Description Blue PTFE Coated 2H Heavy Hex NutsHigh-strength ASTM A194 Grade 2H heavy hex nuts with a blue PTFE coating for enhanced corrosion resistance and reduced friction. Designed for use with compatible B7 or other high-strength bolting in flange and industrial applications, these nuts provide reliable load retention, chemical resistance, and consistent performance in demanding environments such as petrochemical, refining, and general industrial service.