S-91138A921 0.141" ID x 0.35" OD ASME B18.21.1 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
- Extreme temperature resilience for reliable performance from -30°F to 450°F, preventing deformation in harsh thermal environments
- Exceptional Rockwell M114 hardness ensures superior wear resistance and long service life under mechanical stress
- Precision-engineered dimensions (0.141" ID, 0.35" OD) provide optimal fit and load distribution for No. 5 screws
- ASME B18.21.1 compliance guarantees consistent quality and interchangeability in industrial assemblies
- RoHS 3 and REACH compliance meets stringent environmental regulations for safe use across global markets
- Ultem PEI material construction offers excellent chemical resistance and dimensional stability in corrosive conditions
- Consistent thickness tolerance (0.036-0.045") ensures uniform clamping force and vibration resistance
Professional Applications & Engineering Value
These Ultem PEI plastic flat washers solve critical engineering challenges in high-temperature and chemically aggressive environments. The PEI material's inherent thermal stability maintains structural integrity where metal washers would corrode or plastic alternatives would fail. With Rockwell M114 hardness, they withstand repeated assembly cycles without cracking or deforming, making them ideal for aerospace components, automotive systems, and electrical insulation applications. The ASME B18.21.1 specification ensures precise dimensional control for reliable performance in vibration-prone machinery and precision instrumentation, while the broad temperature range (-30°F to 450°F) accommodates thermal cycling in industrial processes.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 flat washer specifications with precise dimensional tolerances for No. 5 screw applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance. The Ultem PEI material delivers consistent performance across the specified temperature range while maintaining Rockwell M114 hardness for durable operation in demanding industrial settings.
