S-91138A838 0.25" ID x 0.562" 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
- Exceptional thermal stability for reliable performance in extreme environments from -30°F to 450°F
- Superior mechanical strength with Rockwell M114 hardness to withstand high-pressure industrial applications
- Precision dimensional compatibility with 0.25" ID and 0.562" OD ensuring perfect fit for No. 12 screws
- Industry-standard compliance meeting ASME B18.21.1 specifications for consistent quality and interchangeability
- Enhanced chemical resistance from Ultem PEI material preventing degradation in harsh operating conditions
- Regulatory compliance assurance with RoHS 3 and REACH compliance for global market accessibility
- Optimal load distribution through precise 0.051-0.080" thickness for improved joint integrity
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these Ultem PEI plastic flat washers deliver critical performance where thermal stability and chemical resistance are paramount. The high-temperature capability (450°F maximum) makes them ideal for aerospace, automotive, and electronics applications where conventional plastics would fail. The black Ultem PEI material maintains dimensional stability under thermal cycling, preventing loosening in vibration-prone assemblies. With precise 0.25" ID sizing for No. 12 screws, these washers provide consistent load distribution while the Rockwell M114 hardness ensures long-term reliability in high-stress applications. The combination of REACH and RoHS 3 compliance makes them suitable for regulated industries requiring environmentally conscious components.
Specification Summary & Compliance
These flat washers feature dimensional specifications of 0.25" inner diameter, 0.562" outer diameter, and thickness ranging 0.051-0.080" with manufacturing compliance to ASME B18.21.1 standards. The components maintain full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they meet current environmental and safety requirements for industrial applications worldwide.
