S-99872A117 0.59" ID x 0.866" OD Plastic Washers

Key Features & Benefits at a Glance

• Exceptional Temperature Resilience: Maintains structural integrity across a wide operating range from -20°F to 230°F, ensuring reliable performance in fluctuating thermal environments.
• Superior Chemical & Corrosion Resistance: Made from glass-filled nylon, this washer withstands exposure to harsh chemicals and prevents galvanic corrosion, extending equipment lifespan.
• High Mechanical Strength & Durability: Reinforced with a Rockwell M96 hardness rating, it resists deformation under load for consistent clamping force and vibration resistance.
• Precision Fit for Secure Fastening: With a 0.59" ID and 0.866" OD, it ensures optimal alignment and load distribution for 9/16" screws, reducing assembly failures.
• Regulatory Compliance for Global Supply Chains: Fully compliant with RoHS 3 and REACH standards, meeting stringent environmental and safety regulations.
• Lightweight & Non-Conductive Properties: The nylon plastic construction reduces overall weight and provides electrical insulation, ideal for sensitive electronic or automotive assemblies.
• Dimensional Consistency: Manufactured to precise inch system specifications (Thickness: 0.057-0.067"), ensuring uniform performance in high-volume production runs.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this glass-filled nylon flat washer solves critical challenges in applications where metal fasteners fall short. Its high-temperature resistance (up to 230°F) makes it suitable for automotive engine compartments, HVAC systems, and electrical enclosures exposed to heat cycling. The material's inherent chemical resistance prevents degradation in environments with oils, solvents, or moisture, common in chemical processing and marine equipment. By eliminating the risk of galvanic corrosion between dissimilar metals, it ensures long-term reliability in assemblies combining steel screws with aluminum or composite structures. The off-white color allows for easy identification and quality control in automated production lines, while its consistent dimensions (0.866" OD, 0.59" ID) provide secure seating for 9/16" screws, distributing load effectively to prevent joint loosening under vibration.

Specification Summary & Compliance

This flat washer adheres to inch system measurement standards with an Inside Diameter (ID) of 0.59", Outside Diameter (OD) of 0.866", and Thickness ranging from 0.057" to 0.067". It is designed for use with 9/16" screw size and manufactured from glass-filled nylon plastic with a hardness of Rockwell M96. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets the latest environmental and health safety standards for industrial components.