Hex screw hot-dip galvanized 8.8 are ideal for strong and corrosion-resistant fastening solutions. The strength class 8.8 ensures good strength with a minimum tensile strength of 800 MPa. The hot-dip galvanizing according to ISO 10684 gives long-lasting protection against rust with a minimum 45 µm zinc coating. The standards DIN 931, DIN 933, ISO 4014 and ISO 4017 ensure accurate dimensions and reliable performance. Perfect for use in construction, machinery and industrial applications, including structures that require documented corrosion protection according to NS-EN 1090. Strength class 8.8 is the standard choice for HDG structural fasteners because the combination balances load capacity and coating compatibility without the hydrogen embrittlement risk that exists for class 10.9 with HDG coating. The coefficient of friction for HDG against HDG is typically 0.18 to 0.22. Torque values are calculated separately from dry, uncoated connections. Always use over-tapped HDG nuts of the ISOFIT type if it is to be used with an ISOFIT hex screw. Specification Standard: DIN 931 / ISO 4014 (partially threaded) and DIN 933 / ISO 4017 (fully threaded) Strength class: 8.8, min. tensile strength 800 MPa, yield strength 640 MPa Surface treatment: Hot-dip galvanized (HDG) according to ISO 10684, min. 45 µm Corrosion protection: Typically 5 or more years in an exposed outdoor environment Coefficient of friction: 0.18 to 0.22 for HDG against HDG, adjust torque values Nut: Requires over-tapped HDG nuts, ISOFIT Key properties Hex screw hot-dip galvanized 8.8 DIN 931/933 is the standard specification for outdoor structural fasteners where an HDG ISO 10684 coating is required. Strength class 8.8 is safer than 10.9 with HDG because the hydrogen embrittlement risk is significantly lower. ISO 10684 minimum 45 µm zinc coating gives long-lasting corrosion protection for exposed structures without periodic maintenance. Always use over-tapped HDG nuts of the ISOFIT type. Standard nuts do not have sufficient clearance for the coating thickness.