S-98970A312 1.25" ID x 2.75" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel construction, ideal for outdoor or high-moisture industrial environments
• Enhanced load distribution due to the large 2.75" outer diameter, minimizing surface pressure and material deformation
• Precise fit for 1 1/8" screws with 1.25" inner diameter, ensuring secure fastening and reducing installation errors
• Heavy-duty durability from robust steel material, providing long-lasting performance in demanding mechanical applications
• Compliance with ASME B18.21.1 standards, guaranteeing consistent quality, dimensional accuracy, and reliable engineering use
• RoHS 3 compliance for environmentally safe usage, meeting strict regulatory requirements in various industries
• Versatile inch system sizing for seamless integration with existing equipment and standard fastener assemblies

Professional Applications & Engineering Value

These USS flat washers are engineered to address common industrial challenges such as corrosion, load stress, and fastener loosening. The hot-dipped galvanized steel provides a thick, protective zinc coating that significantly extends service life in harsh conditions like construction sites, marine applications, and heavy machinery. With dimensions of 1.25" ID and 2.75" OD, they offer optimal surface coverage to prevent bolt head or nut embedding into soft materials, distribute clamping force evenly, and reduce the risk of joint failure. This makes them indispensable for structural assemblies, equipment maintenance, and infrastructure projects where reliability and corrosion resistance are critical. Their adherence to ASME B18.21.1 ensures precise tolerances and consistent performance, supporting efficient installation and long-term operational safety.

Specification Summary & Compliance

This USS flat washer features an inner diameter of 1.25", outer diameter of 2.75", and thickness ranging from 0.136" to 0.192", designed for use with 1 1/8" screws in inch measurement systems. It conforms to ASME B18.21.1 specifications, ensuring dimensional accuracy and mechanical suitability for industrial applications. The product is RoHS 3 (2015/863/EU) Compliant, confirming it is free from hazardous substances and meets environmental safety standards for global supply chains.