S-93303A103 0.312" ID x 0.625" OD Rubber Sealing Washers

Key Features & Benefits at a Glance

• Exceptional temperature resistance from -20°F to 460°F for reliable performance in extreme thermal environments
• Superior sealing and vibration damping through the Aramid Fabric/Buna-N Rubber composite construction
• Consistent 70A durometer hardness maintains structural integrity and load distribution under pressure
• Precision-engineered dimensions (0.312" ID x 0.625" OD) ensure perfect fit with 5/16" fasteners
• RoHS 3 compliance guarantees environmental safety and meets global regulatory standards
• High-visibility green color enables easy identification and inventory management
• Composite material durability resists wear, chemicals, and compression set for extended service life

Professional Applications & Engineering Value

This high-temperature flat washer combines Aramid Fabric reinforcement with Buna-N Rubber to solve critical engineering challenges in demanding industrial environments. The composite material delivers exceptional thermal stability, maintaining its 70A durometer hardness across a wide temperature range from -20°F to 460°F, preventing brittleness in cold conditions and maintaining seal integrity under extreme heat. The 5/16" screw compatibility with precise 0.312" ID and 0.625" OD dimensions ensures perfect alignment and uniform load distribution in heavy-duty applications including automotive, aerospace, and industrial machinery where thermal cycling, vibration damping, and chemical resistance are paramount. The material's inherent properties provide excellent compression resistance and longevity, reducing maintenance frequency and downtime in critical assemblies.

Specification Summary & Compliance

This flat washer features inch system dimensions with 0.312" internal diameter, 0.625" outer diameter, and 0.054-0.070" thickness range, engineered for precise 5/16" screw compatibility. The washer maintains Durometer 70A hardness throughout its operational temperature range and is manufactured to meet RoHS 3 (2015/863/EU) compliance standards, ensuring environmental safety and regulatory adherence for industrial applications worldwide.