18-8 Stainless Steel Heavy Duty Flat Washer

Name: 18-8 Stainless Steel Heavy Duty Flat Washer
Brand: The Fastener Depot
SKU: FD390008
Price: 0.03 USD
Availability: InStock

by The Fastener Depot

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Most orders leave our warehouse within 24 hours.

Crafted from 18-8 stainless steel, this heavy-duty flat washer spreads clamping force, minimizes vibration, prevents bolt or screw pull-through, and can double as a spacer in demanding wood, metal, or outdoor applications.

Material & Finish: 18 8 stainless steel, naturally corrosion-resistant. Match with stainless fasteners to prevent dissimilar‐metal corrosion.
Standard: Manufactured to ASME B18.21.1 Type A (#2–3″), with SAE for #2–#12 and USS for 1 5/8″–3″.
Installation: Use with bolts of matching finish, such as carriage bolts and hex head bolts.
Use Cases: Outdoor deck hardware for rust-proof performance; equipment mounts needing secure load support.

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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.