{"id":3411,"date":"2025-06-24T14:43:29","date_gmt":"2025-06-24T06:43:29","guid":{"rendered":"https:\/\/machinedwasher.com\/?post_type=product&p=3411"},"modified":"2025-06-24T14:49:07","modified_gmt":"2025-06-24T06:49:07","slug":"internal-tooth-lock-washer","status":"publish","type":"product","link":"https:\/\/machinedwasher.com\/pt\/products\/internal-tooth-lock-washer\/","title":{"rendered":"Internal Tooth Lock Washer SS304 Stainless Steel Tooth Lock Washer"},"content":{"rendered":"

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

An\u00a0Internal Tooth Lock Washer<\/strong>\u00a0is a type of locking washer designed with serrated teeth bent inward toward the center hole. When compressed under a nut or bolt head, the teeth dig into the mating surface and the fastener, creating\u00a0friction and mechanical resistance<\/strong>\u00a0to prevent loosening caused by vibration or thermal cycling.<\/p>\n

\n

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

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

    Carbon Steel (Grade 65Mn\/1074)<\/strong>\u00a0\u2013 Standard for general applications.<\/p>\n<\/li>\n

  • \n

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

  • \n

    Phosphor Bronze (C51000)<\/strong>\u00a0\u2013 Used in electrical applications for conductivity.<\/p>\n<\/li>\n

  • \n

    Beryllium Copper<\/strong>\u00a0\u2013 Non-sparking and high fatigue resistance.<\/p>\n<\/li>\n<\/ul>\n

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

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

    • \n

      Black Oxide<\/strong>\u00a0\u2013 Improves wear resistance and reduces glare.<\/p>\n<\/li>\n

    • \n

      Passivation (Stainless Steel)<\/strong>\u00a0\u2013 Enhances corrosion resistance.<\/p>\n<\/li>\n

    • \n

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

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

        Inner Diameter (ID)<\/strong>: #4 to 1″ (imperial) or M3 to M24 (metric).<\/p>\n<\/li>\n

      • \n

        Outer Diameter (OD)<\/strong>: Typically 1.5\u20132x the bolt size.<\/p>\n<\/li>\n

      • \n

        Tooth Count<\/strong>: 6\u201312 teeth (varies by size).<\/p>\n<\/li>\n

      • \n

        Thickness<\/strong>: 0.5mm to 2.5mm.<\/p>\n<\/li>\n

      • \n

        Standards<\/strong>: DIN 6797, NASM 35338, or custom designs.<\/p>\n<\/li>\n<\/ul>\n

        \n

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

          Automotive<\/strong>: Engine components, brake systems, and exhaust mounts.<\/p>\n<\/li>\n

        • \n

          Electronics<\/strong>: Securing terminal blocks, PCB standoffs, and heat sinks.<\/p>\n<\/li>\n

        • \n

          Aerospace<\/strong>: Avionics and vibration-prone assemblies.<\/p>\n<\/li>\n

        • \n

          Industrial Machinery<\/strong>: Pumps, motors, and conveyor systems.<\/p>\n<\/li>\n

        • \n

          HVAC & Plumbing<\/strong>: Pipe flanges and refrigerant line fittings.<\/p>\n<\/li>\n<\/ul>\n

          \n

          Excellent Case: Securing High-Vibration Industrial Fan Blades<\/strong><\/h3>\n

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

          A manufacturer of industrial exhaust fans faces recurring failures due to blade-attachment bolts loosening from constant vibration, leading to imbalance and catastrophic blade detachment.<\/p>\n

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

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

              \n
            • \n

              Material<\/strong>:\u00a0Stainless Steel AISI 316<\/strong>\u00a0(resists humid\/chemical exposure).<\/p>\n<\/li>\n

            • \n

              Size<\/strong>: M10 internal tooth washer (ID 10mm, OD 20mm, 8 teeth).<\/p>\n<\/li>\n

            • \n

              Surface Treatment<\/strong>:\u00a0Passivated<\/strong>\u00a0to prevent galvanic corrosion.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

            • \n

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

                \n
              • \n

                Placed under the nut of each fan blade bolt.<\/p>\n<\/li>\n

              • \n

                Teeth bite into both the\u00a0blade hub (aluminum)<\/strong>\u00a0and\u00a0nut (steel)<\/strong>, creating a\u00a0mechanical lock<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

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

                  Eliminates Bolt Loosening<\/strong>: Teeth maintain grip even under 10,000 RPM vibrations.<\/p>\n<\/li>\n

                • \n

                  Extends Maintenance Intervals<\/strong>: No retorquing required for over 2 years of operation.<\/p>\n<\/li>\n

                • \n

                  Prevents Costly Failures<\/strong>: Zero incidents of blade detachment post-implementation.<\/p>\n<\/li>\n<\/ul>\n

                  Why It\u2019s Superior to Alternatives<\/strong><\/h4>\n
                    \n
                  • \n

                    Space-Efficient<\/strong>: Thinner than split or helical lock washers.<\/p>\n<\/li>\n

                  • \n

                    Positive Locking<\/strong>: Teeth provide\u00a0mechanical resistance<\/strong>\u00a0(unlike friction-only flat washers).<\/p>\n<\/li>\n

                  • \n

                    Material Versatility<\/strong>: Works with soft (aluminum) or hard (steel) surfaces.<\/p>\n<\/li>\n<\/ul>\n

                    \n

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

                    Internal tooth lock washers are ideal for\u00a0high-vibration, high-load, or safety-critical applications<\/strong>\u00a0where traditional washers fail. The industrial fan case demonstrates their\u00a0durability, simplicity, and cost-effectiveness<\/strong>\u00a0in preventing catastrophic failures.<\/p>","protected":false},"excerpt":{"rendered":"

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