S-95649A330 4.3 mm ID x 9 mm OD Plastic Washers

Key Features & Benefits at a Glance

• Exceptional chemical resistance for reliable performance in harsh industrial environments where corrosion is a concern.
• Low coefficient of friction from UHMW plastic material reduces wear on components and allows for smoother assembly adjustments.
• Lightweight and non-conductive properties make it ideal for electrical applications and for reducing overall assembly weight.
• Durable off-white UHMW construction provides excellent impact resistance and long service life, even with repeated use.
• Precision metric sizing (4.3mm ID, 9mm OD) ensures a perfect fit for M4 screws, preventing loosening and maintaining assembly integrity.
• High-temperature tolerance up to 180°F allows for use in applications with moderate thermal fluctuations without degrading performance.
• Full RoHS 3 and REACH compliance guarantees that the washer meets stringent international environmental and safety standards for hazardous substances.

Professional Applications & Engineering Value

This UHMW plastic flat washer is engineered to solve critical challenges in industrial and engineering assemblies. Its non-metallic, off-white UHMW material offers superior chemical resistance, making it an ideal choice for applications exposed to corrosive substances where metal washers would fail. The low friction and self-lubricating properties prevent galling and seizing on M4 screws, ensuring smooth disassembly for maintenance. This is particularly valuable in food processing, packaging machinery, and electrical enclosures, where non-conductivity and compliance with hygiene standards are paramount. The precise metric dimensions (4.3mm ID, 9mm OD) and consistent 0.7-0.9mm thickness provide a reliable seal and load distribution, preventing fastener loosening under vibration and extending the life of the entire assembly.

Specification Summary & Compliance

This flat washer is manufactured to precise metric dimensions with an inner diameter of 4.3mm, outer diameter of 9mm, and a thickness ranging from 0.7-0.9mm, designed specifically for M4 screw sizes. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances. It is rated for a maximum service temperature of 180°F.