{"id":3159,"date":"2025-06-17T09:05:48","date_gmt":"2025-06-17T01:05:48","guid":{"rendered":"https:\/\/machinedwasher.com\/?post_type=product&p=3159"},"modified":"2025-06-17T10:44:27","modified_gmt":"2025-06-17T02:44:27","slug":"double-fold-self-locking-washer","status":"publish","type":"product","link":"https:\/\/machinedwasher.com\/tr\/products\/double-fold-self-locking-washer\/","title":{"rendered":"Double Fold Self Locking Washer DIN25201 Double Stacked Wedge Lock Washer"},"content":{"rendered":"

What is a Double Fold Self Locking Washer?<\/strong><\/h2>\n

A\u00a0Double Fold Self Locking Washer<\/strong>\u00a0is a specialized type of washer designed to prevent loosening of fasteners due to vibration, thermal expansion, or dynamic loads. It features a unique double-folded design that creates spring tension when compressed between a nut and a surface, maintaining constant pressure and resisting rotational movement. Unlike standard washers, its locking mechanism does not rely on adhesives or external locking devices, making it a reliable mechanical solution for securing bolted joints.<\/p>\n

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Materials<\/strong><\/h2>\n

Double fold self locking washers are manufactured from various materials to suit different environmental and mechanical requirements:<\/p>\n

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  • \n

    Carbon Steel (Grade 8, 10, or 12.9)<\/strong>\u00a0\u2013 High strength and durability for heavy-duty applications.<\/p>\n<\/li>\n

  • \n

    Stainless Steel (A2\/AISI 304, A4\/AISI 316)<\/strong>\u00a0\u2013 Corrosion-resistant, ideal for marine, chemical, and food-processing industries.<\/p>\n<\/li>\n

  • \n

    Alloy Steel (4140, 4340)<\/strong>\u00a0\u2013 Heat-treated for enhanced hardness and fatigue resistance.<\/p>\n<\/li>\n

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    Phosphor Bronze (C51000, C52100)<\/strong>\u00a0\u2013 Used in electrical applications due to its conductivity and anti-galling properties.<\/p>\n<\/li>\n

  • \n

    Brass (C36000)<\/strong>\u00a0\u2013 Suitable for low-friction and decorative applications.<\/p>\n<\/li>\n

  • \n

    Titanium (Grade 2, Grade 5)<\/strong>\u00a0\u2013 Lightweight yet strong, used in aerospace and medical devices.<\/p>\n<\/li>\n<\/ul>\n

    \n

    Surface Treatments<\/strong><\/h2>\n

    To enhance performance and longevity, these washers undergo various surface treatments:<\/p>\n

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    • \n

      Zinc Plating (Yellow\/White Zinc)<\/strong>\u00a0\u2013 Provides corrosion resistance and a smooth finish.<\/p>\n<\/li>\n

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      Hot-Dip Galvanizing<\/strong>\u00a0\u2013 Thick zinc coating for extreme environments.<\/p>\n<\/li>\n

    • \n

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

    • \n

      Cadmium Plating<\/strong>\u00a0\u2013 High corrosion resistance (limited use due to environmental concerns).<\/p>\n<\/li>\n

    • \n

      Passivation (for Stainless Steel)<\/strong>\u00a0\u2013 Removes free iron particles to enhance corrosion resistance.<\/p>\n<\/li>\n

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      Nickel Plating<\/strong>\u00a0\u2013 Adds hardness and improves appearance.<\/p>\n<\/li>\n<\/ul>\n

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      Specifications<\/strong><\/h2>\n

      Double fold self locking washers come in a range of sizes and dimensions:<\/p>\n

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      • \n

        Inner Diameter (ID):<\/strong>\u00a0M3 to M36 (metric) or #4 to 1.5″ (imperial).<\/p>\n<\/li>\n

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        Outer Diameter (OD):<\/strong>\u00a0Varies based on application requirements.<\/p>\n<\/li>\n

      • \n

        Thickness:<\/strong>\u00a0Typically 0.5mm to 3mm, depending on material and load capacity.<\/p>\n<\/li>\n

      • \n

        Locking Torque:<\/strong>\u00a0Varies with material and design, usually between 5 Nm to 150 Nm.<\/p>\n<\/li>\n

      • \n

        Standards:<\/strong>\u00a0Compliant with DIN 6796, ISO 8750, and NASM 35338.<\/p>\n<\/li>\n<\/ul>\n

        \n

        Applications<\/strong><\/h2>\n

        These washers are widely used in industries where vibration resistance is critical:<\/p>\n

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        • \n

          Automotive & Aerospace:<\/strong>\u00a0Engine mounts, landing gear, and transmission systems.<\/p>\n<\/li>\n

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          Industrial Machinery:<\/strong>\u00a0Pumps, compressors, and heavy equipment.<\/p>\n<\/li>\n

        • \n

          Rail & Marine:<\/strong>\u00a0Bolted joints in rail tracks and shipbuilding.<\/p>\n<\/li>\n

        • \n

          Energy Sector:<\/strong>\u00a0Wind turbines, oil rigs, and power generation systems.<\/p>\n<\/li>\n

        • \n

          Electronics & Appliances:<\/strong>\u00a0Securing components in high-vibration environments.<\/p>\n<\/li>\n

        • \n

          Construction & Infrastructure:<\/strong>\u00a0Bridges, steel frameworks, and seismic-resistant structures.<\/p>\n<\/li>\n<\/ul>\n

          \n

          Excellent Case: Wind Turbine Blade Assembly<\/strong><\/h2>\n

          Challenge:<\/strong><\/h3>\n

          A leading wind turbine manufacturer faced persistent bolt loosening in rotor blade connections due to extreme wind-induced vibrations. Traditional locking methods (nylon inserts, thread lockers) failed under prolonged stress, leading to maintenance downtime and safety risks.<\/p>\n

          Solution:<\/strong><\/h3>\n

          The company switched to\u00a0double fold self-locking washers (AISI 316 stainless steel, hot-dip galvanized)<\/strong>\u00a0for all critical blade-hub fasteners. The washers provided:<\/p>\n

            \n
          • \n

            Persistent Spring Action:<\/strong>\u00a0Maintained clamping force despite cyclic loads.<\/p>\n<\/li>\n

          • \n

            Corrosion Resistance:<\/strong>\u00a0Withstood harsh offshore conditions.<\/p>\n<\/li>\n

          • \n

            No Chemical Degradation:<\/strong>\u00a0Unlike thread lockers, they didn\u2019t degrade under UV exposure.<\/p>\n<\/li>\n<\/ul>\n

            Results:<\/strong><\/h3>\n
              \n
            • \n

              Zero Bolt Failures<\/strong>\u00a0over a 5-year period.<\/p>\n<\/li>\n

            • \n

              50% Reduction in Maintenance Costs<\/strong>\u00a0due to fewer retightening requirements.<\/p>\n<\/li>\n

            • \n

              Increased Turbine Uptime<\/strong>\u00a0by eliminating unscheduled repairs.<\/p>\n<\/li>\n<\/ul>\n

              This case demonstrates how double fold self locking washers provide long-term reliability in high-stress, high-vibration applications.<\/p>\n

              \n

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

              The\u00a0double fold self locking washer<\/strong>\u00a0is an essential fastener for industries where vibration resistance is paramount. With diverse material options, surface treatments, and proven effectiveness in critical applications, it ensures secure, maintenance-free bolted joints. Whether in aerospace, energy, or heavy machinery, this washer delivers unmatched performance where traditional methods fall short.<\/p>","protected":false},"excerpt":{"rendered":"

              Double Fold Self Locking Washer DIN25201 Double Stacked Wedge Lock Washer<\/p>","protected":false},"featured_media":3161,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[36],"product_tag":[821,800,824,866,861,862,863,865,869,870,867,868,864],"class_list":{"0":"post-3159","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-machined-washer","7":"product_tag-cnc-machined-washer","8":"product_tag-cnc-machined-washers","9":"product_tag-custom-washer","10":"product_tag-self-lock-washer","11":"product_tag-self-locking-washer","12":"product_tag-self-locking-washers","13":"product_tag-wedge-lock-washer","14":"product_tag-wedge-lock-washer-din-25201","15":"product_tag-wedge-lock-washer-m10","16":"product_tag-wedge-lock-washer-m16","17":"product_tag-wedge-lock-washer-m24","18":"product_tag-wedge-lock-washer-m8","19":"product_tag-wedge-washer","21":"first","22":"instock","23":"shipping-taxable","24":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product\/3159","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/comments?post=3159"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/media\/3161"}],"wp:attachment":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/media?parent=3159"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product_brand?post=3159"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product_cat?post=3159"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product_tag?post=3159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}