Square Washer

Product Introduction

• Standard Name: Square Washer.

• Common Names: Square Washer, Square Washer.

• Product Definition: A flat washer with a square profile. Compared to round washers, its primary features include providing a larger effective bearing surface area and enhanced anti-rotation capability within limited installation spaces (such as the edges of channel steel or angle steel, or applications requiring specific positioning). It is commonly used in steel structures, wood structures, or equipment assembly.

Key Features of Square Washers

• Square Design: A square flat plate structure provides a larger bearing area and anti-rotation function,

  commonly used in channels, wood, or soft materials to prevent nuts from embedding or rotating.

• Material and Coating: Commonly made of carbon steel or stainless steel, with zinc plating (ZP), hot-dip

  galvanizing (HDG), or zinc plating for corrosion resistance; thicker for higher strength.

• Large Sizes: Larger outer diameter (larger than standard flat washers), inner diameter matches bolts,

  commonly used for heavy-duty connections, conforming to ASTM F436 or similar structural standards.

• Diverse Sizes: Inner diameter 1/4"-1" (M6-M24), side lengths up to 2-4 inches, suitable for high loads.

• Advantages: Even load distribution, reliable anti-rotation, economical and durable, suitable for

  structural applications.

Working Principle

• Placement: Placed below the nut/bolt head to increase the contact area.

• Pressure Distribution: When torque is applied, the clamping force is evenly distributed to prevent

  material deformation or embedding.

• Anti-rotation function: Square edges are embedded in channels or wood to prevent nuts from rotating.

• Protection and support: The coating provides corrosion protection, and the thick plate can withstand

  high loads; the principle involves area expansion and geometric locking.

Product Applications

• Steel structure engineering: Used with high-strength bolts to secure beams, columns, or frames,

  providing a large bearing surface.

• Timber connections: Embedded in timber beams or boards to prevent nuts from sinking into soft

  materials.

• Building and infrastructure: Roofing, fencing, or railing fixing; galvanized version is durable for outdoor

  use.

• Machinery: Assemble heavy-duty supports or bases to distribute forces evenly.

• DIY and maintenance: Enhance stability in home or industrial projects.