Washers may be small, but they play a big role in the stability, longevity, and safety of mechanical assemblies. Whether you're building wooden furniture, assembling a machine, or mounting solar panels, choosing the correct washer type can prevent common fastening failures like loosening, damage, or misalignment.
In this guide, we break down the most common types of washers—what they do, when to use them, and what mistakes to avoid.