Stainless Steel socket head caps come in A2 and A4 steel, the difference between them is the corrosion resistance, A4 being more resistant to corrosion and most likely used in a marine environment. A2 stainless steel socket head caps are the most popular grade of stainless we supply, frequently used in the food industry, Franciskirk.com stocks one of the largest selections of stainless steel fasteners online including all metric sizes of A2 and A4 cap screws. We're also proud to offer Holo-krome A2 stainless steel socket head cap screws.
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