Hardness for plain and zinc plated washers is HRC 38-45 and HRC 26-45 for hot-dip galvanized washers per ASTM F436

7 x 2 1/2 Simpson Trim-Head Wood Decking Screws - Square Drive 305 SS - 1 lbs Pack (126)

1 1/8 x 36 ITM SDS Max X-Cutter Hammer Drill Bit

Designed for use in standard bolting applications where corrosion is of concern

1/2-13 x 7 Socket Cap Screw 18-8 (A2) Stainless Steel

1/4-28 x 2 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (100) Square Pancake-Head Self Drilling Screws 410 Stainless Steel Hardness for plain and zinc1 4 28 x 2 1 2 Grade 8 Hex Cap Screw Yellow Zinc Plated 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