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5/16-18 x 1 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (1400) M24-3.00 Hex Cap Screws DIN 933 18-8 Stainless Steel (A2) 5/8-11 x 8 Grade 55 16 18 x 1 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (1400) . Grade 8 Hex Cap Screws are manufactured in the USA from medium carbon alloy steel. In diameters 1 4 to 1 1 2 inches our Grade 8 material meets or exceeds SAE J429 Grade 8 specifications. Diameters over 1 1 2 inches meet or exceed ASTM A354 Grade BD. All material is manufactured with rolled threads. Yellow zinc plated bolting will meet or exceed ASTM F1941. Typical hardness on