S-90377A189 1.562" ID x 3.25" OD General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh industrial environments
• Optimal load distribution with a large 3.25" OD and 1.562" ID, reducing surface pressure and material stress
• Precision dimensional fit for 1 1/2" screw sizes, ensuring secure fastening and vibration resistance
• Enhanced durability with a thickness range of 0.100-0.180", providing reliable performance under heavy loads
• Regulatory compliance with RoHS 3 and REACH standards, ensuring safe, environmentally responsible manufacturing
• Versatile inch-system compatibility for seamless integration with existing industrial equipment and standards
• Long-term cost efficiency through reduced maintenance and replacement needs in demanding applications

Professional Applications & Engineering Value

This heavy-duty flat washer addresses critical engineering challenges in industrial settings where corrosion, vibration, and high loads compromise fastener integrity. The Black-Oxide 18-8 Stainless Steel construction provides exceptional resistance to rust and chemical exposure, making it ideal for outdoor machinery, marine equipment, and chemical processing plants. Its generous 3.25" OD effectively distributes clamping force over a wider area, preventing surface damage and joint loosening in structural assemblies, heavy equipment frames, and pipeline flanges. The precise 1.562" ID ensures perfect alignment with 1 1/2" screw sizes, maintaining bolt tension and reducing maintenance cycles. These features combine to deliver reliable performance in industrial washers applications where failure is not an option.

Specification Summary & Compliance

This flat washer meets inch-system dimensional standards with an inner diameter of 1.562", outer diameter of 3.25", and thickness range of 0.100-0.180". Manufactured from 18-8 Stainless Steel with black-oxide surface treatment, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. The washer is engineered for use with 1 1/2" screw sizes in various industrial fastening applications.