Toothed Flange Nuts

Toothed flange nuts are high-performance anti-loosening fasteners. They feature a standard hex body integrated with a flange whose underside is machined with radial serrations. Their core advantage is the combination of serrations that prevent slipping and loosening with a wide flange that distributes pressure evenly, resulting in exceptional vibration resistance. Produced to ISO 1661 standards, the fine serrations on the flange bottom are typically 0.2–0.3 mm deep. These teeth bite into the mating surface upon tightening, creating a mechanical engagement that improves anti-loosening performance by over 60% compared to standard flange nuts. The one-piece construction ensures a secure connection, and the 6H internal thread provides precise engagement. Toothed flange nuts are the definitive solution for high-vibration, loosening-prone applications.

Product is essential in automotive engines and transmissions, construction machinery, agricultural equipment, wind power installations, and rail transport - industries characterized by high vibration. In automotive engines, they pair with flange bolts to secure cylinder heads and oil pans, tolerating high-temperature vibrations to maintain critical seals. In construction machinery such as excavators, they withstand vibration shocks under harsh operating conditions. For wind power equipment, they secure turbine blades and hubs against strong wind-induced vibrations. In rail transport, they meet stringent safety standards for carriage components. Toothed flange nuts are key components wherever reliability under dynamic stress is non-negotiable.

These nuts are made from alloy steels 40Cr/35CrMo or stainless steel 316. Alloy steels are heat-treated to achieve strength grades of 8.8 or 10.9, with 10.9 grade offering HRC 32–36 hardness and ≥1000 MPa tensile strength. Stainless steel 316 provides excellent corrosion and high-temperature resistance. Surface treatments include black oxide (GB/T 15519), zinc plating (ASTM B633), and Dacromet coating (DIN 50961), delivering 120–144 hours of salt spray resistance. product are ISO 9001 certified and comply with the automotive IATF 16949 standard. Customization is available for different serration patterns, oversized diameters (M27–M36), increased thickness, and specialized surface treatments such as cadmium or titanium plating. Supplied in packs of 100–200 pieces per sealed package, with anti-loosening performance test reports, they ensure reliable performance in the most demanding applications.