hardness will range from HRC 31-39

3/8 x 18 ITM SDS Plus Hammer Drill Bit

3/8-16 x 3 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (325)

3/4-10 x 4 1/2 Hex Cap Screw SS 316 (A4)

5/16 x 7 Square Pan GutterScrew® Brown (25)

3/8-16 x 6 Grade 8 Hex Cap Screw Plain Domestic USA (50) Flat Mushroom Toggle Bolts Zinc Plated hardness will range from HRC3 8 16 x 6 Grade 8 Hex Cap Screw Plain Domestic USA (50). 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 to 2