S-98594A412 4.3 mm ID x 9 mm OD Plastic Washers

Key Features & Benefits at a Glance

• Excellent Chemical Resistance: Made from durable Polypropylene Plastic, these washers resist corrosion from oils, solvents, and many chemicals, ensuring long-term reliability in harsh industrial environments.
• Consistent Load Distribution: The flat design with precise 4.3mm ID and 9mm OD helps distribute pressure evenly, preventing surface damage and loosening of M4 screws under vibration or load.
• High-Temperature Suitability: Withstands temperatures up to 150°F, making them ideal for applications where thermal stability is required without compromising performance.
• Superior Electrical Insulation: Polypropylene material provides excellent non-conductive properties, protecting against electrical shorts in sensitive electronic or machinery assemblies.
• Lightweight and Non-Abrasive: The plastic construction reduces overall weight and prevents scratching or galvanic corrosion when used with dissimilar metals, extending component life.
• Regulatory Compliance Assurance: Fully compliant with RoHS 3 and REACH standards, ensuring safe use in regulated industries and global market acceptance.
• Cost-Effective Durability: Offers Rockwell R100 hardness for reliable wear resistance, reducing replacement frequency and maintenance costs in repetitive or high-use scenarios.

Professional Applications & Engineering Value

These M4 metric flat washers are engineered from Polypropylene Plastic to address common industrial challenges such as corrosion, electrical isolation, and weight reduction. The off-white color allows for easy identification and quality checks in assembly lines. Ideal for use in electrical enclosures, automotive components, and food processing equipment, they prevent galvanic corrosion between dissimilar metals and provide reliable insulation. With a maximum temperature resistance of 150°F, they maintain integrity in environments with moderate heat exposure, while the precise inner and outer diameters (4.3mm ID, 9mm OD) ensure a secure fit for M4 screws, reducing the risk of assembly errors and enhancing overall system longevity.

Specification Summary & Compliance

This flat washer meets metric system standards with an ID of 4.3mm, OD of 9mm, and thickness ranging from 0.7-1.0 mm, designed for M4 screw sizes. Manufactured from Polypropylene Plastic with a hardness of Rockwell R100, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for industrial applications requiring strict adherence to global directives.