S-91117A225 0.531" ID x 2" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
• Enhanced load distribution from the 2" OD design, preventing surface damage and fastener loosening
• Precise fit for 1/2" screws with 0.531" ID, ensuring secure fastening and reduced vibration
• Durable construction with Rockwell B40 hardness, offering reliable performance under heavy loads
• Regulatory compliance with RoHS 3 and REACH, meeting strict environmental and safety standards
• Versatile inch system compatibility for seamless integration into existing industrial assemblies
• Consistent thickness tolerance (0.110-0.140") for uniform pressure application and easy installation

Professional Applications & Engineering Value

This zinc-plated steel flat washer is engineered to address common industrial challenges like corrosion-induced failure and uneven load distribution. The zinc plating provides a protective barrier against moisture and chemicals, making it ideal for outdoor equipment, machinery, and construction applications. With its 2" OD and Rockwell B40 hardness, it effectively spreads pressure over a wider area, reducing stress on connected materials and minimizing the risk of bolt loosening in high-vibration settings. Designed for 1/2" screws in inch system assemblies, it ensures precise alignment and reliable performance in heavy-duty fastening tasks, from structural steelwork to automotive manufacturing.

Specification Summary & Compliance

This flat washer features an ID of 0.531", OD of 2", and thickness range of 0.110-0.140" for use with 1/2" screws, manufactured from zinc-plated steel with Rockwell B40 hardness. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial components.