S-91138A924 0.156" ID x 0.375" OD ASME B18.21.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability for reliable performance in extreme environments from -30°F to 450°F
• Superior hardness and durability with Rockwell M114 rating for extended service life under mechanical stress
• Precise dimensional compatibility with 0.156" ID and 0.375" OD ensuring perfect fit for No. 6 screws
• Compliance with industry standards including ASME B18.21.1 for consistent quality and interchangeability
• Chemical and environmental resistance thanks to Ultem PEI plastic construction for harsh industrial applications
• Regulatory compliance assurance with RoHS 3 and REACH certifications for safe global usage
• Versatile thickness range from 0.020" to 0.060" allowing optimal load distribution and gap filling

Professional Applications & Engineering Value

These Ultem PEI plastic flat washers deliver critical performance in demanding industrial settings where traditional metal washers fail. The high-temperature resistance (up to 450°F) makes them ideal for aerospace, automotive, and electronics applications involving thermal cycling. Their chemical inertness prevents corrosion in aggressive environments while maintaining dimensional stability. The inch-system dimensions and ASME B18.21.1 compliance ensure seamless integration with existing No. 6 screw assemblies, eliminating compatibility issues. Engineers benefit from reduced maintenance cycles and enhanced equipment reliability through the washer's Rockwell M114 hardness and consistent performance across extreme temperature ranges from -30°F to 450°F.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 specifications with precise inch-system dimensions: 0.156" ID, 0.375" OD, and thickness ranging 0.020"-0.060". These flat washers maintain dimensional integrity across the full operating temperature range while meeting RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements. The Ultem PEI material provides consistent performance with Rockwell M114 hardness rating, ensuring reliable operation in critical industrial applications where material specifications and regulatory compliance are paramount.