Grade 5 Hex Cap Screws are manufactured from medium carbon steel

3/4-10 x 2 3/4 Hex Cap Screw SS 18-8 (A2)

1-14 x 5 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated

3/4-16 x 4 Grade 8 Hex Cap Screw Yellow Zinc Plated

5/8-11 x 4 Hex Cap Screw SS 316 (A4)

5/8-11 x 6 Hex Cap Screw SS 18-8 (A2) 3/4-10 Hex Cap Screws 18-8 Stainless Steel Grade 5 Hex Cap Screws5 8 11 x 6 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