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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 Screws, Inch Stainless
18-8 (304) Hex UNC Cap Screw
18-8 (18% Chromium, 8% Nickel) the most common grade of stainless steel fastener, also known as 304 and A2 stainless. 1/4"-20 x 1/2" through 1 3/8"-6 x 6".