Hot-Dip Galvanized nuts are over tapped per ASTM A563

1/2-13 x 3 A325 Type 1 Heavy Hex Bolt Plain (250)

1/2-20 x 1 1/4 Grade 5 Hex Cap Screw Plain Domestic USA (50)

1/4-28 x 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (3300)

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5/16-24 x 3 1/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (450) Star Flat Decking Screws Yellow Zinc Plated Hot-Dip Galvanized nuts are over5 16 24 x 3 1 4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (450) . 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