The ANSI/ASME B18.2.2 flange nuts and the general hex nut are basically the same in size and thread specification. Whereas, compared with the ASME B18 2.2 hexagon nut, the gasket and the flange nut are integrated, and there are anti-skid tooth patterns on the bottom, which increases the nut and the workpiece. Compared with the combination of ordinary nut and washer, the ANSI/ASME B18.2.2 flanged nut is firmer and has greater tensile force. The flange nut surface itself has the anti-slip and stop functions of the flat washer and the spring washer, so there is no need to add the flat washer and the spring washer during assembly, which will be counterproductive. It is widely used as automotive flange nuts.