Picture of a USS Hot Dipped Galvanized Flat Washer

Zinc Plated USS Flat Washers

Name: Zinc Plated USS Flat Washers
Brand: The Fastener Depot
SKU: FD344050
Price: 0.04 USD
Availability: InStock

by The Fastener Depot

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A zinc plated steel Type A Wide (USS) flat washer designed to evenly distribute load, dampen vibration, prevent bolt pull‑through, and serve as a spacer in wood or metal projects.

Material & Finish: Steel with zinc plating for corrosion resistance. Always match washer and fastener materials/finishes to avoid galvanic corrosion.
Standard: ASME B18.21.1 Type A covers flat washers #2–3″, with SAE profiles for #2–#12 and USS for 1 5/8″–3″.
Installation: Use with like‑finished fasteners, such as our zinc‑plated carriage bolts or hex bolts.
Use Cases: Deck framing for wood protection; machinery joints for vibration stability.

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Flat Washer Specifications

Learn more about dimensions, mechanical properties, and surface finish in our flat washer product spec sheet:

Read our Flat Washer spec sheet.

Flat Washer Additional Resources

What’s the difference between Type A Narrow and Type A Wide flat washers?

Type A Narrow washers are commonly called SAE washers, while Type A Wide washers are known as USS washers.

Why doesn’t ASME B18.21.1 list separate dimensions for SAE and USS washers for certain sizes?

For sizes smaller than ¼″ and larger than 1½″, ASME B18.21.1 gives only a single set of dimensions (it doesn’t specify “SAE” or “USS”). Instead, industry convention dictates which style applies to each range.

Which sizes are designated SAE (Type A Narrow) vs. USS (Type A Wide) by industry convention?

Washers from #2 up through #12 are treated as SAE (Type A Narrow) washers. Washers from 1 5/8″ up through 3″ are treated as USS (Type A Wide) washers.

Refund Policy

We offer a straightforward 30-day return policy for most unused items in their original condition. If something's not right, we'll work with you to make it right. Read our full refund policy.