The standard of the flange
Flange standard another meaning is: according to national standards flange size, tolerance range of production, the difference in production is not according to the standard size of flange is also called second standard flange (someone called non-standard flange is not correct), usually some unscrupulous merchants will reduce two flange thickness, diameter size to achieve the purpose of saving material, and made from scrap steel and scrap steel flange.
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