S-93303A101 0.25" ID x 0.5" OD Rubber Sealing Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability for reliable performance in extreme temperatures from -20°F to 460°F, preventing material degradation in demanding industrial environments.
• Superior vibration dampening and sealing properties from the Aramid Fabric/Buna-N Rubber composite, reducing equipment wear and preventing loosening under dynamic loads.
• Optimized hardness (Durometer 70A) provides the ideal balance between flexibility for conforming to surfaces and firmness to maintain effective load distribution.
• Precision-engineered dimensions (0.25" ID, 0.5" OD) ensure a perfect fit for 1/4" screws, facilitating easy installation and consistent performance.
• RoHS 3 (2015/863/EU) compliance guarantees the washer is free from hazardous substances, making it suitable for use in regulated industries and global supply chains.
• Enhanced durability and chemical resistance from the Aramid Fabric reinforcement within the Buna-N Rubber matrix, extending service life in harsh operating conditions.
• Color-coded identification with its distinct green color allows for quick visual inspection and part verification in complex assemblies.

Professional Applications & Engineering Value

This flat washer is engineered to solve critical challenges in high-stress, thermally volatile applications. The unique Aramid Fabric/Buna-N Rubber construction directly addresses the common failure points of standard washers, such as cracking under thermal cycling or losing compression over time. In industries like automotive manufacturing, aerospace, and heavy machinery, where components are subjected to temperatures from -20°F to 460°F, this washer maintains its integrity, providing a consistent seal and load-bearing surface. Its composite design effectively absorbs vibration, a key contributor to joint fatigue and screw loosening. By specifying this high-temperature washer, engineers can enhance the reliability and longevity of assemblies in engines, pumps, and industrial ovens, reducing maintenance frequency and preventing costly downtime.

Specification Summary & Compliance

This washer conforms to the inch system of measurement with precise dimensions: Inside Diameter (ID) of 0.25", Outside Diameter (OD) of 0.5", and a Thickness range of 0.054-0.070", designed for a 1/4" screw size. The material specification is a composite of Aramid Fabric and Buna-N Rubber with a defined Durometer 70A hardness. It is verified to be RoHS 3 (2015/863/EU) Compliant, ensuring adherence to strict environmental and safety standards for hazardous substance restrictions.