5/16-24 x 7/8 Grade 5 Hex Cap Screw Plain Domestic USA (100)

Used for drilling holes in hard

9/16-18 x 1 1/2 Socket Set Screw Cup Point Alloy

Pre-drilling recommended near board ends to prevent splitting

1/4-28 x 4 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (50) Fiber-Cement Screws Stainless Steel 5/16-24 x 7/8 Grade 51 4 28 x 4 1 2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (50) . 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