Stainless Countersunk socket screw – Grade A4
- Grade A4 – 316 Stainless steel
- DIN 7991
Grade A4 or 316 stainless steel is used for fasteners requiring higher levels of corrosion resistance and is often referred to as marine grade or acid proof. It has higher resistance to aggressive environments such as seawater and industrial pollution and maintains a pristine finish when used in external applications making it ideal for architectural use.