S-90089A325 0.312" ID x 0.562" OD Plastic Washers

Key Features & Benefits at a Glance

• Superior electrical insulation properties provided by hard fiber material, preventing current leakage and short circuits in electrical assemblies
• Excellent vibration dampening capability to maintain fastener integrity and reduce noise in machinery applications
• High-temperature resistance up to 230°F ensures reliable performance in heated industrial environments
• Precision dimensional fit with 0.312" ID specifically engineered for 5/16" screws, ensuring proper alignment and distribution of load
• Enhanced chemical resistance of hard fiber material protects against corrosion from oils, solvents, and mild chemicals
• Regulatory compliance assurance with RoHS 3 and REACH standards for global market acceptance and environmental safety
• Cost-effective sealing solution that provides reliable gasketing while being more economical than metal alternatives

Professional Applications & Engineering Value

These hard fiber flat washers deliver critical engineering solutions across multiple industrial sectors. The gray hard fiber construction provides exceptional dielectric properties, making them ideal for electrical insulation applications where preventing current flow between metal components is paramount. In mechanical assemblies, their natural vibration resistance helps maintain bolt tension and prevents loosening under dynamic loads. The material's composition withstands temperatures up to 230°F, ensuring dimensional stability in heated environments common in automotive, appliance, and industrial equipment. With precise 0.312" inner diameter matching standard 5/16" screw sizes, these washers provide perfect fitment while distributing load evenly across surfaces, preventing damage to softer materials and maintaining joint integrity.

Specification Summary & Compliance

This flat hard fiber washer features precise dimensional specifications including 0.312" inner diameter, 0.562" outer diameter, and consistent thickness between 0.014-0.016". Manufactured to standard inch system measurements for compatibility with 5/16" screw applications. The product maintains full compliance with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory acceptance for industrial use across global markets. The hard fiber material provides consistent performance within the specified temperature range while meeting industry requirements for electrical insulation and mechanical protection applications.