{"id":3584,"date":"2025-07-04T11:13:04","date_gmt":"2025-07-04T03:13:04","guid":{"rendered":"https:\/\/machinedwasher.com\/?post_type=product&p=3584"},"modified":"2025-07-04T11:17:02","modified_gmt":"2025-07-04T03:17:02","slug":"cup-washers","status":"publish","type":"product","link":"https:\/\/machinedwasher.com\/hi\/products\/cup-washers\/","title":{"rendered":"Customisable Cup Washers Galvanized Carbon Steel Cup Washer for Screw and Nut"},"content":{"rendered":"

What Are Cup Washers?<\/strong><\/h3>\n

Cup washers<\/strong>\u00a0(also called\u00a0dome washers<\/strong>\u00a0or\u00a0curved washers<\/strong>) are specialized washers with a concave or cup-shaped design. They are used to distribute load, prevent fastener pull-through, and provide a smooth bearing surface in applications where a flat washer would not suffice. Their curved shape helps maintain tension and reduces stress on soft or fragile materials.<\/p>\n

\n

Materials of Cup Washers<\/strong><\/h3>\n
    \n
  1. \n

    Steel<\/strong>\u00a0(Carbon steel, Stainless steel) \u2013 High strength, corrosion-resistant (stainless steel preferred for outdoor use).<\/p>\n<\/li>\n

  2. \n

    Aluminum<\/strong>\u00a0\u2013 Lightweight, corrosion-resistant, used in aerospace and electronics.<\/p>\n<\/li>\n

  3. \n

    Brass<\/strong>\u00a0\u2013 Corrosion-resistant, non-sparking, used in electrical and marine applications.<\/p>\n<\/li>\n

  4. \n

    Nylon\/Plastic<\/strong>\u00a0\u2013 Insulating, lightweight, used in electronics and non-conductive applications.<\/p>\n<\/li>\n<\/ol>\n

    \n

    Surface Treatments<\/strong><\/h3>\n
      \n
    1. \n

      Zinc Plating<\/strong>\u00a0\u2013 Common for steel washers, improves corrosion resistance.<\/p>\n<\/li>\n

    2. \n

      Galvanization<\/strong>\u00a0\u2013 Extra corrosion protection for harsh environments.<\/p>\n<\/li>\n

    3. \n

      Anodizing<\/strong>\u00a0(for aluminum) \u2013 Enhances durability and appearance.<\/p>\n<\/li>\n

    4. \n

      Passivation<\/strong>\u00a0(for stainless steel) \u2013 Removes surface contaminants, improves rust resistance.<\/p>\n<\/li>\n

    5. \n

      Powder Coating<\/strong>\u00a0\u2013 Adds color and extra protection (used in architectural applications).<\/p>\n<\/li>\n<\/ol>\n

      \n

      Specifications<\/strong><\/h3>\n
        \n
      • \n

        Inner Diameter (ID):<\/strong>\u00a0Matches bolt size (e.g., M4, M6, 1\/4″, 3\/8″).<\/p>\n<\/li>\n

      • \n

        Outer Diameter (OD):<\/strong>\u00a0Typically 1.5x to 3x the bolt diameter.<\/p>\n<\/li>\n

      • \n

        Thickness:<\/strong>\u00a0Varies (e.g., 1mm to 5mm).<\/p>\n<\/li>\n

      • \n

        Shape:<\/strong>\u00a0Concave (cup depth varies for different load distributions).<\/p>\n<\/li>\n<\/ul>\n

        \n

        Applications<\/strong><\/h3>\n
          \n
        • \n

          Construction:<\/strong>\u00a0Roofing, cladding, and metal framing to prevent fastener pull-through.<\/p>\n<\/li>\n

        • \n

          Automotive:<\/strong>\u00a0Securing upholstery, trim panels, and wiring harnesses.<\/p>\n<\/li>\n

        • \n

          Electronics:<\/strong>\u00a0Protecting PCB mounts and insulating connections.<\/p>\n<\/li>\n

        • \n

          Furniture:<\/strong>\u00a0Reinforcing joints in particleboard or MDF.<\/p>\n<\/li>\n

        • \n

          Marine:<\/strong>\u00a0Preventing corrosion in saltwater environments (stainless steel or brass).<\/p>\n<\/li>\n<\/ul>\n

          \n

          Excellent Case: Solar Panel Mounting<\/strong><\/h3>\n

          Scenario:<\/strong>\u00a0A solar energy company needs to secure photovoltaic panels to aluminum roof rails without damaging the thin panel frames.<\/p>\n

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

            \n
          1. \n

            Material Choice:<\/strong>\u00a0Stainless steel cup washers (corrosion-resistant, durable).<\/p>\n<\/li>\n

          2. \n

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

              \n
            • \n

              Cup washers are placed under bolt heads when attaching solar panels to mounting rails.<\/p>\n<\/li>\n

            • \n

              The concave shape distributes clamping force evenly, preventing frame deformation.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

            • \n

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

                \n
              • \n

                The panels remain securely fastened even under wind and thermal expansion.<\/p>\n<\/li>\n

              • \n

                No cracking or stress fractures in the aluminum frames.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                Benefits:<\/strong>
                \n\u2714\u00a0Prevents material damage<\/strong>\u00a0\u2013 Distributes load over a wider area.
                \n\u2714\u00a0Weather-resistant<\/strong>\u00a0\u2013 Stainless steel withstands rain, UV, and temperature changes.
                \n\u2714\u00a0Long-term reliability<\/strong>\u00a0\u2013 Reduces maintenance needs in solar farms.<\/p>","protected":false},"excerpt":{"rendered":"

                Customisable Cup Washers Galvanized Carbon Steel Cup Washer for Screw and Nut<\/p>","protected":false},"featured_media":3587,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[36],"product_tag":[1588,827,1584,1586,800,127,1582,1577,1587,1585,1581,125,126,1583,1580,1578,1579],"class_list":{"0":"post-3584","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-machined-washer","7":"product_tag-3mm-machined-washers","8":"product_tag-6mm-machined-washers","9":"product_tag-brass-screw-cup-washers","10":"product_tag-brass-screws-and-cup-washers","11":"product_tag-cnc-machined-washers","12":"product_tag-cnc-machining-washers","13":"product_tag-countersunk-cup-washers","14":"product_tag-cup-washers","15":"product_tag-cup-washers-mitre-10","16":"product_tag-custom-cup-washers","17":"product_tag-finishing-cup-washers","18":"product_tag-machined-washer","19":"product_tag-machined-washers","20":"product_tag-metal-cup-washers","21":"product_tag-screw-cup-washers","22":"product_tag-sinks-with-cup-washers","23":"product_tag-stainless-cup-washers","25":"first","26":"instock","27":"shipping-taxable","28":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/product\/3584","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/comments?post=3584"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/media\/3587"}],"wp:attachment":[{"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/media?parent=3584"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/product_brand?post=3584"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/product_cat?post=3584"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/machinedwasher.com\/hi\/wp-json\/wp\/v2\/product_tag?post=3584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}