3/8 Square Washers Square Washer Unistrut 1/2 1/4 For Carriage Bolt

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3/8 Square Washers Square Washer Unistrut 1/2 1/4 For Carriage Bolt

A square washer is a type of washer with a square – shaped outer perimeter and a central hole. Similar to other washers, its main functions include distributing the load of a threaded fastener (such as a bolt or a nut) over a larger area, preventing the fastener from loosening, and protecting the surface of the material being fastened from damage.

Materials

Carbon Steel : It is one of the most commonly used materials due to its relatively low cost, high strength, and good machinability. It can withstand a certain amount of stress and is suitable for general – purpose applications.

Stainless Steel : Offers excellent corrosion resistance, making it ideal for use in harsh environments where exposure to moisture, chemicals, or salt is likely. Common grades include 304 and 316 stainless steel.

Brass : Known for its good electrical conductivity, corrosion resistance, and aesthetic appearance. It is often used in electrical applications or in decorative hardware.

Aluminum : Lightweight and has good corrosion resistance. It is suitable for applications where weight reduction is a priority, such as in the aerospace or automotive industries.

Surface Treatments

Zinc Plating : This is a common surface treatment that provides a thin layer of zinc on the washer. Zinc plating enhances corrosion resistance and gives the washer a shiny appearance.

Hot – Dip Galvanizing : Involves dipping the washer into a bath of molten zinc. This process creates a thicker and more durable zinc coating, offering superior corrosion protection, especially in outdoor or highly corrosive environments.

Black Oxide Coating : Not only provides some degree of corrosion resistance but also gives the washer a black, aesthetically pleasing finish. It is often used in applications where a more discreet appearance is desired.

Powder Coating : A dry finishing process where a powder is electrostatically applied to the washer and then cured under heat. Powder coating can provide a wide range of colors and excellent corrosion and abrasion resistance.

 

Specifications

Size : Square washers are available in a variety of sizes, which are typically specified by the inner diameter (ID), outer diameter (OD), and thickness. For example, common inner diameters range from a few millimeters to several centimeters, and the outer dimensions of the square can vary accordingly.

Thickness : The thickness can range from very thin (e.g., 0.5 mm) for light – duty applications to relatively thick (e.g., 6 mm or more) for heavy – duty applications.

Tolerance : The manufacturing tolerances for square washers are usually defined according to relevant standards. For example, the tolerance for the inner diameter, outer dimensions, and thickness may be specified to ensure proper fit and performance.

Application Areas

Construction Industry : Square washers are widely used in building construction for fastening structural components, such as connecting steel beams, columns, and wooden frames. They help distribute the load and prevent the fasteners from pulling through the materials.

Automotive Industry : In automotive manufacturing, square washers are used in various parts, including engine mounts, suspension systems, and body panels. They play a role in ensuring the stability and reliability of these components.

Electrical Industry : Due to the availability of materials like brass and stainless steel with good electrical conductivity and corrosion resistance, square washers are used in electrical cabinets, circuit boards, and electrical appliances to secure electrical connections.

Furniture Manufacturing : Square washers are used to assemble furniture pieces, such as wooden or metal cabinets, chairs, and tables. They help prevent the fasteners from damaging the furniture surface and keep the joints tight.

Excellent Cases

Bridge Construction : In the construction of a large – scale bridge, square washers made of high – strength carbon steel with hot – dip galvanizing were used to fasten the steel girders and cross – beams. The square shape of the washers effectively distributed the heavy load from the bolts over a larger area of the steel members, ensuring the structural integrity of the bridge. The hot – dip galvanized coating provided long – term corrosion protection, even in the harsh outdoor environment with exposure to moisture and pollutants.

Automotive Engine Assembly : In a high – performance automotive engine, square washers made of stainless steel were used in the engine mountings. The stainless steel material offered excellent corrosion resistance to prevent rusting from engine oil, coolant, and road salt. The square washers helped evenly distribute the vibration and shock loads generated by the engine, reducing the stress on the fasteners and engine components, and improving the overall reliability and lifespan of the engine.

Electrical Substation : In an electrical substation, brass square washers were used to secure the busbars and electrical connectors. The good electrical conductivity of brass ensured efficient electrical transmission, while the square shape provided a stable and large – area contact surface. This helped to minimize electrical resistance and heat generation, improving the safety and efficiency of the electrical system.