Flange bolts are made up of a hexagonal head and a flange (the gasket under the hexagon is fixed together with the hexagon) and a screw (a cylinder with external threads). They need to be matched with nuts to fasten parts that connect two through holes. Flange bolts are made up of a hexagonal head and a flange. Their support area to stress area ratio is greater than that of ordinary bolts. Therefore, this type of bolt can withstand higher preload and has better anti-loosening performance. Therefore, it is widely used in automobile engines, heavy machinery and other products.
