S-95647A153 4.3 mm ID x 9 mm OD Plastic Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with Delrin® Acetal Plastic construction, eliminating rust issues in humid or chemical environments
• Excellent dimensional stability with precise 4.3mm ID and 9mm OD for perfect M4 screw compatibility and consistent performance
• High mechanical strength with Rockwell M90 hardness rating, ensuring reliable load distribution and long service life
• Wide temperature tolerance up to 180°F (82°C), maintaining structural integrity in various operating conditions
• Regulatory compliance assurance with RoHS 3 and REACH compliance, meeting strict international environmental standards
• Minimal thickness variation (0.7-0.9mm) for uniform pressure distribution and secure fastening applications
• Lightweight electrical insulation properties, ideal for electronic assemblies and applications requiring non-conductive components

Professional Applications & Engineering Value

These M4 metric flat washers manufactured from premium Delrin® Acetal Plastic provide critical solutions for engineering challenges where metal fasteners fail. The white acetal plastic construction offers inherent corrosion resistance, making them ideal for chemical processing, marine applications, and food equipment where moisture and corrosive agents degrade metal components. The low friction coefficient and excellent wear resistance of Delrin® material prevent galling and seizing in dynamic assemblies, while the precise 4.3mm ID ensures perfect alignment with M4 screws in automated production environments. These plastic flat washers serve as reliable electrical insulators in electronic enclosures and prevent galvanic corrosion between dissimilar metals, extending equipment lifespan in industrial machinery, automotive components, and consumer electronics applications.

Specification Summary & Compliance

This metric flat washer features precise dimensions with 4.3mm inner diameter, 9mm outer diameter, and 0.7-0.9mm thickness range, engineered for M4 screw size applications. Manufactured from Delrin® Acetal Plastic with Rockwell M90 hardness rating and maximum temperature resistance of 180°F. The product maintains dimensional accuracy suitable for industrial assembly requirements and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets and restricted substance compliance.