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1/4-28 x 3/8 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (3300) 1/2-13 A325 Type 1 Heavy Hex Bolts Hot Dipped Galvanized 1-14 x 3 1/4 Grade1 4 28 x 3 8 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (3300) . 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