S-98099A033 0.531" ID x 1.125" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from black-oxide steel surface treatment, extending service life in harsh industrial environments
• Precise dimensional compatibility with 0.531" ID perfectly matching 1/2" screw applications for secure fastening
• Optimal load distribution with 1.125" OD providing wider surface area to prevent material damage
• Consistent performance ensured by controlled thickness range of 0.168-0.193" for uniform pressure application
• Regulatory compliance with RoHS 3 and REACH standards for safe use in global industrial markets
• Durable steel construction offering reliable mechanical strength for heavy-duty applications
• Versatile inch system compatibility making them ideal for maintenance and replacement in existing inch-based assemblies

Professional Applications & Engineering Value

These black-oxide steel flat washers deliver exceptional engineering value through their specialized material properties and dimensional precision. The black-oxide surface treatment creates a protective barrier that significantly reduces oxidation and corrosion in demanding environments where moisture, chemicals, or temperature variations are concerns. With exact 0.531" inner diameter matching standard 1/2" screw sizes, these washers prevent loosening and maintain clamping force integrity in critical assemblies. The generous 1.125" outer diameter distributes load effectively across surfaces, protecting softer materials from indentation and damage. These characteristics make them particularly valuable for industrial machinery, construction equipment, automotive applications, and manufacturing fixtures where reliable flat washer performance directly impacts operational safety and maintenance intervals.

Specification Summary & Compliance

This flat washer features precise inch-system dimensions with 0.531" ID, 1.125" OD, and thickness ranging 0.168-0.193" for consistent performance in 1/2" screw applications. Manufactured from black-oxide steel for enhanced corrosion protection, these washers comply with RoHS 3 (2015/863/EU) standards under exemption 6(a) for lead as an alloying element in steel, and are fully REACH (EC 1907/2006) compliant with the latest SVHC requirements as of January 2023, ensuring regulatory acceptance for industrial and commercial use worldwide.