Holding power: Pull-out values of Marine screws exceed those of ordinary tapping screws in fiberglass and wood

1 1/8-12 x 4 Socket Cap Screw Alloy

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

Designed to work with all backer boards

5/16-18 x 1 Grade 8 Hex Cap Screw Plain Domestic USA (1400) Reduced Shank Drill Bits - 3/8 Shank Holding power: Pull-out values of5 16 18 x 1 Grade 8 Hex Cap Screw Plain Domestic USA (1400). 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