M12 304 Stainless Steel Extra-Wide Serrated-Flange Hex Head Screws
These screws have a flange that’s at least 10% larger than a standard flange for more gripping power. The flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. Serrations under the head grip the material surface for mild vibration resistance. The zinc plating provides corrosion resistance in wet environments. Head height includes the flange. Length is measured from under the flange.