What is a bridge washer?

Malleable Iron Washers
Import (left), Domestic (right)

This is a term that is frequently used across the industry. More often than not, “bridge washers” will refer to cast iron malleable iron washers. These washers are typically used in dock and wood construction. Malleable iron washers are specifically designed to prevent bolt heads and nuts from pulling into the wood. Detailers will also specify them in plans as “malleable washers”, “MI bridge washers”, or “MIW”. They will often state the bridge washers as malleable cast iron and conforming to ASTM A47.

If you have any questions about malleable washers, please give us a call and one of our experienced estimators will be more than happy to help out.

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