Typical hardness on diameters 1/4 to 2 1/2 inches is HRC 33-39

3/8-16 Drop-In Anchor Zinc Plated (50)

1/2-13 x 4 1/4 Simpson Wedge Anchor 316 SS (25)

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8 x 1 1/4 Star Flat Decking Screws w/ Nibs W

3/8-16 x 2 3/4 Grade 8 Hex Cap Screw Plain Domestic USA (100) 6" Aircraft Bits - Fractional Typical hardness on diameters 1/43 8 16 x 2 3 4 Grade 8 Hex Cap Screw Plain 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 on diameters 1 4