1 Inch NPT Threaded Galvanized Steel Pipe (DN25/NPS1) is a professional fluid transmission pipe fitting compliant with North American standard piping systems. Made of high-quality carbon steel pipe substrate and processed by hot-dip galvanizing technology, the pipe ends are precisely threaded with ANSI/ASME standard NPT tapered pipe threads. It is a universal core pipe widely used in water supply and drainage, oil and gas transmission, fire protection, mechanical equipment, municipal engineering and other scenarios.
Core Specifications
This product features a nominal diameter of 1 inch (DN25) and an outer diameter of 33.7mm, with common wall thickness ranging from 2.0mm to 3.2mm and a standard length of 6 meters (custom cutting available). The NPT thread strictly adopts 1:16 taper, 60° thread angle and 11.5 threads per inch. It realizes self-sealing through thread taper engagement without additional gaskets, delivering stable sealing performance and perfect compatibility with all kinds of North American standard pipe fittings and valves. The galvanized layer complies with ASTM A90 standards with uniform, dense and high-adhesion coating. The conventional zinc layer thickness is above 45μm, and the thickened anti-corrosion version reaches 85μm, effectively isolating moisture, acid and alkali corrosion to extend the pipe service life.
Key Product Advantages

Reliable Sealing & Wide Compatibility: High-precision standard NPT tapered threads ensure tight engagement and zero leakage. Fully compatible with North American industrial piping systems, it adapts to hydraulic, pneumatic and low-pressure fluid transmission working conditions with easy installation and high fault tolerance.
Solid Material & Stable Pressure Resistance: The high-strength carbon steel substrate features uniform wall thickness, high toughness and excellent pressure-bearing capacity. Free of trachoma, cracks and deformation, it supports long-term stable operation and meets safety standards for industrial and civil piping systems.


Exquisite Craft & High Installation Efficiency: The pipe mouth is flat and smooth with burr-free standard threads and precise unified dimensions. It is easy to disassemble and tightly dock without complicated sealing accessories, greatly reducing construction cost and installation time.
Application Scenarios
Widely used in water supply and drainage piping systems, fire sprinkler systems, mechanical equipment pipelines, agricultural greenhouse pipelines, municipal engineering, ship supporting facilities, HVAC pipelines and other fields. It is the preferred pipe for foreign trade projects, overseas equipment and North American standard engineering projects.
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