{"id":3415,"date":"2025-06-24T15:07:41","date_gmt":"2025-06-24T07:07:41","guid":{"rendered":"https:\/\/machinedwasher.com\/?post_type=product&p=3415"},"modified":"2025-06-24T15:12:23","modified_gmt":"2025-06-24T07:12:23","slug":"external-tooth-lock-washer","status":"publish","type":"product","link":"https:\/\/machinedwasher.com\/hi\/products\/external-tooth-lock-washer\/","title":{"rendered":"DIN6797 Stainless Steel External Tooth Lock Washer M6 M20 with Serrated Design"},"content":{"rendered":"

What is an External Tooth Lock Washer?<\/strong><\/h3>\n

An\u00a0External Tooth Lock Washer<\/strong>\u00a0is a specialized fastener with outward-facing serrated teeth around its outer edge. When compressed between a nut\/bolt head and the mating surface, these teeth\u00a0bite into both materials<\/strong>, creating strong frictional resistance to prevent loosening from vibration, shock, or thermal cycling.<\/p>\n

\n

Specifications of External Tooth Lock Washer<\/strong><\/h3>\n

1. Material<\/strong><\/h4>\n
    \n
  • \n

    Carbon Steel (Grade 65Mn\/1074)<\/strong>\u00a0\u2013 High strength for general industrial use.<\/p>\n<\/li>\n

  • \n

    Stainless Steel (AISI 304\/316)<\/strong>\u00a0\u2013 Corrosion-resistant for marine\/chemical environments.<\/p>\n<\/li>\n

  • \n

    Phosphor Bronze (C51000)<\/strong>\u00a0\u2013 Conductive and non-magnetic for electronics.<\/p>\n<\/li>\n

  • \n

    Titanium<\/strong>\u00a0\u2013 Lightweight and extreme corrosion resistance (aerospace).<\/p>\n<\/li>\n<\/ul>\n

    2. Surface Treatment<\/strong><\/h4>\n
      \n
    • \n

      Zinc Plating (Blue\/White\/Yellow)<\/strong>\u00a0\u2013 Economical rust protection.<\/p>\n<\/li>\n

    • \n

      Black Oxide<\/strong>\u00a0\u2013 Anti-galling and mild corrosion resistance.<\/p>\n<\/li>\n

    • \n

      Dacromet Coating<\/strong>\u00a0\u2013 Superior corrosion protection for automotive.<\/p>\n<\/li>\n

    • \n

      Nickel Plating<\/strong>\u00a0\u2013 For high-temperature or chemical exposure.<\/p>\n<\/li>\n<\/ul>\n

      3. Common Sizes & Standards<\/strong><\/h4>\n
        \n
      • \n

        Inner Diameter (ID)<\/strong>: #2 to 1.5″ (imperial) or M2 to M36 (metric).<\/p>\n<\/li>\n

      • \n

        Outer Diameter (OD)<\/strong>: 1.8\u20132.5x the bolt size (e.g., M6 washer \u2248 12mm OD).<\/p>\n<\/li>\n

      • \n

        Tooth Count<\/strong>: 8\u201316 teeth (optimized for load distribution).<\/p>\n<\/li>\n

      • \n

        Thickness<\/strong>: 0.8mm to 3mm (heavy-duty versions available).<\/p>\n<\/li>\n

      • \n

        Standards<\/strong>: DIN 6798, SAE J156, ISO 7080.<\/p>\n<\/li>\n<\/ul>\n

        \n

        Applications of External Tooth Lock Washers<\/strong><\/h3>\n
          \n
        • \n

          Automotive<\/strong>: Wheel hubs, suspension linkages, and turbocharger assemblies.<\/p>\n<\/li>\n

        • \n

          Aerospace<\/strong>: Engine mounts and flight control systems.<\/p>\n<\/li>\n

        • \n

          Heavy Machinery<\/strong>: Excavator track bolts, crusher jaw plates.<\/p>\n<\/li>\n

        • \n

          Energy Sector<\/strong>: Wind turbine blade bolts, solar racking systems.<\/p>\n<\/li>\n

        • \n

          Electronics<\/strong>: Server racks, transformer busbars.<\/p>\n<\/li>\n<\/ul>\n

          \n

          Excellent Case: Securing Wind Turbine Blade Bolts<\/strong><\/h3>\n

          Scenario<\/strong><\/h4>\n

          A wind farm experiences frequent bolt loosening in\u00a0blade root joints<\/strong>\u00a0due to:<\/p>\n

            \n
          • \n

            Extreme vibration (from wind gusts + rotor dynamics).<\/p>\n<\/li>\n

          • \n

            Thermal cycling (-30\u00b0C to +60\u00b0C).<\/p>\n<\/li>\n

          • \n

            Composite material “creep” (fiberglass hub).<\/p>\n<\/li>\n<\/ul>\n

            Solution<\/strong><\/h4>\n
              \n
            1. \n

              Washer Selection<\/strong>:<\/p>\n

                \n
              • \n

                Material<\/strong>:\u00a0AISI 316 Stainless Steel<\/strong>\u00a0(resists saltwater corrosion).<\/p>\n<\/li>\n

              • \n

                Size<\/strong>: M24 external tooth washer (ID 24mm, OD 45mm, 12 teeth).<\/p>\n<\/li>\n

              • \n

                Coating<\/strong>:\u00a0Dacromet<\/strong>\u00a0for long-term weather resistance.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

              • \n

                Installation<\/strong>:<\/p>\n

                  \n
                • \n

                  Teeth grip the\u00a0steel bolt head<\/strong>\u00a0and\u00a0fiberglass hub surface<\/strong>.<\/p>\n<\/li>\n

                • \n

                  Combined with\u00a0thread-locking adhesive<\/strong>\u00a0for redundant security.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                  Results<\/strong><\/h4>\n
                    \n
                  • \n

                    Zero Loosening Events<\/strong>: After 5 years of operation (vs. quarterly retorquing previously).<\/p>\n<\/li>\n

                  • \n

                    Prevents Micro-Movement<\/strong>: Teeth eliminate fretting corrosion at the joint.<\/p>\n<\/li>\n

                  • \n

                    Cost Savings<\/strong>: $200k\/year reduced maintenance per turbine.<\/p>\n<\/li>\n<\/ul>\n

                    Why It Outperforms Alternatives<\/strong><\/h4>\n
                      \n
                    • \n

                      Distributes Load<\/strong>: Teeth prevent localized stress on composites.<\/p>\n<\/li>\n

                    • \n

                      Works with Soft Materials<\/strong>: Unlike split washers, won\u2019t damage fiberglass.<\/p>\n<\/li>\n

                    • \n

                      Temperature Resistant<\/strong>: Performs across extreme thermal ranges.\"\"<\/p>\n<\/li>\n<\/ul>\n

                      \n

                      Conclusion<\/strong><\/h3>\n

                      External tooth lock washers excel in\u00a0high-load, high-vibration environments<\/strong>\u00a0where material mismatch (e.g., steel bolt + composite) demands secure, long-term fastening. The wind turbine case proves their reliability in\u00a0critical renewable energy infrastructure<\/strong>.<\/p>","protected":false},"excerpt":{"rendered":"

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