S-90313A264 0.281" ID x 3.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional load distribution with a large 3.5" outer diameter, minimizing surface pressure and material stress
• Precise fit for 1/4" screws with 0.281" inner diameter, ensuring secure fastening and reduced vibration loosening
• Enhanced durability from a 0.122-0.145" thickness, providing reliable, long-lasting performance under heavy loads
• Compliance with strict environmental standards, including RoHS 3 and REACH, for safe use in regulated industries
• Broad compatibility with inch-system components, simplifying sourcing and assembly in North American markets
• Cost-effective maintenance due to stainless steel's longevity, reducing replacement frequency and downtime

Professional Applications & Engineering Value

This heavy-duty flat washer is engineered to address common industrial challenges like corrosion-induced failure and uneven load distribution. Made from 18-8 stainless steel, it offers excellent resistance to rust and chemicals, making it suitable for outdoor, marine, or chemical processing applications. The large 3.5" OD and precise 0.281" ID ensure optimal force dispersion and secure fit on 1/4" screws, preventing joint loosening in high-vibration settings like machinery, construction, and automotive assemblies. Its robust inch-system design and corrosion-resistant properties reduce maintenance costs and enhance the reliability of industrial fastening solutions, supporting long-term operational efficiency.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.281", outer diameter of 3.5", and thickness range of 0.122-0.145", designed for use with 1/4" screw sizes in inch measurement systems. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial components. The washer is manufactured from 18-8 stainless steel, providing consistent performance without a rated hardness specification, and is ideal for applications requiring reliable, compliant fasteners.