S-91666A120 4.3 mm ID x 9 mm OD Plastic Washers

Key Features & Benefits at a Glance

• Superior chemical resistance from PVDF plastic material, ideal for harsh industrial environments with exposure to corrosive substances.
• Excellent thermal stability withstanding temperatures up to 300°F (approx. 149°C), ensuring reliable performance in high-heat applications.
• Precise M4 screw compatibility with a 4.3mm inner diameter and 9mm outer diameter, providing a secure and stable fit for metric fastening systems.
• Enhanced durability and load distribution due to Rockwell R93 hardness and flat washer design, reducing surface pressure and preventing damage to assembled components.
• Strict regulatory compliance with RoHS 3 and REACH standards, guaranteeing safety and environmental responsibility for global supply chains.
• Consistent dimensional accuracy with a thickness of 0.7-1.0mm, ensuring uniform performance and ease of installation in automated or manual assembly.
• Reliable electrical insulation properties inherent to PVDF plastic, making it suitable for electronic and electrical applications where conductivity must be avoided.

Professional Applications & Engineering Value

Engineered for demanding settings, these M4 PVDF plastic flat washers address critical challenges in chemical processing, semiconductor manufacturing, and food processing equipment. The PVDF material offers exceptional resistance to acids, bases, and solvents, preventing degradation and failure in aggressive environments. With a maximum temperature rating of 300°F, they maintain integrity in thermal cycles, while the white color and smooth surface support cleanliness protocols. The metric dimensions and flat washer design ensure even load distribution, protecting sensitive surfaces from stress and corrosion, thereby extending equipment lifespan and reducing maintenance costs in industrial applications.

Specification Summary & Compliance

This washer conforms to standard metric flat washer dimensional expectations with an inner diameter of 4.3mm, outer diameter of 9mm, and thickness range of 0.7-1.0mm for use with M4 screw sizes. Manufactured from PVDF plastic with a hardness of Rockwell R93, it is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant as of January 17, 2023, ensuring adherence to strict environmental and safety regulations for hazardous substances.