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Count 1/2-in Plain steel Square Washer

Fas-n-Tite   Count 1/2-in Plain steel Square Washer

Square plate washers provide greater bearing surface than standard cut washers and help distribute the load at critical connections. Meets SAE material standards.

Count 5/8-in Plain steel Square Washer

Fas-n-Tite   Count 5/8-in Plain steel Square Washer

Square plate washers provide greater bearing surface than standard cut washers and help distribute the load at critical connections. Meets SAE material standards.

Outdoor Accents 8-Count 1.469-in Powder-coated Finishing Washer

Simpson Strong-Tie   Outdoor Accents 8-Count 1.469-in Powder-coated Finishing Washer

The Outdoor Accents hex-head washer from Simpson Strong-Tie provides the decorative appearance of a bolt connection. Its patent-pending design enables a much easier installation time compared to through-bolting. The washer is code-listed (IAPMO). It is designed exclusively to fasten Outdoor Accents post bases, T and L straps and angles.

75-Count 1-3/4-in Plastic Beveled Washers

SPAX   75-Count 1-3/4-in Plastic Beveled Washers

The SPAX 1-3/4 in. dia. Plasti-Grip ci Prong insulation washer is the perfect solution to attach rigid insulation. Patented prongs enable pre-spotting for easy on-the-wall fastening. Appropriate for all substrates including masonry/foundation walls, wood and steel. Recommended for use with SPAX #8 or #10 Dia construction screws. Energy efficient and labor-saving attachment of all types of rigid insulation. Do it Once, Do it Right with SPAX.

25 Count #10 Zinc-plated Bonded Sealing Washer

Hillman   25 Count #10 Zinc-plated Bonded Sealing Washer

Plaster washers are about the size of a quarter and cost pennies. A drywall screw goes through the washer and is driven into the wood lath behind the plaster. The unique design of the plaster washers anchors the plaster firmly against the lath, stopping cracks and sagging.

Outdoor Accents Mission 1.469-in Powder-coated Finishing Washer

Simpson Strong-Tie   Outdoor Accents Mission 1.469-in Powder-coated Finishing Washer

The Outdoor Accents decorative hardware product line features connectors and fasteners that bring strength and style to custom outdoor living structures. The Mission Collection adds a hint of southwestern flair. The APDMW decorative washer installs easily with the Outdoor Accents structural wood screw and hex-head washer and can be used in a variety of wood-to-wood connections.

Outdoor Accents Avant 3-in Powder-coated Finishing Washer

Simpson Strong-Tie   Outdoor Accents Avant 3-in Powder-coated Finishing Washer

The Simpson Strong-Tie Outdoor Accents line of decorative hardware features connectors and fasteners that bring beauty and strength to custom outdoor living structures. The Avant Collection features straight edges and chamfered corners for a clean, timeless design. The APVDW decorative washer installs easily with the Outdoor Accents structural wood screw and hex-head washer and can be used in a variety of wood-to-wood connections.

75 Count 1/4-in Polychloroprene Bonded Sealing Washer

Hillman   75 Count 1/4-in Polychloroprene Bonded Sealing Washer

Sealing washers are used to prevent leakage, distribute pressure of the bolt or screw and also make a great cushioning agent to help with vibrations.

100 Count #10 Neoprene Bonded Sealing Washer

Hillman   100 Count #10 Neoprene Bonded Sealing Washer

Sealing washers are used to prevent leakage, distribute pressure of the bolt or screw and also make a great cushioning agent to help with vibrations.

15-Count #10 Stainless steel Finishing Washer

Hillman   15-Count #10 Stainless steel Finishing Washer

The finishing washer has an increased bearing surface and the sunken design gives a clean appearance. The washer is designed for use with flat or oval head screws. The call-out size is the inner diameter of the washer.

100 Count #8 Polychloroprene Bonded Sealing Washer

Hillman   100 Count #8 Polychloroprene Bonded Sealing Washer

Sealing washers are used to prevent leakage, distribute pressure of the bolt or screw and also make a great cushioning agent to help with vibrations.

16-Count #8 Stainless steel Finishing Washer

Hillman   16-Count #8 Stainless steel Finishing Washer

The finishing washer has an increased bearing surface and the sunken design gives a clean appearance. The washer is designed for use with flat or oval head screws. The call-out size is the inner diameter of the washer.

 Choose Square Washers for Stable and Reinforced Fastening Support

Square washers are designed to provide added surface coverage and improved load distribution compared to standard round washers. Their flat, square shape helps reinforce connections and reduce pull-through, especially in wood and structural applications. Lowe’s offers square washers suited for projects that require added stability and support, such as framing, fencing and outdoor construction.

Benefits of Square Washers

  • Improved Load Distribution: The wide surface area helps spread pressure evenly, reducing damage to wood, metal or composite materials.
  • Enhanced Stability: Square washers help reinforce joints and improve holding strength in structural connections.
  • Reduced Pull-Through: They’re ideal for use with large fasteners, where added surface contact is necessary.
  • Suitable for Wood Construction: These fasteners are commonly used in fencing, decking and framing applications.
  • Expanded Washer Options: Square fender washers and square plate washers support projects that require additional surface coverage.

Key Features of Square Washers

  • Flat, Square Design: They provide increased contact area compared to standard washers for added reinforcement.
  • Structural Support: Square washers are designed to help strengthen connections in load-bearing applications.
  • Protective Finishes: Washers are available with an epoxy finish to help resist wear and corrosion.
  • Consistent Alignment: Their square shape helps prevent rotation during installation.

How to Choose Square Washers

  • Application Type: Choose square washers for wood framing, fencing and structural builds or anywhere you need added reinforcement.
  • Washer Style: Square plate washers provide strong surface support, while square fender washers offer wide coverage for soft materials.
  • Finish Selection: Epoxy finishes support corrosion resistance, while black oxide provides a clean, low-profile appearance.
  • Fastener Pairing: Use square washers with carriage bolts or lag screws to help reinforce wood-to-wood or wood-to-metal connections.
  • Project Environment: Consider outdoor exposure and load requirements when selecting washer finishes.

From securing fence posts to reinforcing framing and outdoor structures, square washers help improve load distribution and connection strength. Whether paired with carriage bolts for fencing projects or lag screws in structural wood applications, these washers deliver reliable fastening performance. Shop square washers at Lowe’s now.