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

1-14 x 3 Grade 8 Hex Cap Screw Yellow Zinc Plated

11/32 Heavy Duty Jobber Drill Bit

(SPM™) SNAPSKRU® Mini Anchor and 6 x 1 1/4 Combo Screw (100)

3/4 x 10 Hex Lag Screw Zinc Plated

7/8-9 x 4 1/4 Hex Cap Screw SS 18-8 (A2) 7/16-14 Hex Tap Bolts 18-8 Stainless Steel Typical hardness on diameters 1/47 8 9 x 4 1 4 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