S-91435A240 0.281" ID x 0.875" OD ASTM D5213 Plastic Washers

Key Features & Benefits at a Glance

• Extreme Temperature Resilience: Withstands temperatures from -450°F to 750°F, ensuring reliable performance in harsh thermal environments without degradation.
• Superior Chemical and Wear Resistance: Made from durable polyimide plastic, offering excellent resistance to chemicals, abrasion, and wear for long-lasting use.
• Precise Fit and Easy Installation: Features an exact 0.281" inner diameter and 0.875" outer diameter, designed for seamless compatibility with 1/4" screws.
• Lightweight and Non-Conductive: Provides electrical insulation and reduces overall assembly weight, ideal for sensitive electronic and aerospace applications.
• Compliance with Industry Standards: Meets ASTM D5213 specifications, guaranteeing consistent quality and performance in demanding industrial settings.
• Minimal Thickness Variation: Uniform thickness of 0.005-0.006" ensures even load distribution and prevents loosening under vibration or stress.
• Amber Color for Easy Identification: Distinct amber hue allows for quick visual inspection and sorting, streamlining inventory and assembly processes.

Professional Applications & Engineering Value

This polyimide plastic flat washer is engineered to solve critical challenges in high-stress environments, such as aerospace, automotive, and electronics manufacturing. Its high-temperature rating from -450°F to 750°F prevents melting or brittleness, addressing common failure points in thermal cycling applications. The amber-colored design not only aids in identification but also reflects the material's purity and resistance to degradation. By utilizing ASTM D5213 compliant polyimide, it offers exceptional dimensional stability and low outgassing, making it ideal for vacuum or cleanroom settings. This washer ensures secure fastening for 1/4" screws, reducing maintenance downtime and enhancing the longevity of assemblies exposed to extreme conditions.

Specification Summary & Compliance

This flat washer adheres to precise dimensional tolerances with an ID of 0.281", OD of 0.875", and thickness of 0.005-0.006", ensuring consistent fit for 1/4" screw sizes. It conforms to ASTM D5213 standards for polyimide plastics, validating its material properties and performance. The product is designed for use in inch measurement systems and meets common industry requirements for high-temperature and chemical resistance. While not specifically rated for hardness, it complies with relevant specifications for thermal and mechanical stability, supporting applications in regulated sectors without additional certifications like RoHS or REACH, unless specified by custom order.