Zinc Plated Steel USS Flat Washers

When to use zinc plated USS washers

Zinc plated USS washers combine a broad bearing surface with an economical finish, making them the go-to for general construction, machinery, and larger fasteners in dry and mild conditions. The wide USS pattern spreads clamping load and protects the mating surface, while the zinc plating resists rust far better than bare steel. For heavier outdoor or wet exposure, hot dipped galvanized offers a thicker coating, and for high-strength joints a thru-hardened Grade 8 washer resists deformation.

Why choose zinc plated USS flat washers

• Wide bearing: USS pattern spreads load over a broad surface.
• Economical: cost-effective zinc finish for common jobs.
• Corrosion resistant: zinc plating protects better than bare steel.
• General purpose: the everyday wide-pattern washer.

Common applications for zinc plated USS washers

• General construction and framing
• Larger fasteners needing wide bearing
• Machinery and equipment
• Indoor and dry outdoor work

For heavier outdoor protection, see hot dipped galvanized USS flat washers, and browse every option on the main flat washers category.

Zinc Plated USS Flat Washers FAQ

Are zinc plated USS washers good outdoors?

The zinc plating suits indoor and general dry outdoor use. For heavier outdoor or wet exposure, choose hot dipped galvanized.

What is the difference from an SAE washer?

The USS pattern is wider and thicker than SAE for the same bolt, spreading load over more surface. SAE suits automotive and tight clearances.

Do these washers have a strength grade?

Plain zinc USS washers are a dimensional pattern without a defined grade. For high-strength joints, use a thru-hardened Grade 8 washer.