Square Plate Washers

Square plate washers provide a large clamping surface designed to spread the load of bolts and fixings in structural, timber and construction applications.

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Square Plate Washer - Hot Dipped Galv

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Square Plate Washer - Zinc

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What Are Square Plate Washers?

Square plate washers are heavy-duty washers designed with a square shape to provide a larger bearing surface than standard round washers. This helps spread the clamping load of a bolt or fixing across a wider area of material.

The increased surface area helps reduce the risk of pull-through and improves load distribution, making square plate washers particularly useful in structural and timber construction applications.

Typical Applications

  • Structural timber connections
  • Steel and timber construction
  • Spreading the load of large bolts
  • Heavy duty bolted assemblies
  • General construction and repair work

Square Plate Washer Sizes

Square plate washers are available in a range of sizes designed to suit common structural bolt diameters. Popular sizes include M8, M10, M12 and M16 square plate washers used in construction and timber fixing applications.

Bolt Size Typical Plate Size Typical Use
M8 40mm × 40mm Timber construction fixings
M10 40mm × 40mm Structural bolt connections
M12 50mm × 50mm Heavy duty timber fixings
M16 50mm × 50mm Structural assemblies

Available Finishes

Square plate washers are available in different finishes depending on the application environment:

For lighter load spreading applications, standard flat washers such as Form A, Form B or Form C washers may also be suitable.

Looking for other washer types? Explore our full washer range, including Form A, Form B, Form C, penny repair washers, spring washers and square plate washers.