Iron F436 WASHER 10-20mm

The F436 washer is a type of flat washer used primarily in high-strength applications, particularly in conjunction with heavy-duty fasteners like bolts and nuts. It is a specification under the ASTM F436 standard and is typically used in construction, infrastructure projects, and industrial machinery.

1. Material:

   • F436 washers are typically made from carbon steel or alloy steel. They may also be made from stainless steel or other materials for specific corrosion-resistant requirements, but the most common is carbon steel.

   • These washers are often hardened for additional strength and to resist deformation under heavy loads.

2. Standardization:

   • The ASTM F436 specification refers to washers that are specifically designed for use with high-strength bolts and nuts. They are designed to meet specific dimensional and mechanical requirements to ensure uniformity and reliability in fastening systems.

   • The F436 specification includes washers that are flat, round, and designed to distribute the load of the fastener more evenly, reducing stress on the material being fastened.

3. Dimensions:

   • F436 washers are available in a variety of sizes, but they are typically thicker than standard washers to handle the increased loads associated with high-strength bolts.

   • The washers come in several standard sizes, with outer diameters (OD) and inner diameters (ID) matching the bolt or nut sizes they are used with.

4. Heat Treatment:

   • In many cases, F436 washers are heat-treated or hardened to increase their tensile strength and prevent deformation under high-stress conditions.

   • The heat treatment also increases their resilience to fatigue, making them ideal for use in heavy-duty applications.

5. Function:

   • The primary role of an F436 washer is to distribute the load of a fastener over a larger surface area. This helps to prevent damage to the surface of the material being fastened and ensures a more secure and stable connection.

   • It also prevents fasteners from loosening due to vibration or pressure by creating a more stable and uniform contact area.

6. Surface Finish:

   • F436 washers are often available with zinc plating, hot-dip galvanizing, or plain finishes.

   • Zinc-plated F436 washers are commonly used in outdoor and high-moisture environments to protect against rust and corrosion.

   • Plain (uncoated) washers are typically used in indoor environments or where the fastener and washer will not be exposed to harsh environmental conditions.

• High-Strength Bolting: The F436 washer is often paired with high-strength bolts in applications requiring heavy-duty fastening, such as structural assemblies in bridges, highways, and buildings.

• Construction: Common in civil engineering projects such as bridges, overpasses, and skyscrapers where heavy loads and high stress are common.

• Industrial Machinery: Used in machinery and mechanical assemblies that are exposed to high pressures or forces.

• Heavy Equipment: Frequently found in construction and mining equipment where robust fasteners are essential for safety and reliability.

1. Increased Load Distribution: Helps to evenly distribute the load of a fastener, reducing stress on the material being fastened and preventing localized damage or wear.

2. Enhanced Durability: Hardened washers can withstand high-stress applications without deforming, offering increased longevity and reliability.

3. Resistant to Loosening: F436 washers help keep fasteners in place, preventing loosening due to vibration and movement in heavy-duty applications.

4. Standardized Dimensions: The washers are designed to meet ASTM F436 specifications, ensuring consistency and reliability in all application