Square Dock Washers
What are square dock washers? Square dock washers are oversized, thick square washers used in dock, marine, and heavy timber construction to spread load and stop bolt heads and nuts from pulling into wood. The square profile adds flat sides that seat against timber and resist rotation, giving a broad, stiff bearing surface built for outdoor structural loads.
Why choose a square dock washer?
A square dock washer offers the same oversized, thick bearing as a round dock washer, with the added benefit of flat sides. Those sides seat against timber grain and resist turning under the fastener, which helps in dock and pier framing where the washer should stay put and spread load over a broad footprint. Like all dock washers, it is much thicker than a fender washer, built to carry structural loads, prevent pull-through on oversized or weathered holes, and resist cupping under high torque. Because these connections are outdoors near water, square dock washers are hot dipped galvanized for lasting corrosion resistance and pair with galvanized timber hardware.
Why choose square dock washers
- Oversized and thick: broad, stiff bearing for structural loads.
- Flat sides: seat against timber and resist rotation.
- Prevents pull-through: stops hardware embedding in wood.
- Outdoor built: hot dipped galvanized for marine exposure.
Common applications for square dock washers
- Dock and pier framing
- Marine and waterfront timber joints
- Heavy timber and structural wood
- Oversized or weathered bolt holes
For a round profile, see round dock washers, and browse every option on the main dock washers category.
Square Dock Washers FAQ
Why choose a square dock washer over a round one?
The flat sides seat against timber grain and resist rotation under the fastener, helping the washer stay located while it spreads load over a broad footprint.
Why are dock washers galvanized?
They are used outdoors near water, so the hot dipped galvanized coating gives lasting corrosion resistance in marine and waterfront conditions.
What are square dock washers used for?
Spreading load in dock, pier, and heavy timber construction, preventing hardware from pulling into wood, and stabilizing connections that see movement and impact.