S-90481A204 0.438" ID x 2" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance from the black-oxide steel finish, extending service life in demanding environments.
• Optimal load distribution with a large 2" outer diameter, minimizing surface stress and preventing material damage.
• Precise fit for 3/8" screws with a 0.438" inner diameter, ensuring secure fastening and reducing assembly errors.
• Durable and reliable performance due to the robust steel material, suitable for high-vibration and heavy-duty applications.
• Consistent thickness control between 0.060" and 0.090", providing uniform pressure and improved joint stability.
• Compliance with environmental standards, meeting RoHS 3 and REACH regulations for safe and sustainable usage.
• Broad industrial compatibility with inch-system components, simplifying sourcing and integration into existing assemblies.

Professional Applications & Engineering Value

This black-oxide steel flat washer is engineered to address common industrial challenges such as fastener loosening, surface abrasion, and corrosion-induced failure. The black-oxide coating provides a protective layer that significantly reduces oxidation, making it ideal for applications exposed to moisture, chemicals, or outdoor conditions. Its generous 2" OD effectively disperses clamping force over a wider area, protecting soft materials and reducing the risk of bolt pull-through in structural assemblies. Designed for use with 3/8" screws in inch-based systems, it ensures precise alignment and secure fastening in machinery, automotive, construction, and heavy equipment. By combining material durability with dimensional accuracy, this washer enhances the longevity and reliability of industrial fastening systems, minimizing maintenance needs and downtime.

Specification Summary & Compliance

This flat washer adheres to standard inch-system dimensions with an inner diameter of 0.438", outer diameter of 2", and thickness ranging from 0.060" to 0.090". It is manufactured from high-quality steel with a black-oxide surface treatment for improved corrosion protection. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for hazardous substances.