S-90850A170 1.572" ID x 2.78" OD General Purpose Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with a 2.78" outer diameter and 1.572" inner diameter, preventing surface damage and loosening under high stress.
• Superior corrosion resistance from zinc yellow-chromate plating, ensuring long-term reliability in harsh industrial environments.
• High-strength performance with Grade 9 classification and Rockwell C40 hardness, offering reliable service in demanding applications.
• Precise fit for 1 1/2" screws, reducing installation time and ensuring secure fastening in inch-system assemblies.
• Enhanced durability through robust steel construction, minimizing wear and extending the lifespan of your equipment.
• Compliance with environmental standards including REACH, providing peace of mind for regulated industries.
• Consistent thickness (0.234-0.266") for uniform pressure distribution and improved joint integrity.

Professional Applications & Engineering Value

This Grade 9 SAE flat washer is engineered to address critical challenges in heavy-duty industrial settings, such as vibration-induced loosening and corrosion in machinery. Made from zinc yellow-chromate plated steel, it combats rust effectively, making it ideal for outdoor equipment, construction machinery, and automotive assemblies exposed to moisture. The SAE designation and precise dimensions (1.572" ID x 2.78" OD) ensure compatibility with standard 1 1/2" screw sizes, simplifying procurement and reducing downtime. Its high Rockwell C40 hardness and Grade 9 strength provide reliable performance under extreme loads, preventing fastener failure in applications like structural bolting and industrial maintenance, thereby enhancing safety and operational efficiency.

Specification Summary & Compliance

This washer adheres to SAE standards with precise dimensional tolerances, including an inner diameter of 1.572", outer diameter of 2.78", and thickness ranging from 0.234" to 0.266". It is manufactured from zinc yellow-chromate plated steel with a Rockwell C40 hardness and meets Grade 9 for high-strength requirements. Compliance includes REACH (EC 1907/2006) regulations, ensuring it is free from harmful substances as of the latest update, supporting use in environmentally conscious industries.