Metric Hex Flange Nuts, Serrated, Zinc Plated Class 10.9 Steel, M8 x 1.25
Class 10.9 Metric Sized Serrated Hex Flange Nuts
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Metric Serrated Hex Flange Nuts in Class 10.9 Zinc Plated Steel (also known as Serrated Flange Lock Nuts, Toothed Flange Nuts, or Grip Lock Flange Nuts) feature an integrated washer flange with serrated teeth on the bearing surface that bite into the mating material during installation. As the nut is tightened, the serrations dig into the workpiece, creating mechanical resistance to rotation that prevents loosening caused by vibration, shock, and dynamic loads—without requiring additional lock washers or thread locker compounds. The integrated flange distributes clamping force over a wider area while the serrations provide aggressive grip for reliable locking action. Manufactured from high-strength Class 10.9 alloy steel with a zinc plated finish for corrosion resistance, these serrated flange nuts deliver approximately 25% greater tensile strength than Class 8.8—making them the preferred choice for heavy-duty automotive, machinery, structural, and industrial applications where maximum clamping force and vibration resistance are critical.