Conform to ASTM F879

3/8 Heavy Duty Jobber Drill Bit

142" (118 mils

Asymmetrical thread pattern resists material slippage during pull out and vibration

3-4 A194 2H Heavy Hex Nut Plain

5/16-18 x 1 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (1000) HeadLOK Heavy Duty Flathead Fasteners Conform to ASTM F8795 16 18 x 1 1 2 Grade 8 Hex Cap Screw Plain Domestic USA (1000). 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