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ASTM A53 NPT Pipe Threaded Couping Steel Tube. Customized End and Surface: End is threaded, surface is galvanized, standard is BS21/NPT. 180 Days Warranty: Quality guarantee covers 180 days for all products. ISO9001:2000 Certified: Manufactured in strict accordance with ISO9001:2000 quality system. Free Samples Available: Stock samples available; customized samples take 5-7 days. Customized Logo and Packaging: Includes customized packaging, logo, and graphic customization. ERW Welded Technique: Produced using Electric Resistance Welding technique. Multi-Industry Usage: Suitable for pipeline, boiler, oil/gas, food, chemical, and construction. Round Section Shape: Standard round shape for steel tubes.