S-91201A039 1.156" ID x 2.25" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior load distribution with precise 0.308-0.318" thickness to prevent joint loosening and surface damage
• Exceptional durability from Rockwell B84 hardness steel, resisting deformation under heavy loads
• Perfect fit compatibility with 1 1/8" screws through 1.156" ID and 2.25" OD dimensional accuracy
• Enhanced corrosion resistance through high-quality steel construction for extended service life
• Regulatory compliance assurance with RoHS 3 and REACH standards for global industrial applications
• Heavy-duty performance in demanding environments thanks to robust inch-system manufacturing
• Reliable fastener protection that maintains structural integrity across vibration-intensive applications

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this steel flat washer solves critical challenges in machinery assembly, structural fastening, and equipment manufacturing. The Rockwell B84 hardness ensures the washer maintains its shape under extreme pressure, preventing fastener loosening in high-vibration environments. With precise 1.156" ID and 2.25" OD dimensions specifically designed for 1 1/8" screw size compatibility, it provides optimal surface contact and load distribution across joined components. The substantial 0.308-0.318" thickness offers superior bearing surface protection against embedding and surface damage, while the steel material provides inherent corrosion resistance for long-term reliability in harsh operating conditions common in construction, manufacturing, and heavy equipment industries.

Specification Summary & Compliance

This flat washer maintains precise inch-system dimensional tolerances with 1.156" inner diameter, 2.25" outer diameter, and 0.308-0.318" thickness range. Manufactured from high-strength steel with Rockwell B84 hardness rating, it ensures consistent performance in demanding applications. The product is fully RoHS 3 (2015/863/EU) compliant with exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) compliant with the latest SVHC requirements as of January 17, 2023, meeting international regulatory standards for industrial fasteners.