News

Inch ("), DN and Φ, commonly used for industrial pipes and fittings, represent different specification standards – choosing the right one ensures no mistakes. Inch is a unit in the American system, with 1" = 25.4mm (e.g., a 10" valve is made to this standard). DN, widely used in China and Europe, refers to nominal diameter (average of inner and outer diameters), such as DN250, facilitating uniform matching. Φ directly indicates outer diameter, e.g., Φ50mm means an outer diameter of 50mm. OASIS, offers products that meet a wide range of criteria and provide precise selection advice. We can customize the product according to the specifications you provide.