even in pressure treated wood

1/4-20 x 1 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (1600)

When removed

1 1/8 L9 SAE Tension Flatwasher Yellow Zinc Plated Domestic USA (340)

5/16-24 x 2 3/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (100) 12" Aircraft Bits Cobalt - Fractional even in pressure treated wood5 16 24 x 2 3 4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (100) . 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