Square Hole Plate Washer

Square Hole Plate Washers are essential components in holding down systems, designed to lock onto square-shanked bolts and distribute load across a wider surface. Manufactured from 10 mm-thick mild steel, these washers prevent bolt pull-through and ensure stability under high loads.

Available in multiple sizes, including M16 (100 × 100 mm), M20, M24 and M30 in 100 mm and 150 mm plate options, they are suitable for a wide range of foundation anchoring applications.

Key Features

• Heavy-duty mild steel construction.

• 10 mm thickness for maximum strength.

• Square hole prevents bolt rotation.

• Available in M16, M20, M24 & M30.

• Plate sizes: 100 × 100 mm and 150 × 150 mm.

• Galvanised finish available – contact us on 020 8079 7719.

• Bespoke sizes available on request.

• UK stock with next-day delivery.

FAQ
Why use square hole plate washers?
They lock the bolt in place and spread the load across a larger area of concrete, improving stability.

What sizes are available?
M16–M30 with 100 mm or 150 mm square plates.

Do you offer galvanised washers?
Yes, we can supply galvanised washers for corrosion resistance.

Are custom sizes available?
Yes, we can manufacture bespoke plate washers to suit your requirements.