A2-70 is a standard strength class for A2 stainless fasteners. A2-80 has higher tensile strength and is used when the project specification requires greater fastening strength.

A2 is the metric fastener designation commonly used for 304 stainless steel. In many fastener applications, A2 and 304 refer to similar stainless steel material performance.

A2 stainless steel is an austenitic stainless steel grade commonly associated with 304 stainless steel. It provides good corrosion resistance for many indoor, outdoor, and industrial uses.