The Spike® anchor is formed with an "s" shaped configuration at the working end of the anchor to create an expansion mechanism

7/16-14 x 3 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (50)

1 3/4-5 x 4 Socket Cap Screw Alloy

1/2-20 x 2 1/2 Grade 5 Hex Cap Screw Plain Domestic USA (225)

7/8-9 x 3 Grade 5 Hex Cap Screw Plain Domestic USA (55)

1/2-20 x 4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25) 1/2-20 L9 Hex Cap Screws Yellow Zinc Plated - Domestic USA The Spike® anchor is formed1 2 20 x 4 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