Hexagon Flange Bolts with Serrated Flange, made from robust steel material with a resilient zinc plating surface treatment. These Class 8.8 flange bolts feature a hexagon head for optimal driving features. The right-thread direction and metric thread ensure a secure fit for a range of applications. The serrated flange design spreads built-up forces, reducing surface pressure, and provides excellent self-locking properties. Perfect for covering large or oversized holes without the need for washers, these bolts adhere to international standards including ASME ≈B18.2.3.4M, DIN ≈6921, ISO ≈4162 and EN ≈1665.