S-98029A050 0.531" ID x 1.375" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through black-oxide steel surface treatment, extending service life in demanding industrial environments
• Precise dimensional compatibility with 1/2" fasteners thanks to 0.531" inner diameter, ensuring secure fit and proper load distribution
• Optimal surface coverage with 1.375" outer diameter, providing superior bearing surface and preventing joint loosening
• Consistent performance maintained through controlled 0.146-0.166" thickness range for uniform pressure distribution
• Regulatory compliance assurance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications for global market acceptance
• Durable steel construction offering reliable strength and longevity in mechanical assemblies
• Inch system standardization ensuring seamless integration with existing industrial equipment and replacement parts

Professional Applications & Engineering Value

This black-oxide steel flat washer delivers exceptional engineering value in industrial settings where corrosion resistance and dimensional precision are critical. The black-oxide surface treatment creates a protective barrier against moisture and environmental factors, significantly reducing oxidation in harsh operating conditions. Engineered for 1/2" fastener systems, the precise 0.531" inner diameter ensures perfect alignment with mating components, eliminating misalignment issues that can compromise assembly integrity. The generous 1.375" outer diameter provides optimal load distribution across wider surfaces, preventing surface damage to connected materials while maintaining joint stability under vibration and dynamic loads. These industrial washers are particularly valuable in machinery assembly, automotive applications, and construction projects where reliable performance and regulatory compliance are non-negotiable requirements for B2B procurement decisions.

Specification Summary & Compliance

This flat washer features inch system dimensions with 0.531" inner diameter, 1.375" outer diameter, and thickness ranging from 0.146" to 0.166" for consistent performance. Manufactured from black-oxide steel, the product maintains compliance with RoHS 3 (2015/863/EU) standards under exemption 6(a) for lead as an alloying element in steel, and meets REACH (EC 1907/2006) requirements as of January 17, 2023, addressing 233 Substances of Very High Concern. The washer is specifically designed for use with 1/2" screws in industrial and mechanical applications requiring reliable fastening solutions.