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What are Galvanized Coating Washers?

Galvanized coating washers are vital components for corrosion resistance, especially in demanding environments. These washers are typically manufactured from steel and undergo a galvanization process where a protective zinc coating is applied. This coating acts as a barrier against moisture, chemicals, and other corrosive elements, significantly extending the service life of the assembly. They are often used in conjunction with various other fastener types, such as Flat Washers, to distribute load and prevent loosening under vibration. The durability of these washers makes them a preferred choice for outdoor construction, marine applications, and industrial machinery where long-term reliability is non-negotiable. Choosing the right washer, including Flat Washers, is crucial for maintaining structural integrity.


Technical Specifications of Galvanized Coating Washers

The performance of Galvanized Coating Washers is defined by a set of precise technical parameters. These specifications ensure compatibility and reliability in various applications. Key material properties and dimensional standards are detailed below to assist in your selection process.

  • Material: Carbon Steel (Grade 1008/1010), Stainless Steel (optional)
  • Coating Type: Hot-Dip Galvanized or Electro-Galvanized
  • Coating Thickness: Typically 5-25µm (0.2-1.0 mils) for electro-galvanized; 45-85µm (1.8-3.3 mils) for hot-dip.
  • Salt Spray Test Performance: Exceeds 72 hours to white rust, 240 hours to red rust for electro-galvanized; over 500 hours for hot-dip.
  • Hardness: HRB 70 - 100 (Rockwell B Scale)
  • Standards: Compliant with ASTM A153, ASTM B633, ISO 4042, and DIN 267.
Nominal Size (M) Inside Diameter (mm) Outside Diameter (mm) Thickness (mm) Approx. Weight per 1000 pcs (kg)
M4 4.5 9.0 0.8 0.32
M6 6.6 12.0 1.2 0.85
M8 9.0 16.0 1.6 1.90
M10 11.0 20.0 2.0 3.65
M12 13.5 24.0 2.5 6.80
M16 17.5 30.0 3.0 12.50

For specific application requirements not covered in the standard table, custom configurations of Galvanized Coating Washers can be engineered, including variations in zinc coating weight, surface passivation treatments for enhanced corrosion protection, and specific dimensional tolerances.

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