S-93785A821 0.125" ID x 0.313" OD ASME B18.21.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability with a wide operating range from -20°F to 500°F, ideal for high-heat industrial environments
• Superior mechanical strength provided by Rockwell M103 hardness, ensuring reliable load distribution and vibration resistance
• Chemical and corrosion resistance inherent to PEEK plastic, perfect for harsh or corrosive operating conditions
• Precise dimensional fit with 0.125" ID and 0.313" OD, designed specifically for No. 4 screws to prevent loosening
• Rigorous quality assurance through compliance with ASME B18.21.1 standards, guaranteeing consistent performance
• Environmental and safety compliance with RoHS 3 and REACH regulations, ensuring safe use in regulated industries
• Reduced maintenance needs due to excellent durability and wear resistance, lowering long-term operational costs

Professional Applications & Engineering Value

Engineered for demanding scenarios, these PEEK plastic flat washers solve critical challenges in high-temperature and chemically aggressive settings. The black PEEK material maintains structural integrity under thermal stress up to 500°F, preventing deformation that can lead to fastener failure. With a Rockwell M103 hardness, they effectively distribute load and absorb vibrations in assemblies using No. 4 screws, reducing the risk of fatigue and extending equipment lifespan. Their inherent resistance to a broad range of chemicals makes them suitable for chemical processing, aerospace, and automotive applications, where metal washers might corrode. Compliance with ASME B18.21.1 ensures dimensional precision, facilitating easy installation and reliable performance in critical industrial fastening systems.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.125", outer diameter of 0.313", and thickness between 0.025" and 0.040", manufactured to ASME B18.21.1 specifications for consistent quality and fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards. The product is designed for use in the inch system and is rated for a maximum temperature of 500°F, making it a reliable choice for high-performance applications.