All hex cap screws are tested to meet ASTM F606 standards for hardness

3/4-10 x 1 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25)

5/16-18 x 6 Grade 8 Hex Cap Screw Plain Domestic USA (250)

9/16-12 x 6 Hex Cap Screw SS 18-8 (A2)

3/4-16 x 3 3/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) M10-1.5 Hex Cap Screws 8.8 DIN 931 Zinc Plated All hex cap screws are3 4 16 x 3 3 4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) . 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