Hardness requirements of HRB 68 - HRC 32 are met or exceeded

Marine screws bite and hold fast in fiberglass

1-14 x 2 1/2 Grade 5 Hex Cap Screw Zinc Plated

5/8-11 x 10 Simpson Wedge Anchor 303 SS (10)

8" fastener - Double 2x to Single 4x Decking Posts

1/4-20 x 3 1/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (50) Phillips Trim-Head Sharp Point Drywall Screws Black Phosphate Hardness requirements of HRB 681 4 20 x 3 1 4 Grade 8 Hex Cap Screw Yellow Zinc Plated 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