Typical hardness on diameters 1/4 to 2 1/2 inches is HRC 33-39

Tensile strength for diameters 1/4 to 1 inch is a minimum of 120

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

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

5/8-11 x 10 Grade 5 Hex Cap Screw Zinc Plated

7/16-14 x 1 1/2 Hex Tap Bolt 18-8 (A2) Stainless Steel 5/8-11 Hex Cap Screws 316 Stainless Steel Typical hardness on diameters 1/47 16 14 x 1 1 2 Hex Tap Bolt 18 8 (A2) Stainless Steel . 18 8 stainless steel hex tap bolts 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