S-91117A237 0.812" ID x 3" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction, extending service life in harsh environments
• Optimal load distribution from the 3" outer diameter, preventing surface damage and joint loosening
• Precise fit for 3/4" screws with 0.812" inner diameter, ensuring secure fastening alignment
• Consistent performance under pressure due to Rockwell B40 hardness, maintaining structural integrity
• Reliable thickness tolerance (0.110-0.140") for uniform compression and vibration resistance
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe usage in regulated industries
• Durable material strength suitable for heavy-duty mechanical and construction applications

Professional Applications & Engineering Value

This zinc-plated steel flat washer is engineered to address critical challenges in industrial fastening, such as corrosion-induced failure and load instability. The zinc plating provides a protective barrier against moisture and chemicals, significantly reducing maintenance needs in outdoor or high-humidity settings like construction sites and machinery assemblies. With its large 3" OD and precise 0.812" ID, it effectively distributes clamping force for 3/4" screw size applications, minimizing stress concentration on connected surfaces. This design is ideal for heavy-duty washers used in structural frameworks, automotive components, and industrial equipment, where consistent performance and longevity are paramount. The robust Rockwell B40 hardness ensures the washer retains its shape under repetitive loads, preventing deformation that could compromise fastener integrity.

Specification Summary & Compliance

This flat washer adheres to inch measurement standards with an inner diameter of 0.812", outer diameter of 3", and thickness range of 0.110-0.140". It is manufactured from zinc-plated steel with a hardness rating of Rockwell B40 to maintain dimensional stability. The product complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and is REACH (EC 1907/2006) compliant, meeting stringent environmental and safety regulations for industrial use.