S-93785A815 0.28" ID x 0.63" OD ASME B18.21.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional heat resistance maintains structural integrity and performance in extreme environments up to 500°F, preventing deformation under thermal stress.
• Superior chemical resistance ensures long-term durability when exposed to harsh industrial chemicals, solvents, and corrosive agents.
• Precision dimensional stability with 0.28" ID and 0.63" OD provides consistent fit and reliable load distribution for 1/4" fasteners.
• High mechanical strength with Rockwell M103 hardness offers excellent wear resistance and maintains shape under heavy clamping loads.
• Compliance with ASME B18.21.1 standard guarantees interchangeability, quality, and reliability in demanding mechanical assemblies.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance for global industrial applications.
• Versatile thickness range (0.040-0.080") allows for precise gap filling and tension adjustment in various assembly configurations.

Professional Applications & Engineering Value

This PEEK plastic flat washer delivers critical engineering solutions where standard metal washers fail. Its high-temperature capability up to 500°F makes it ideal for aerospace, automotive, and chemical processing equipment where thermal cycling is common. The black PEEK material provides outstanding chemical resistance against oils, fuels, and aggressive solvents, preventing degradation in corrosive environments. With its 1/4" screw size compatibility and ASME B18.21.1 compliance, this washer ensures precise fit and reliable performance in precision assemblies, electrical insulation applications, and food processing machinery where non-metallic components are essential. The combination of Rockwell M103 hardness and dimensional stability prevents compression set, maintaining clamping force in vibrating systems and heavy-duty industrial equipment.

Specification Summary & Compliance

This flat washer features precision dimensions with 0.28" ID, 0.63" OD, and thickness range of 0.040-0.080" for 1/4" fasteners. Manufactured to ASME B18.21.1 specifications for dimensional accuracy and performance consistency. The washer demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance. With a temperature range of -20°F to 500°F and Rockwell M103 hardness, it meets rigorous industrial requirements for thermal stability and mechanical durability in inch system applications.