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3" x 3" square plate washers
3" x 3" square plate washers Specs
3" x 3" square plate washers secures wood to concrete
3" x 3" square plate washers - 1/4" thick 6 gauge steel
3" x 3" square plate washers for 5/8" anchor bolts
5/8" diameter square plate washers
flat steel square plate washers 3 inch x 3 inch

3" x 3" Square Plate Washer - 5/8" Anchor Bolt Diameter

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All orders placed before 12PM PST Monday - Friday are shipped same day (holidays excluded).

Secure Wood-to-Concrete With These Sturdy Steel Square Washer!

Constructed from sturdy 6 gauge steel, this 3" x 3" square plate washer (also known as a bearing plate) is designed for use with 5/8" diameter anchor bolts or rods. Its heavy-duty design prevents pull-through and promotes a secure connection, while increasing the bearing surface to prevent wood splitting or cracking. Ideal for anchoring wood to concrete slabs, this washer provides long-lasting structural stability.

This product is also available in a galvanized option.

Sandbaggy carries a variety of concrete forming supplies.


  • Material: Steel
  • Gauge: 6
  • Length: 3 inch
  • Width: 3 inch
  • Thickness: 1/4 inch
  • Hole Diameter: 5/8 inch
  • Type: Flat
  • Flat Type: Square
  • Weight: 6.9 oz (0.43 lbs)


  • Compatible With 5/8" Anchor Bolts or Rod: Hole diameter is 5/8", the flat square washer design distributes anchor bolt load over a larger surface area.
  • Ensures Secure Wood-To-Concrete Connection: Prevents anchor bolt pull-through in wood
  • Prevent Wood Splitting or Cracking that may occur around the anchor bolt, ensuring structural stability and integrity.
  • Heavy 6 Gauge Steel: Constructed from 1/4" thick steel to promote long-lasting structural stability.
  • Maintains Alignment: Square shape prevents rotation and maintains alignment under stress.


What are square washers called?

Square washers, also referred to as construction washers, plate washers, or fish plates in certain contexts.

Why use square washers?

Square washers offer several advantages over traditional round washers:

  • Increased load distribution: They provide a larger surface area to distribute the load of a bolt or screw, reducing pressure and preventing damage to the underlying material.
  • Prevent rotation: Their square shape helps prevent the fastener from rotating, ensuring a secure connection.

What is the difference between a flat washer and a square washer?

Square washers are a type of flat washer, though flat washers generally refer to round washers.

  • Shape: Flat washers are round, while square washers are, well,
  • Load distribution: Square washers generally have a larger surface area than flat washers of the same nominal size, offering better load distribution.

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