S-90089A420 1" ID x 1.25" OD Plastic Washers

Key Features & Benefits at a Glance

• Excellent electrical and thermal insulation due to hard fiber construction, preventing current leakage and heat transfer in sensitive assemblies
• Precise dimensional fit with 1" ID and 1.25" OD, ensuring reliable alignment and load distribution for #1 screw sizes
• Resilient performance under thermal stress, maintaining integrity in environments up to 230°F without deformation
• Consistent thickness control (0.014-0.016") for uniform pressure distribution and reduced bolt loosening in vibrating machinery
• Compliance with global environmental standards, including RoHS 3 and REACH, ensuring safe use in regulated industries
• Corrosion-resistant and non-conductive properties, ideal for electrical and plumbing applications where metal washers may fail
• Lightweight yet durable material that resists compression set, providing long-lasting sealing and spacing functions

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these hard fiber flat washers deliver reliable performance where electrical insulation, thermal resistance, and chemical stability are critical. The gray hard fiber material offers superior dielectric strength, making these washers ideal for electrical enclosures, control panels, and automotive systems where short-circuit prevention is paramount. With a precise 1" inner diameter and 1.25" outer diameter, they ensure optimal load distribution under #1 screws, reducing stress concentration and extending component life. The fiber construction naturally resists galvanic corrosion, eliminating compatibility issues in mixed-material assemblies. Commonly specified in plumbing, HVAC, and machinery applications, these washers maintain dimensional stability across temperature fluctuations up to 230°F, preventing gasket failure in heated environments.

Specification Summary & Compliance

This flat washer adheres to inch system dimensions with an inner diameter of 1", outer diameter of 1.25", and controlled thickness between 0.014-0.016" for consistent performance. Manufactured from hard fiber material in gray color, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring absence of restricted substances. While hardness is not rated, the washer is engineered for general-purpose industrial use with a maximum service temperature of 230°F, suitable for standard #1 screw sizes in mechanical and electrical assemblies.