Flat Washer Form B Mild Steel Zinc Plated

BS 4320

Sold Per Each

1. Definition and Purpose of Flat Washers

A flat washer is a thin, circular piece of metal with a hole in the center, designed to distribute the load of a threaded fastener, such as a bolt or nut. The primary purpose of flat washers is to prevent damage to the surface being fastened and to provide a smooth bearing surface for the fastener. They also help in preventing loosening due to vibration and can act as spacers.

2. Specifications of Flat Washer Form B

• Form B Design: This designation refers to the specific dimensions and shape of the washer according to industry standards. Form B washers typically have a larger outer diameter compared to other forms, which helps in distributing loads more effectively.

• Material - Mild Steel: Mild steel is a type of carbon steel that contains a low percentage of carbon (usually less than 0.25%). It is known for its ductility, malleability, and weldability, making it an ideal choice for various applications, including construction and manufacturing.

• Zinc Plating: The zinc plating process involves coating the mild steel washer with a layer of zinc. This provides corrosion resistance by acting as a sacrificial anode; if the coating gets scratched or damaged, the zinc will corrode before the underlying steel does. Zinc plating enhances durability and extends the lifespan of the washer when exposed to moisture or harsh environments.

• Grade 4.8: The grade designation indicates the mechanical properties of the mild steel used in manufacturing the washer. Grade 4.8 corresponds to specific tensile strength and yield strength characteristics:

  • Tensile Strength: Approximately 400 MPa (megapascals)
  • Yield Strength: Approximately 240 MPa This grading system helps ensure that components can withstand specified loads without failure.

3. Applications

Flat washers made from mild steel with zinc plating are widely used across various industries:

• Construction: Used in structural assemblies where bolts are employed.
• Automotive: Commonly found in vehicle assembly for securing parts together.
• Manufacturing: Utilized in machinery where fastening components are necessary.
• General Maintenance: Handy for repairs and installations requiring reliable fastening solutions.

4. Advantages

Using flat washers like those described has several advantages:

• Load Distribution: They help spread out forces applied by nuts and bolts over a larger area.
• Protection Against Damage: Prevents damage to surfaces being fastened by providing a smooth interface.
• Corrosion Resistance: The zinc coating protects against rusting, enhancing longevity.
• Cost-effective Solution: Generally inexpensive while providing significant benefits in terms of performance.