{"id":5423,"date":"2026-05-12T13:31:41","date_gmt":"2026-05-12T05:31:41","guid":{"rendered":"https:\/\/xzfastener.com\/?post_type=product&p=5423"},"modified":"2026-05-12T13:31:42","modified_gmt":"2026-05-12T05:31:42","slug":"din-603-stainless-steel-carriage-bolts-coach-bolts-mushroom-head-square-neck-bolts-for-wood-metal-applications","status":"publish","type":"product","link":"https:\/\/xzfastener.com\/vi\/products\/din-603-stainless-steel-carriage-bolts-coach-bolts-mushroom-head-square-neck-bolts-for-wood-metal-applications\/","title":{"rendered":"DIN 603 Stainless Steel Carriage Bolts | Coach Bolts | Mushroom Head Square Neck Bolts for Wood & Metal Applications"},"content":{"rendered":"
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Product Description<\/h2>\n

DIN 603 Stainless Steel Carriage Bolts, also known as Coach Bolts or Mushroom Head Square Neck Bolts, are widely used fastening components designed for secure and anti-rotation installation in wood, metal, construction, furniture, agricultural equipment, and industrial assemblies. Featuring a smooth domed mushroom head and square neck beneath the head, these bolts provide a clean appearance while preventing spinning during tightening.<\/p>\n

Manufactured according to DIN 603 standards, these carriage bolts are available in high-quality stainless steel grades such as A2 (304) and A4 (316), offering excellent corrosion resistance, high durability, and long service life in indoor, outdoor, and marine environments.<\/p>\n

The square neck locks into pre-drilled square or wooden holes, allowing the nut to be tightened from one side without requiring a tool on the bolt head. This makes DIN 603 carriage bolts ideal for timber structures, fencing systems, decking, machinery, playground equipment, and stainless steel assemblies.<\/p>\n

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Key Features<\/h2>\n
    \n
  • Manufactured according to DIN 603 standard<\/li>\n
  • Smooth mushroom dome head for safety and aesthetics<\/li>\n
  • Square neck design prevents bolt rotation during installation<\/li>\n
  • Excellent corrosion resistance for outdoor and humid environments<\/li>\n
  • Suitable for wood-to-wood and wood-to-metal fastening<\/li>\n
  • Available in full thread and partial thread options<\/li>\n
  • Easy one-sided installation<\/li>\n
  • Clean finished appearance without exposed hex heads<\/li>\n
  • Suitable for industrial, structural, and decorative applications<\/li>\n<\/ul>\n
    \n

    Available Materials<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n
    Material Grade<\/th>\nDescription<\/th>\nApplication<\/th>\n<\/tr>\n<\/thead>\n
    Stainless Steel A2 \/ 304<\/td>\nStandard corrosion-resistant stainless steel<\/td>\nGeneral outdoor & industrial use<\/td>\n<\/tr>\n
    Stainless Steel A4 \/ 316<\/td>\nMarine-grade stainless steel<\/td>\nCoastal & chemical environments<\/td>\n<\/tr>\n
    Carbon Steel<\/td>\nHigh strength economical option<\/td>\nIndoor & heavy-duty fastening<\/td>\n<\/tr>\n
    Zinc Plated Steel<\/td>\nCorrosion-protected carbon steel<\/td>\nGeneral industrial applications<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Surface Finishes<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n
    Finish<\/th>\nCharacteristics<\/th>\n<\/tr>\n<\/thead>\n
    Plain Stainless Steel<\/td>\nNatural corrosion resistance<\/td>\n<\/tr>\n
    Polished<\/td>\nDecorative and clean appearance<\/td>\n<\/tr>\n
    Zinc Plated<\/td>\nBasic rust protection<\/td>\n<\/tr>\n
    Hot Dip Galvanized<\/td>\nHeavy-duty outdoor protection<\/td>\n<\/tr>\n
    Black Oxide<\/td>\nIndustrial dark finish<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Product Structure<\/h2>\n

    DIN 603 carriage bolts consist of:<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n
    Part<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
    Mushroom Head<\/td>\nSmooth rounded surface for safety and appearance<\/td>\n<\/tr>\n
    Square Neck<\/td>\nPrevents rotation during tightening<\/td>\n<\/tr>\n
    Threaded Shank<\/td>\nSecures fastening with nut<\/td>\n<\/tr>\n
    Nut & Washer (Optional)<\/td>\nProvides locking and load distribution<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Technical Specifications<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Standard<\/th>\nDIN 603<\/th>\n<\/tr>\n<\/thead>\n
    Product Type<\/td>\nCarriage Bolt \/ Coach Bolt<\/td>\n<\/tr>\n
    Head Type<\/td>\nMushroom Dome Head<\/td>\n<\/tr>\n
    Neck Type<\/td>\nSquare Neck<\/td>\n<\/tr>\n
    Thread Type<\/td>\nMetric Coarse Thread<\/td>\n<\/tr>\n
    Material<\/td>\nStainless Steel 304 \/ 316<\/td>\n<\/tr>\n
    Thread Direction<\/td>\nRight-Hand Thread<\/td>\n<\/tr>\n
    Size Range<\/td>\nM5 \u2013 M20<\/td>\n<\/tr>\n
    Length Range<\/td>\n16mm \u2013 300mm<\/td>\n<\/tr>\n
    Application<\/td>\nWood, Construction, Machinery, Furniture<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Common Size Range<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n
    Diameter<\/th>\nCommon Lengths<\/th>\n<\/tr>\n<\/thead>\n
    M5<\/td>\n16mm \u2013 60mm<\/td>\n<\/tr>\n
    M6<\/td>\n20mm \u2013 100mm<\/td>\n<\/tr>\n
    M8<\/td>\n25mm \u2013 150mm<\/td>\n<\/tr>\n
    M10<\/td>\n30mm \u2013 200mm<\/td>\n<\/tr>\n
    M12<\/td>\n40mm \u2013 250mm<\/td>\n<\/tr>\n
    M16<\/td>\n50mm \u2013 300mm<\/td>\n<\/tr>\n
    M20<\/td>\n60mm \u2013 300mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Advantages of DIN 603 Carriage Bolts<\/h2>\n

    Anti-Rotation Design<\/h3>\n

    The square neck locks firmly into wood or square holes, preventing unwanted spinning during tightening.<\/p>\n

    Safe Smooth Head<\/h3>\n

    The rounded mushroom head reduces snagging and injury risks compared to hex head bolts.<\/p>\n

    Excellent Corrosion Resistance<\/h3>\n

    Stainless steel construction ensures long-lasting performance in humid, outdoor, and marine conditions.<\/p>\n

    Attractive Appearance<\/h3>\n

    Ideal for visible installations where aesthetics matter, such as furniture, fences, playgrounds, and architectural structures.<\/p>\n

    Easy Installation<\/h3>\n

    Can be installed using only one-side tool access.<\/p>\n

    \n

    Typical Applications<\/h2>\n
      \n
    • Wooden structures<\/li>\n
    • Timber framing<\/li>\n
    • Fence systems<\/li>\n
    • Decking construction<\/li>\n
    • Agricultural machinery<\/li>\n
    • Playground equipment<\/li>\n
    • Outdoor furniture<\/li>\n
    • Solar mounting systems<\/li>\n
    • Steel-to-wood assemblies<\/li>\n
    • Industrial equipment<\/li>\n<\/ul>\n
      \n

      DIN 603 Dimensional Reference<\/h2>\n
      \n
      \n\n\n\n\n\n\n\n\n\n\n\n
      Thread Size<\/th>\nPitch (P)<\/th>\nHead Diameter (dk)<\/th>\nSquare Neck (s)<\/th>\n<\/tr>\n<\/thead>\n
      M5<\/td>\n0.8<\/td>\n13.55mm<\/td>\n5mm<\/td>\n<\/tr>\n
      M6<\/td>\n1.0<\/td>\n16.55mm<\/td>\n6mm<\/td>\n<\/tr>\n
      M8<\/td>\n1.25<\/td>\n20.65mm<\/td>\n8mm<\/td>\n<\/tr>\n
      M10<\/td>\n1.5<\/td>\n24.65mm<\/td>\n10mm<\/td>\n<\/tr>\n
      M12<\/td>\n1.75<\/td>\n30.65mm<\/td>\n12mm<\/td>\n<\/tr>\n
      M16<\/td>\n2.0<\/td>\n38.8mm<\/td>\n16mm<\/td>\n<\/tr>\n
      M20<\/td>\n2.5<\/td>\n46.8mm<\/td>\n20mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
      \n

      Why Choose Stainless Steel DIN 603 Carriage Bolts?<\/h2>\n

      Stainless steel carriage bolts offer superior durability compared to ordinary carbon steel fasteners. They maintain structural integrity and appearance even after long-term exposure to moisture, rain, chemicals, and outdoor environments.<\/p>\n

      A2 stainless steel is suitable for most industrial and construction projects, while A4 stainless steel is recommended for marine, coastal, and chemical applications requiring enhanced corrosion resistance.<\/p>\n

      \n

      Packaging Options<\/h2>\n
      \n
      \n\n\n\n\n\n\n\n\n
      Packaging Type<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
      Small Box Packing<\/td>\nRetail & hardware distribution<\/td>\n<\/tr>\n
      Bulk Carton Packing<\/td>\nIndustrial wholesale supply<\/td>\n<\/tr>\n
      Pallet Packaging<\/td>\nExport shipment<\/td>\n<\/tr>\n
      Customized Packaging<\/td>\nOEM branding available<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
      \n

      FAQ<\/h2>\n

      What is the difference between a carriage bolt and a hex bolt?<\/h3>\n

      A carriage bolt has a smooth mushroom head and square neck designed to prevent rotation, while a hex bolt uses a hexagonal head tightened with a wrench.<\/p>\n

      Why is the square neck important?<\/h3>\n

      The square neck locks into wood or square holes to stop the bolt from spinning during tightening.<\/p>\n

      Are DIN 603 carriage bolts suitable for outdoor use?<\/h3>\n

      Yes. Stainless steel A2 and A4 carriage bolts provide excellent corrosion resistance for outdoor and humid environments.<\/p>\n

      What is the difference between A2 and A4 stainless steel?<\/h3>\n

      A2 (304) stainless steel is suitable for general applications, while A4 (316) offers superior resistance against saltwater and chemicals.<\/p>\n

      Can carriage bolts be used with metal?<\/h3>\n

      Yes. They are commonly used in wood-to-metal and metal-to-metal fastening applications when paired with washers and nuts.<\/p>\n

      Are custom sizes available?<\/h3>\n

      Yes. Customized diameters, lengths, materials, finishes, and packaging can be supplied according to project requirements.<\/p>\n

      What industries commonly use DIN 603 carriage bolts?<\/h3>\n

      Construction, furniture manufacturing, agriculture, machinery, transportation, fencing, and renewable energy industries widely use DIN 603 carriage bolts.<\/p>\n

      Do you provide OEM or customized packaging?<\/h3>\n

      Yes. OEM laser marking, custom labels, private packaging, and export carton solutions are available for bulk orders.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

      <\/div>\n","protected":false},"excerpt":{"rendered":"

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