Square Plate Washers – Hot Dipped Galv – Box

Galvanised square plate washers are the go-to fixing component when a standard round washer simply isn’t doing enough to hold things together. Where a bolt or coach screw is pulling through soft or engineered timber, the large 50x50mm face of these plate washers distributes that load across a far greater surface area, keeping the connection solid without the fastener sinking in or working loose over time.

These are hot dipped galvanised, not electroplated. That matters. The hot dip process gives a thicker, more durable zinc coating that genuinely stands up to outdoor exposure, whether that’s a fence panel, a timber frame outbuilding, or ground-level structural work where moisture is a constant. Electroplated washers go rusty quickly in those conditions. These won’t give you that problem.

Where Galvanised Square Plate Washers Earn Their Keep

You’ll see these used heavily in timber frame construction, fencing, gate hanging, decking subframes, and agricultural buildings. They’re commonly used with M10 and M12 coach bolts or threaded rod to clamp timbers together or to anchor sole plates and posts. The square profile also helps in situations where you need the washer to sit across a joint or overlap two members, something a round washer can’t always do neatly.

The 3mm thickness gives enough rigidity that the washer won’t deform under torque. Tighten an M12 nut down hard onto one of these and it stays flat, spreads the load, and holds its shape. Compare that to thin-stamped washers and you’ll notice the difference immediately.

Pack Size and Practical Value

Both M10 and M12 sizes come in boxes of 100, which is a sensible quantity for any structural job or ongoing site supply. Running out of plate washers mid-frame is the kind of thing that adds an hour to your day for no good reason. Having a box on the van covers most jobs without thinking about it.