S-91117A231 0.688" ID x 2.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Exceptional load distribution with 2.5" outer diameter, preventing surface damage and maintaining joint integrity
• Precision fit for 5/8" screws with 0.688" inner diameter, ensuring secure fastening and reducing installation errors
• Enhanced durability with Rockwell B40 hardness, providing reliable performance under repeated stress
• Consistent thickness control (0.110-0.140") for uniform pressure distribution and stable assembly performance
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring safe use in global industrial applications
• Heavy-duty steel construction offering excellent strength-to-weight ratio for demanding mechanical applications

Professional Applications & Engineering Value

This zinc-plated steel flat washer delivers critical engineering solutions for industrial assembly challenges. The corrosion-resistant zinc plating protects against environmental degradation in outdoor equipment, manufacturing machinery, and structural applications. With its substantial 2.5" outer diameter, this heavy-duty flat washer effectively distributes clamping force over a wider surface area, preventing material deformation and maintaining bolt preload in high-vibration environments. The precise 0.688" inner diameter ensures perfect alignment with 5/8" screws, reducing installation time and eliminating fastener slippage. Engineered for industrial washers applications requiring reliable performance, this component addresses common failure points in mechanical systems while meeting stringent industry standards for quality and safety.

Specification Summary & Compliance

This flat washer maintains precise dimensional tolerances with inner diameter of 0.688", outer diameter of 2.5", and thickness range of 0.110-0.140". Manufactured from zinc-plated steel with Rockwell B40 hardness, it provides consistent mechanical properties. 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 current as of January 17, 2023, covering 233 Substances of Very High Concern. Designed for use with 5/8" screw size in inch measurement system applications.