GRADE HEAVY HEX NUT ASTM A194 GRADE 2H / 2HM, GRADE 4, GRADE 7 / 7M, GRADE 8 / 8M SURFACE TREATMENT Hot-Dipped Galvanized (HDG), Cadmium, Zinc Nickel, Xylar 2, Xylan 1070, Xylan 1424, Fluorocarbon Coated (FCC) / PTFE