S-90481A201 0.281" ID x 1.625" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide steel finish, extending service life in harsh industrial environments.
• Optimal load distribution with a large 1.625" outer diameter, preventing surface damage and joint loosening.
• Precise fit for 1/4" screws with a 0.281" inner diameter, ensuring secure and stable fastening assembly.
• Consistent performance due to controlled thickness (0.124-0.145"), providing reliable spacing and vibration resistance.
• Environmental compliance assurance, meeting RoHS 3 and REACH standards for safe, global industrial use.
• Heavy-duty construction from steel material, offering high strength for demanding mechanical applications.
• Broad compatibility with inch-system components, simplifying sourcing and replacement in existing setups.

Professional Applications & Engineering Value

This black-oxide steel flat washer is engineered to address common industrial challenges such as corrosion-induced failure and uneven load distribution. The black-oxide surface treatment provides a durable barrier against moisture and chemicals, making it ideal for outdoor equipment, automotive assemblies, and machinery exposed to corrosive elements. Its precise 0.281" ID and 1.625" OD dimensions ensure a snug fit on 1/4" screws, reducing the risk of bolt loosening under vibration and thermal cycling. By evenly spreading clamp load, this washer minimizes stress concentrations on connected surfaces, thereby enhancing the longevity and reliability of heavy-duty fastening systems in construction, manufacturing, and maintenance operations.

Specification Summary & Compliance

This flat washer adheres to inch-system measurements with an inner diameter of 0.281", outer diameter of 1.625", and thickness ranging from 0.124" to 0.145". It is designed for use with 1/4" screws and manufactured from black-oxide coated steel for consistent performance. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for various industrial applications requiring environmental and safety standards.