S-91133A165 0.812" ID Square Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to the galvanized steel coating, extending service life in harsh industrial environments
• Exceptional load distribution from the large 4" square design, preventing surface damage and joint loosening under heavy loads
• Precision fit for 3/4" screws with a 0.812" inner diameter, ensuring secure fastening and reducing installation errors
• Enhanced structural integrity provided by Rockwell B40 hardness, offering reliable performance in demanding applications
• Consistent dimensional stability with a thickness range of 0.235-0.265", guaranteeing uniform pressure distribution
• Global regulatory compliance with RoHS 3 and REACH standards, ensuring safe and unrestricted use in international markets
• Heavy-duty construction ideal for high-stress environments like construction and industrial machinery

Professional Applications & Engineering Value

This 4" square washer delivers critical engineering solutions where standard washers fail. The galvanized steel construction provides a robust barrier against rust and chemical exposure, making it ideal for outdoor construction, agricultural equipment, and marine applications. Its generous 4-inch width significantly increases bearing surface area, effectively distributing clamp load to prevent material crushing and bolt loosening in structural connections. The precise 0.812" ID ensures perfect alignment with 3/4" screws, eliminating installation delays while the Rockwell B40 hardness maintains dimensional stability under sustained vibration and load cycles. This combination of material strength and intelligent design solves common failure points in heavy machinery, bridgework, and industrial framing systems.

Specification Summary & Compliance

Manufactured to inch system standards with an inner diameter of 0.812", width of 4", and thickness tolerance of 0.235-0.265". Features Rockwell B40 hardness for consistent mechanical properties. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations (including 233 SVHCs as of 01/17/2023). Designed specifically for use with 3/4" screws in heavy-duty industrial applications.