Nuts are made from a low-carbon steel which conforms to the following chemical composition requirements: Carbon-0

000 psi is required

2-4 1/2 x 9 Socket Cap Screw Alloy

1-12 x 5 Socket Cap Screw Alloy

1/2-20 x 8 Hex Cap Screw SS 18-8 (A2) Lipped Drop-In Anchors Zinc Plated Nuts are made from a1 2 20 x 8 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