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What is the difference between Stainless steel A2 and A4

Stainless A2 (304) vs A4 (316): When Marine Grade Matters

Difference between A2 and A4 stainless

A practical guide to A2 (304) vs A4 (316) stainless steel fasteners—what the grades mean, when “marine grade” matters, galvanic pairing tips for coastal use, and how to choose the right hardware for long-term corrosion resistance.