20mm Gi Flat Washer

Key specs: material is hot-dipped galvanized steel (GI), outer diameter about 20mm, designed for corrosion resistance, suitable for both indoor and outdoor applications, and sold packaged by weight (per kilogram).

Common uses include deck connections, lag bolts, screws for wooden or metal assemblies, and any task where you need to distribute load and protect surfaces from a bolt head or nut. Its 20mm size makes it versatile for various hardware projects.

1) Ensure the bolt/shank diameter matches the washer’s inner hole size. 2) Place the washer between the fastener and the surface or under the nut/bolt head. 3) Tighten to the appropriate torque for the fastener material and application. 4) Check that the washer lies flat and distributes load evenly.

GI flat washers are typically more cost-effective and offer good corrosion resistance in general environments, especially with outdoor exposure. Stainless steel washers generally provide superior corrosion resistance and durability in harsh or highly corrosive environments but at a higher cost. For a stainless option, see: https://fepy.com/product/20mm-stainless-steel-flat-washer

Zinc-plated washers are usually less robust against corrosion than hot-dip galvanized ones in outdoor or highly humid conditions. GI with hot-dipped coating offers better long-term protection in many environments. For a zinc-plated alternative, see: https://fepy.com/product/20mm-zinc-plated-flat-washer

Yes. The hot-dipped galvanized coating provides enhanced corrosion resistance, making it suitable for outdoor installations and damp environments.

It means the washers are sold by weight rather than in a fixed-count package. The exact number of washers per kilogram can vary with thickness and exact inner diameter, which makes it convenient for sampling and bulk buying.

Check the outer diameter (20mm in this case), the inner hole size to match your bolt, the thickness, and the coating type (hot-dipped galvanized). Also consider the environment (indoor vs outdoor) and whether you prefer bulk kilogram packaging for sampling or bulk use.

Wear basic PPE when handling metal hardware to prevent cuts. Ensure the washer is clean and free of burrs. Avoid mixing dissimilar metals in damp or corrosive environments to minimize galvanic corrosion. Store in a dry place to maximize longevity.

Value comes from corrosion resistance (hot-dip galvanizing), suitability for outdoor/indoor use, versatility for various fasteners, and the convenience of kilogram-based packaging for sampling or bulk needs. If you need a higher-end option for extreme environments, compare with stainless steel or specialized coatings on Fepy.