S-93785A823 0.343" ID x 0.688" OD ASME B18.21.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional thermal performance with a wide operating range from -20°F to 500°F, ensuring reliable service in extreme temperature environments
• Superior chemical resistance thanks to PEEK plastic construction, preventing degradation in harsh industrial settings
• Enhanced dimensional stability and durability with Rockwell M103 hardness, maintaining precise fit under load
• Guaranteed compliance with RoHS 3 and REACH regulations, making them safe for restricted substance-sensitive applications
• Precision-engineered sizing at 0.343" ID and 0.688" OD for 5/16" screws, ensuring perfect alignment and load distribution
• Rigorous quality assurance through adherence to ASME B18.21.1 standards, providing consistent performance and interchangeability
• Optimized thickness range of 0.040-0.080" for versatile spacing and tension control in various assembly configurations

Professional Applications & Engineering Value

Engineered for demanding environments, these PEEK plastic flat washers deliver critical solutions where metal components fail. The high-temperature resistance up to 500°F makes them ideal for aerospace, automotive, and chemical processing equipment, preventing thermal expansion issues. Their chemical inertness ensures longevity in corrosive settings, while the inch-system dimensions and ASME B18.21.1 compliance guarantee precise fit with 5/16" fasteners. The black color provides UV stability, and the Rockwell M103 hardness maintains structural integrity under vibration, reducing maintenance cycles in industrial machinery, electronics, and oil/gas applications.

Specification Summary & Compliance

This flat washer meets ASME B18.21.1 specifications for dimensional accuracy, with an inner diameter of 0.343", outer diameter of 0.688", and thickness ranging from 0.040" to 0.080". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are present. Manufactured from PEEK plastic with a temperature range of -20°F to 500°F and Rockwell M103 hardness, it is designed for consistent performance in standardized industrial assemblies.