Over-sized threads are wider than gutter spikes

also known as “butterfly anchors

1/4-28 x 4 1/2 Grade 5 Hex Cap Screw Plain Domestic USA (50)

1 9/32 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

9/16-18 x 1 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25) M16-2.00 Socket Cap Screws DIN 912 18-8 Stainless Steel (A2) Over-sized threads are wider than9 16 18 x 1 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25) . 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 of