Zinc Plated Flat Washer

Are Zinc Washers Better Than Steel?

When comparing zinc washers to plain steel washers, the key difference lies in corrosion resistance and longevity. A zinc washer is essentially a steel washer that has been coated with a layer of zinc. This coating acts as a sacrificial barrier, protecting the steel underneath from rust and oxidation. As a result, zinc washers last significantly longer in humid or outdoor environments compared to untreated steel washers, which can corrode quickly when exposed to moisture. Zinc washers also have a smoother surface finish, which can improve the appearance of the assembly while providing some lubricity during tightening. However, it’s important to note that zinc coatings are relatively thin and may not withstand extremely harsh or corrosive environments for extended periods. In such cases, alternatives like hot-dip galvanized washers or stainless steel washers may be more appropriate. On the other hand, plain steel washers are typically stronger in terms of raw tensile capacity because they are not altered by coatings. They are often used in applications where corrosion is not a concern, such as indoor machinery, temporary fixtures, or in cost-sensitive projects. In summary, zinc washers are generally considered better than plain steel washers when it comes to resisting rust, extending service life, and offering improved performance in outdoor or damp conditions. Steel washers, while less expensive, may require additional protective measures if used in environments where moisture is present. The choice depends on balancing cost, strength, and environmental factors.