Conform to ASTM F837

7/8-14 x 4 Grade 8 Hex Cap Screw Yellow Zinc Plated

7/8-9 x 3 Hex Cap Screw SS 18-8 (A2)

3 USS Flat Washer Zinc Plated

9/16-18 x 3 Hex Cap Screw SS 18-8 (A2) 3/4-10 Flat Socket Cap Screws Alloy Conform to ASTM F8379 16 18 x 3 Hex Cap Screw SS 18 8 (A2) . 18 8 stainless steel hex cap screws will have a typical composition of 18% chromium and 8% nickel. These percentages exist in 303, 304 and 305 series stainless steels so 18 8 is used at times to designate any and all of those alloy groups. 18 8 stainless steel offers good corrosion resistance and machines easily but will over time stain in coastal environments. They are also acceptable for use in ACQ pressure