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Glossary
A2 Stainless Steel
Class A2 stainless steel is a metric fastener designation defined under ISO standards and commonly associated with austenitic stainless steel similar to Grade 304. It contains chromium and nickel and offers good corrosion resistance in many indoor and outdoor environments.
Class A2 stainless steel fasteners perform well in applications exposed to moisture and mild chemicals but do not contain molybdenum, making them less resistant to chlorides and saltwater than Class A4 stainless steel. They are widely used for general-purpose fastener applications where moderate corrosion resistance is required.