S-90295A237 0.188" ID x 0.625" OD ASME B18.22.1 Plastic Washers
Plastic Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Temperature & Environment Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Excellent chemical and corrosion resistance due to nylon plastic construction, ideal for harsh industrial environments.
- Reliable electrical insulation properties for safe use in electrical assemblies and sensitive equipment.
- Wide operating temperature range from -40°F to 300°F, ensuring consistent performance under extreme thermal conditions.
- Superior durability and wear resistance with Rockwell R115 hardness, extending service life in high-vibration applications.
- Precise dimensional fit with 0.188" ID and 0.625" OD, designed specifically for No. 8 screws to prevent loosening.
- Full compliance with industry standards including ASME B18.22.1, ensuring interchangeability and quality in manufacturing.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.
Professional Applications & Engineering Value
This nylon plastic flat washer is engineered to address common industrial challenges such as galvanic corrosion, electrical conductivity, and thermal expansion in metal assemblies. Its non-conductive properties make it ideal for electrical enclosures, control panels, and automotive electronics where insulation is critical. The green color provides easy identification in complex assemblies, while the nylon material offers inherent resistance to fuels, oils, and many solvents, reducing maintenance in chemical processing and marine applications. With a temperature range of -40°F to 300°F, it maintains dimensional stability in outdoor equipment, HVAC systems, and automotive components exposed to seasonal temperature fluctuations, ensuring long-term fastener reliability without degradation.
Specification Summary & Compliance
This flat washer features precise inch dimensions with 0.188" inner diameter and 0.625" outer diameter, specifically designed for No. 8 screw size applications. Manufactured to ASME B18.22.1 specifications for dimensional consistency and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, containing no substances of very high concern above threshold limits. Material hardness is certified at Rockwell R115 for consistent performance across the specified temperature range.
