S-91138A844 0.406" ID x 1" OD ASME B18.21.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability for reliable performance in environments ranging from -30°F to 450°F
• Superior chemical resistance thanks to Ultem PEI material, ideal for harsh industrial applications
• Enhanced durability and load distribution with Rockwell M114 hardness and precise flat washer design
• Guaranteed dimensional accuracy and interchangeability through compliance with ASME B18.21.1 standards
• Safe for regulated industries with full RoHS 3 and REACH compliance for environmental and health safety
• Optimal fit and function with 1" OD and 0.406" ID specifically designed for 3/8" screws in inch system applications
• Long-term reliability in high-stress conditions due to material integrity and consistent thickness (0.060-0.100")

Professional Applications & Engineering Value

Engineered for demanding environments, these Ultem PEI plastic flat washers address critical challenges in aerospace, chemical processing, and electronics where metal components fail. The high-temperature resistance prevents deformation under thermal cycling, while the chemical-resistant properties ensure longevity in corrosive settings. With a Rockwell M114 hardness and precise dimensions per ASME B18.21.1, they provide consistent load distribution and vibration resistance, reducing maintenance needs. The black color and inch system measurements make them easy to identify and integrate into existing assemblies, offering a reliable, non-conductive alternative to metal washers in extreme conditions.

Specification Summary & Compliance

This flat washer meets ASME B18.21.1 specifications for dimensional accuracy, with an OD of 1", ID of 0.406", and thickness range of 0.060-0.100". It is manufactured from Ultem PEI plastic in black and designed for use with 3/8" screws. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring adherence to environmental and safety regulations for industrial use.