email: Email


    Published date: April 29, 2025

    • Business Description: Tianjin Grand Victory Petroleum Equipment Co., Ltd. is a comprehensive enterprise for production, processing, sales, technology research and development, and spot storage.

      Located in Jinghai District, Tianjin, China, it was founded in 2008 with a registered capital of 11.18 million yuan.

      It has import and export rights, ISO9001 quality system certification, American Petroleum Institute API 5CT certification and a number of national patent certificates.

      The production workshop is equipped with several types of equipment such as highprecision CNC lathes, thread tightening machines, hydraulic presses, etc., and complete inspection and measurement instruments.

      Products include J55, K55, N801/Q, L80, P110 and other oil casing, couplings, Pup Joint、Xover (Cross over); 80S, 90S, 110S, L801Cr/3Cr/13Cr and other highcorrosion resistant oil casing spot storage, with a longterm reserve of about 2,000 tons.

      At the same time, it undertakes the processing and copper plating of special sealing threads such as direct connection, wedge shape, double step, variable pitch, etc.

      for oil well pipes and petroleum accessories, with fast delivery and excellent quality, reducing costs and increasing efficiency for customers.

      Our vision: to build an international oil pipeline equipment enterprise with integrity and innovation.

      We welcome leaders and friends from all walks of life to visit us for cooperation and common development.

      Our Products:

      - Special Api 5ct Standard Oil Well Pipe

      - Tubing Large Size N80 Steel Grade Short Connection

      - Component Bgt2 Type J55 High Sealing Vam Special Thread

      - T95 Coupling Special For Oil Pipeline L80 Material N80 Steel

      - Corrosion Resistant Design J55 Thread Protection

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