A307A Hex Tap Bolts are manufactured from low carbon steel

#38 Heavy Duty Drill Bit - Stubby Length

The body of the anchors is also corrosion resistant

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

3/16 x 4 Mushroom Spike Zinc Plated (100)

3/4-16 x 3 3/4 Hex Cap Screw SS 18-8 (A2) 7/8-9 Grade 5 Hex Cap Screws Zinc Plated A307A Hex Tap Bolts are3 4 16 x 3 3 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