Skip to content
Picture of a Silicon Bronze Flat Washer

Silicon Bronze Flat Washer

by The Fastener Depot

Swift Shipping

Most orders leave our warehouse within 24 hours.

A silicon bronze flat washer crafted for superior corrosion resistance and electrical conductivity, designed to evenly distribute load, dampen vibration, prevent bolt pull-through, and serve as a spacer in marine or electrical assemblies.
  • Material & Finish: Silicon bronze with a natural finish for excellent marine-grade corrosion protection and conductivity. Match with bronze or copper fasteners to avoid dissimilar-metal issues.
  • Standard: Conforms to ASME B18.21.1 Type A (#2–3″), applying SAE sizing for #2–#12 and USS for 1 5/8″–3″.
  • Use Cases: Boat fittings and electrical grounding assemblies requiring corrosion resistance and conductivity.
    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.

    Shop Other Categories

    Free Shipping

    When you spend $50+

    Support Small Business

    Support your community with every purchase!

    Quality Products

    Crafted to last with care and attention to detail.

    Here to Help

    Our friendly staff is here to support you 7 days a week.