Width Across Flats:

304 and 305 series stainless steels so 18-8 is used at times to designate any and all of those alloy groups

9/16-12 x 3 3/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (125)

8 x 3/4 Simpson Mod Truss-Head Wire Lath Screws - Phillips Drive 305 SS - Box (100)

1 1/8-7 x 9 A307A Hex Bolt Hot Dipped Galvanized

1 1/4 F436 Structural Flat Washer Plain Domestic USA - Carton (250) 1/2-13 Flat Socket Cap Screws Alloy Width Across Flats:1 1 4 F436 Structural Flat Washer Plain Domestic USA Carton (250) for all your high strength structural bolting needs. These hardened washers meet ASTM F436 specifications, ensuring precise load distribution and preventing embedment under the heads of A325 and A490 bolts. Ideal for interior or sealed structural connections where an uncoated surface is required. Trust Domestic USA quality for reliable, traceable, and superior structural assemblies.