S-91138A832 0.531" ID x 1.375" OD ASME B18.21.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability with a wide operating range from -30°F to 450°F, ensuring reliable performance in extreme temperature environments
• Superior hardness and durability with Rockwell M114 rating, providing excellent resistance to wear and deformation under load
• Chemical and corrosion resistance inherent to Ultem PEI plastic, ideal for harsh industrial and chemical processing applications
• Precise dimensional fit with 0.531" ID and 1.375" OD, designed for accurate alignment and secure fastening with 1/2" screws
• Compliance with industry standards including ASME B18.21.1, ensuring consistent quality and interchangeability in mechanical assemblies
• Environmental and safety compliance with RoHS 3 and REACH regulations, making it safe for use in regulated industries
• Lightweight and non-conductive properties reducing overall assembly weight and eliminating risks of electrical shorts

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this Ultem PEI plastic flat washer solves critical challenges in high-temperature and corrosive environments. Its PEI material offers inherent flame resistance and low smoke emission, making it ideal for aerospace, automotive, and electrical enclosures where safety is paramount. The flat washer design distributes load evenly, preventing surface damage and loosening under vibration. With precise 1/2" screw size compatibility and ASME B18.21.1 conformity, it ensures reliable performance in assembly lines, chemical processing equipment, and high-heat machinery, reducing maintenance downtime and enhancing operational longevity.

Specification Summary & Compliance

This washer meets ASME B18.21.1 specifications for dimensional accuracy, with an ID of 0.531", OD of 1.375", and thickness ranging from 0.064" to 0.104". It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and health standards. Manufactured from Ultem PEI plastic in black color, it operates within a temperature range of -30°F to 450°F and features a hardness of Rockwell M114 for consistent performance in inch-system applications.