S-90474A144 0.531" ID x 1.75" OD ASME Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance from the black-oxide steel finish, extending service life in demanding environments.
• Superior load distribution with a large 1.75" OD, minimizing surface pressure and preventing material damage.
• Precise fit and secure fastening ensured by the 0.531" ID, perfectly matching 1/2" screw sizes.
• Reliable mechanical strength with a Rockwell B80 hardness, providing consistent performance under stress.
• Durable construction from high-quality steel, offering excellent wear resistance for long-term use.
• Environmental compliance with RoHS 3 and REACH standards, ensuring safe and sustainable industrial use.
• Versatile thickness range (0.080-0.115") accommodates various assembly requirements and tolerances.

Professional Applications & Engineering Value

This black-oxide steel flat washer is engineered to address common industrial challenges such as fastener loosening, surface damage, and corrosion. The black-oxide surface treatment provides a protective layer that significantly reduces oxidation, making it ideal for applications in humid or chemically aggressive settings like outdoor machinery, automotive assemblies, and construction equipment. Its precise dimensions (0.531" ID for 1/2" screws and 1.75" OD) ensure optimal load distribution, preventing bolt head embedding and joint failure. By combining high hardness (Rockwell B80) with robust material integrity, this washer maintains clamping force and alignment in heavy-duty washers applications, reducing maintenance needs and enhancing operational reliability.

Specification Summary & Compliance

This flat washer features inch system dimensions with an inner diameter of 0.531", outer diameter of 1.75", and thickness ranging from 0.080" to 0.115", designed for use with 1/2" screws. It meets standard industrial requirements for fit and function, manufactured from black-oxide coated steel with a Rockwell B80 hardness for consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global supply chains.