What's the difference between 304 (A2) and 316 (A4) stainless steel?

304 is standard grade stainless steel, 316 is marine grade. For decking screws if you are within 1km of the coast you should consider using marine grade decking screws. 304 or A2 stainless steel is STANDARD GRADE and typically comprises 17-20% chromium and 8-13% nickel and fasteners manufactured from this material show excellent resistence to corrosion in all but the harshest environments.

316 grade stainless steel, also known as MARINE or A4 grade, comprises 16-18.5% chromium and 10-14% nickel but also includes 2-3% of the element Molybdenum, which provides increased resistance to chloride corrosion (e.g. Corrosion in salt water environments). Molybdenum also minimises metallic contamination making 316 stainless very suitable for food and pharmaceutical processing environments. 316 fasteners are commonly used on boats, and in any coastal environment where the fastener may come into regular contact with salt water, spray or mist.

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