S-90089A340 0.438" ID x 0.625" OD Plastic Washers

Key Features & Benefits at a Glance

• Superior Electrical Insulation: Hard fiber construction provides excellent non-conductive properties, preventing electrical current leakage in sensitive equipment.
• Optimal Load Distribution: Flat design with precise 0.625" OD and 0.438" ID ensures even pressure distribution, protecting surfaces from damage under 7/16" screw heads.
• Temperature Resilience: Maintains structural integrity in environments up to 230°F, ideal for applications with moderate thermal exposure.
• Chemical & Moisture Resistance: Gray hard fiber material offers inherent resistance to many industrial chemicals and humidity, extending service life.
• Regulatory Compliance Assurance: Meets RoHS 3 and REACH standards, ensuring safe use in global markets without hazardous substance restrictions.
• Precision Fit & Vibration Dampening: Tight 0.014-0.016" thickness tolerance provides secure seating and reduces noise/vibration in mechanical assemblies.
• Lightweight & Non-Abrasive: Fiber composition prevents galling on mating surfaces while reducing overall assembly weight versus metal alternatives.

Professional Applications & Engineering Value

These hard fiber flat washers deliver critical performance where electrical insulation and chemical resistance are paramount. The gray hard fiber construction solves common industrial pain points by preventing galvanic corrosion between dissimilar metals while providing dependable thermal stability up to 230°F. Engineers specify these inch system washers for electrical enclosures, HVAC systems, and machinery where 7/16" screws require reliable isolation from vibration and environmental factors. The precise 0.625" OD/0.438" ID dimensions ensure perfect alignment with standard fastener sizes, eliminating installation issues in high-volume assembly operations.

Specification Summary & Compliance

Manufactured to standard inch system dimensions with 0.625" outer diameter, 0.438" inner diameter, and controlled thickness between 0.014-0.016". These flat washers comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, containing no SVHCs above threshold limits as of June 2023. Suitable for applications requiring temperature resistance up to 230°F maximum.