Hardness: Rockwell hardness ranges from B68 to C32

#3 square drive

When you need TimberLOK® Heavy Duty Wood Screws

Eliminates jarring and damage caused by a sledgehammer

7 x 1 5/8 Simpson Trim-Head Wood Decking Screws - Square Drive 316 SS - Bulk Pail (1750)

9/16-12 x 4 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (100) 1/2-20 Grade 8 Hex Cap Screws Yellow Zinc Plated - Domestic USA Hardness: Rockwell hardness ranges from9 16 12 x 4 1 2 Grade 8 Hex Cap Screw Plain Domestic USA (100). 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