S-91133A189 1.312" ID Square Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with galvanized steel construction, ideal for harsh industrial environments and outdoor applications.
• Superior load distribution due to the large 3" square profile, minimizing surface pressure and preventing material damage.
• Enhanced durability and deformation resistance provided by the Rockwell B40 hardness rating, ensuring long-term performance under heavy loads.
• Reliable fit and secure fastening for 1 1/4" screws, thanks to the precise 1.312" inner diameter.
• Robust structural support from the substantial 0.220-0.280" thickness range, making it a true heavy-duty component.
• Global compliance assurance with RoHS 3 and REACH regulations, guaranteeing safe and unrestricted use in international markets.
• Versatile inch-system compatibility for seamless integration into existing North American machinery and structural assemblies.

Professional Applications & Engineering Value

This heavy-duty square washer is engineered to solve critical challenges in demanding applications. The galvanized steel material provides a robust barrier against rust and corrosion, significantly extending the service life of assemblies exposed to moisture, chemicals, or weathering. Its large 3" width and substantial thickness are crucial for distributing immense clamping forces over a wider area, which prevents bolt head embedment, reduces stress concentrations on soft materials like wood, and maintains joint integrity in construction and heavy machinery. The precise 1.312" ID ensures a perfect fit for 1 1/4" screw sizes, eliminating play and enhancing the overall stability of the connection. This makes it an indispensable component for structural steelwork, industrial equipment framing, and other high-stress industrial fastening scenarios where failure is not an option.

Specification Summary & Compliance

This square washer conforms to standard inch system dimensions with an Inner Diameter of 1.312", Width of 3", and a Thickness range of 0.220-0.280". The material is Galvanized Steel with a specified Rockwell B40 hardness. It is manufactured to be compliant with RoHS 3 (2015/863/EU) under exemption 6(a) and is fully REACH (EC 1907/2006) compliant, ensuring adherence to stringent environmental and safety standards for industrial components.