Designed to work with ACQ treated lumber

1/4-20 x 1 1/4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100)

9/16-12 x 6 Grade 8 Hex Cap Screw Plain Domestic USA (75)

1/2 x 6 1/2 Mushroom Spike Zinc Plated (25)

These are fully threaded hex cap screws (i

1/4-28 x 1 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (1600) Simpson Square Trim-Head Wood Decking Screws 305 Stainless Steel Designed to work with ACQ1 4 28 x 1 1 2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (1600) . Grade 5 Hex Cap Screws are manufactured in the USA from medium carbon steel. Our Grade 5 material meets or exceeds SAE J429 Grade 5 specifications. All products are manufactured with rolled threads. Typical hardness on diameters 1 4 to 1 inch is HRC 25 34. On diameters over 1 inch to 1 1 2 hardness will range from HRC 19 30. Tensile strength for diameters 1 4 to 1 inch is a minimum