S-93785A807 0.125" ID x 0.313" OD ASME B18.21.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability maintains performance across a wide temperature range from -20°F to 500°F, preventing deformation in extreme environments
• Superior dimensional integrity with 30% carbon filler reinforcement ensures consistent flatness and prevents compression under heavy loads
• Enhanced durability with Rockwell M103 hardness rating provides excellent wear resistance and extended service life
• Precision engineering with 0.125" ID and 0.313" OD ensures perfect fit for No. 4 screws, reducing installation time and improving assembly accuracy
• Chemical and corrosion resistance of carbon-filled PEEK material protects against degradation in harsh industrial environments
• Regulatory compliance with RoHS 3 and REACH standards ensures environmental safety and global market acceptance
• Reduced maintenance requirements through excellent material properties that resist creep and relaxation under sustained loads

Professional Applications & Engineering Value

These carbon-filled PEEK flat washers deliver critical performance advantages in demanding industrial settings where conventional metal washers fail. The 30% carbon filler material significantly enhances the polymer's structural integrity, making these black washers ideal for applications requiring electrical insulation, chemical resistance, and weight reduction without sacrificing strength. Engineered to ASME B18.21.1 specifications, they provide reliable load distribution for No. 4 screw size fastening systems in aerospace, automotive, and semiconductor manufacturing equipment. The material's low coefficient of thermal expansion ensures dimensional stability across the entire -20°F to 500°F operating range, preventing loosening in thermal cycling environments while offering excellent resistance to creep and stress relaxation under sustained clamping forces.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 standards with precise dimensional tolerances, these flat washers feature 0.125" inner diameter and 0.313" outer diameter with thickness ranging from 0.025" to 0.040". The inch system measurement ensures compatibility with standard industrial components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and unrestricted use in global markets. The carbon-filled PEEK construction meets rigorous material specifications with 30% filler content and Rockwell M103 hardness rating for consistent performance in critical applications.