S-98594A422 21.2 mm ID x 37 mm OD Plastic Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from polypropylene plastic construction, eliminating rust and chemical degradation in harsh environments
• Excellent electrical and thermal insulation properties, ideal for preventing galvanic corrosion and electrical short circuits
• Consistent dimensional stability with precise 21.2mm ID and 37mm OD, ensuring reliable fit and uniform load distribution for M20 screws
• Durable mechanical performance with Rockwell R85 hardness, maintaining shape under pressure and reducing wear
• Wide temperature tolerance up to 150°F (65°C), suitable for various industrial operating conditions without deformation
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring safety and environmental responsibility
• Lightweight and non-conductive design, reducing overall assembly weight while providing electrical isolation

Professional Applications & Engineering Value

This M20 flat washer made from polypropylene plastic addresses critical engineering challenges in corrosive and electrically sensitive environments. Unlike metal washers, it provides complete immunity to rust, oxidation, and electrolytic corrosion, making it perfect for chemical processing, marine, and food-grade applications. The off-white color and smooth surface facilitate cleanliness monitoring in sanitary installations. With its metric dimensions (21.2mm ID × 37mm OD) and consistent 3.0-3.3mm thickness, it ensures precise alignment and even pressure distribution for M20 screw fastening systems. The material's inherent dielectric properties prevent electrical conductivity between dissimilar metals, eliminating galvanic corrosion risks in electrical enclosures and structural assemblies.

Specification Summary & Compliance

This metric flat washer features precise dimensional tolerances with 21.2mm internal diameter and 37mm outer diameter, specifically engineered for M20 screw applications. The 3.0-3.3mm thickness provides consistent spacing and load distribution. Manufactured from polypropylene plastic with Rockwell R85 hardness rating, it maintains mechanical integrity under compression. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations regarding chemical safety, ensuring environmental responsibility and workplace safety standards.