Square Plate Washers

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Square plate washers are flat, square-shaped metal components primarily used to distribute the load of a fastener, such as a bolt or screw, over a larger surface area. By increasing the contact area between the fastener and the material being fastened, square plate washers help to minimise localised pressure, which could otherwise lead to material damage, deformation, or surface indentations.


In addition to preventing damage to the surface of softer or brittle materials, square plate washers also ensure a more secure, stable, and even hold by providing enhanced load distribution. This can be especially important in applications where the material being fastened is susceptible to cracking or warping under concentrated force. By spreading the force more evenly, square washers help to reduce the likelihood of failure at the fastening point, contributing to the overall durability and longevity of the assembly.

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What Are Square Plate Washers? 

Square plate washers are durable, load-distributing devices used to prevent damage, and increase the stability of fastened parts, and are especially useful in specific mechanical or construction applications. Unlike the more common round washers, square plate washers feature a square shape. This design provides a larger surface area for load distribution, making them ideal for use with soft or brittle materials that smaller washers could damage.

The square shape is also advantageous in situations where space is limited or when the washer needs to align with a square hole. Typically made from materials like steel, stainless steel, or other metals, square plate washers are chosen based on the specific application and required strength. These washers are widely used in industries such as construction, machinery, woodworking, and more, where securing components and protecting surfaces is essential. 

What Are Square Washers Used For? 

  • Load Distribution: Square plate washers help spread the pressure from bolts or screws across a wider area, reducing the risk of material deformation or damage, especially in softer materials like wood or plastic.
  • Aligning with Square Holes: Their square shape makes them ideal for use in applications where fasteners need to fit into square holes, ensuring a better fit and preventing slippage.
  • Securing Components: In mechanical and construction projects, square plate washers are used to ensure a secure connection between parts, particularly in heavy-duty applications where additional support is needed.
  • Preventing Surface Damage: Square plate washers are often used to protect the surface of the material being fastened from being damaged by the fastener, helping to maintain the integrity of the material.
  • Applications in Tight Spaces: The square shape is beneficial when space is limited or when washers need to fit in areas where round washers may be less effective.
  • Construction and Machinery: Square plate washers are commonly used in construction, machinery, woodworking, and other industries where securing parts and preventing surface damage are critical.

Benefits of Square Plate Washers 

  • Enhanced Load Distribution: The square shape of the washer provides a larger surface area to evenly distribute the load, reducing the risk of material damage or deformation.
  • Prevention of Surface Damage: Protects the surface of the material being fastened from damage caused by the fastener, ensuring a clean and intact finish.
  • Corrosion Resistance: The bright zinc-plated finish provides excellent corrosion resistance, making these washers ideal for use in outdoor or harsh environments.
  • Durability: Made from carbon steel, they offer strong resistance to wear and pressure, ensuring long-lasting performance even under heavy load conditions.
  • Compatibility with Soft or Brittle Materials: The larger surface area makes them perfect for use with softer or brittle materials that may be easily damaged by smaller washers.
  • Improved Fastener Stability: Helps to secure fasteners more effectively, preventing loosening and ensuring a more stable connection between components.
  • Ideal for Square Holes: Square shape makes them perfect for applications where washers need to fit into square holes, ensuring proper alignment and preventing slippage.
  • Versatility: Suitable for a wide range of applications, including construction, machinery, woodworking, and other industries requiring secure and stable fastenings.
  • Cost-Effective: Offering excellent performance at an affordable price, they are an economical solution for enhancing the stability and longevity of fastenings.
  • Easy to Handle and Install: Their simple, flat design makes them easy to handle, install, and replace as needed in a variety of applications.


Frequently Asked Square Plate Washers Questions

What Do M10, M12, M20, M8, and M16 Mean When Referring to Washers?

The terms M10, M12, M20, M8, and M16 refer to the size of the washer, specifically the diameter of the hole that the washer fits over. These are standard measurements used in fasteners and washers, and they correspond to the metric thread sizes for bolts or screws.

  • M10: Refers to a washer that fits a bolt or screw with a 10mm diameter.
  • M12: Refers to a washer that fits a bolt or screw with a 12mm diameter.
  • M20: Refers to a washer that fits a bolt or screw with a 20mm diameter.
  • M8: Refers to a washer that fits a bolt or screw with an 8mm diameter.
  • M16: Refers to a washer that fits a bolt or screw with a 16mm diameter.


These "M" values represent the nominal diameter (in millimetres/mm) of the threaded part of the bolt or screw. The corresponding washers are made to fit these bolts or screws snugly to ensure proper load distribution, secure fastening, and protection of the material being fastened.


So, when selecting a washer for a specific application, it's important to choose the correct size that matches the diameter of the bolt or screw being used to ensure optimal performance.

Why are Square Plate Washers Zinc-Plated?

The bright zinc-plated finish enhances the corrosion resistance of square plate washers, making them suitable for outdoor or harsh environments. This plating helps protect the products from rust and degradation, ensuring long-lasting performance even in challenging conditions.

Square Plate Washers vs Round Plate Washers - What’s the Difference?

The primary distinction between square plate washers and round plate washers lies in their shape, and this difference significantly impacts their performance and suitability for various fastening applications.


For applications where the fastener needs to bear a significant load or where stability is critical, square plate washers are often the preferred choice. Their larger and more even surface contact provides superior load distribution, reducing the risk of the fastener loosening over time or causing damage to the work material. They are especially useful in projects where a high level of security is needed and are often used in construction, machinery, and heavy-duty applications.


Round plate washers, while still versatile, are more commonly used in general-purpose applications where the need for load distribution is less critical. They are simpler to install and often used in situations where the material being fastened is not particularly sensitive to localised pressure or where space constraints prevent the use of larger washers.

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