S-90481A251 0.531" ID x 2.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through zinc plating protects against rust and extends service life in demanding environments
• Optimal load distribution with large 2.5" outer diameter prevents surface damage and maintains joint integrity under heavy loads
• Precise 0.531" inner diameter ensures perfect fit and alignment with 1/2" fasteners for secure assembly
• Durable zinc-plated steel construction provides reliable mechanical strength for industrial applications
• Comprehensive regulatory compliance with RoHS 3 and REACH standards meets global environmental and safety requirements
• Versatile inch system compatibility simplifies integration with existing equipment and North American specifications
• Consistent thickness control (0.051-0.080") ensures uniform pressure distribution and reliable performance

Professional Applications & Engineering Value

This zinc-plated steel flat washer delivers critical engineering solutions where corrosion resistance and load distribution are paramount. The zinc plating creates a protective barrier that significantly extends component life in humid, outdoor, or chemically exposed environments, reducing maintenance frequency and replacement costs. The substantial 2.5" outer diameter provides an expanded bearing surface that effectively distributes clamping force, preventing surface indentation and maintaining structural integrity in heavy-duty applications including construction equipment, industrial machinery, and structural steel connections. Engineered for 1/2" fasteners with precise 0.531" inner diameter, this flat washer ensures proper alignment and prevents bolt loosening due to vibration or dynamic loading, making it ideal for mechanical assemblies requiring reliable, long-term fastening performance.

Specification Summary & Compliance

This flat washer features a 0.531" inner diameter and 2.5" outer diameter with thickness ranging from 0.051" to 0.080", designed specifically for use with 1/2" fasteners in inch measurement systems. The product maintains dimensional accuracy suitable for standard industrial applications and is manufactured from zinc-plated steel for consistent performance. Compliance includes RoHS 3 (2015/863/EU) restriction of hazardous substances and REACH (EC 1907/2006) regulations regarding chemical safety, ensuring environmental responsibility and workplace safety standards are met.