S-93550A130 2.625" ID x 4.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance from the black-oxide steel finish, extending service life in harsh industrial environments
• Optimal load distribution with a large 4.5" outer diameter, minimizing surface pressure and preventing material damage
• Precise compatibility with 2 1/2" screws thanks to the 2.625" inner diameter, ensuring secure fastening and vibration resistance
• Durable construction with consistent 0.298-0.328" thickness for reliable performance under heavy loads
• Regulatory compliance with RoHS 3 and REACH standards, meeting international environmental and safety requirements
• Versatile inch-system sizing for seamless integration with existing industrial equipment and North American specifications

Professional Applications & Engineering Value

This black-oxide steel flat washer delivers critical engineering value in demanding applications where corrosion resistance and load distribution are paramount. The black-oxide surface treatment provides a protective barrier against moisture and chemicals, significantly reducing oxidation in industrial, construction, and outdoor settings. Its generous 4.5" OD and precise 2.625" ID work synergistically to distribute clamping forces effectively across wider surfaces, preventing joint loosening from vibration and minimizing surface deformation on softer materials. Engineered specifically for 2 1/2" screw applications, this heavy-duty flat washer solves common fastener failure points in structural steelwork, heavy machinery assembly, and infrastructure projects where reliability cannot be compromised.

Specification Summary & Compliance

This flat washer features inch-system dimensions with 2.625" inner diameter, 4.5" outer diameter, and 0.298-0.328" thickness range for precision fit with 2 1/2" screws. Manufactured from black-oxide coated steel for enhanced durability, the product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations as of January 17, 2023, meeting the latest environmental and safety standards for industrial components.