Category 1 is the highest attainable anchor category for reliability

5/8-18 x 3 3/4 Grade 5 Hex Cap Screw Plain Domestic USA (100)

7/16-20 L9 Hex Nut Alloy Cadmium Yellow and Wax Coated Domestic USA (50)

8-32 x 3/4 Phillips Flat Undercut Machine Screw Black Zinc Plated (10

1 1/4-12 x 9 Socket Cap Screw Alloy

5/16-18 x 3 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (450) USS Flat Washers Plain Category 1 is the highest5 16 18 x 3 1 2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (450) . 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