The dimensions of dn300 flange are: flange outer diameter 460mm, bolt hole spacing 4 10mm, bolt diameter 26mm, bolt hole number 12mm, and flange thickness 32mm. Flange is just a general term, which usually refers to a disc-shaped metal body with several holes on it to fix other things. This thing is widely used in machinery, so it looks strange. As long as it looks like a flange, the name comes from the English flange. Flanges are also called flanges or flanges. Connect the interconnected parts of the pipeline to the end of the pipeline. There are holes in the flanges, and bolts make the two flanges closely connected. The flange is sealed with a gasket.