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 US Inch size 18.8 (304) and 316 Stainless Steel for strength and corrosion resistance.
Home » Hex Cap Screws » Hex Cap Screw, INCH Stainless
18-8 Hex, UNC
18-8 (18% Chromium, 8% Nickel) the most common grade of stainless steel fastener. Outside of the US it is commonly known as A2 stainless.