S-91225A312 3.7 mm ID x 7.8 mm OD Plastic Washers

Key Features & Benefits at a Glance

• Exceptional Heat Resistance – Withstands continuous temperatures up to 250°F, ensuring reliable performance in high-heat industrial applications.
• Superior Hardness & Durability – Rockwell M105 hardness rating provides excellent wear resistance and long service life under mechanical stress.
• Effective Electrical Insulation – Made from phenolic plastic, offering reliable insulation properties for electrical and electronic assemblies.
• Precise Metric Sizing – 3.7mm ID and 7.8mm OD ensure accurate fit with M3.5 screws, reducing installation errors and improving assembly efficiency.
• Consistent Thickness Control – 0.4-0.6mm thickness range guarantees uniform load distribution and vibration dampening in fastened joints.
• Full Regulatory Compliance – Meets RoHS 3 and REACH standards, ensuring safety and environmental responsibility for global supply chains.
• Chemical & Moisture Resistance – Phenolic material inherently resists oils, solvents, and humidity, maintaining integrity in harsh conditions.

Professional Applications & Engineering Value

This phenolic plastic flat washer is engineered to address critical challenges in high-temperature and electrically sensitive environments. Its phenolic plastic construction delivers outstanding thermal stability up to 250°F, preventing deformation or failure in applications like motor mounts, electronic enclosures, and automotive components. The material’s natural electrical insulation properties eliminate short-circuit risks, while the metric design (3.7mm ID for M3.5 screws) ensures precise alignment and secure fastening. Ideal for industries requiring heat-resistant and non-conductive washers, it enhances safety and longevity in appliances, power systems, and industrial machinery where thermal management and insulation are paramount.

Specification Summary & Compliance

This flat washer conforms to standard metric dimensions: Inner Diameter 3.7mm, Outer Diameter 7.8mm, and Thickness 0.4-0.6mm, suitable for M3.5 screw applications. It is manufactured from phenolic plastic with a hardness of Rockwell M105 and a maximum operating temperature of 250°F. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to strict environmental and safety standards for industrial use.