S-91117A235 0.688" ID x 3" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance through zinc plating, extending service life in humid or outdoor industrial environments
• Exceptional load distribution with 3" outer diameter, preventing surface damage and maintaining joint integrity under heavy loads
• Precise 5/8" screw compatibility with 0.688" inner diameter, ensuring secure fit and reducing installation time
• Enhanced durability with Rockwell B40 hardness, resisting deformation under sustained mechanical stress
• Regulatory compliance assurance meeting RoHS 3 and REACH standards, enabling global sourcing for sensitive applications
• Consistent performance with 0.235-0.265" thickness tolerance, providing reliable sealing and spacing functions
• Heavy-duty construction using zinc-plated steel, offering optimal strength-to-weight ratio for demanding mechanical assemblies

Professional Applications & Engineering Value

This zinc-plated steel flat washer addresses critical engineering challenges in industrial equipment assembly, structural fastening systems, and heavy machinery maintenance. The zinc plating creates a sacrificial barrier against oxidation, significantly prolonging component life in corrosive environments where standard washers would degrade. With its 3" OD, the washer effectively distributes clamping forces across wider surfaces, preventing material crushing in soft substrates and maintaining bolt preload integrity in vibrating applications. The Rockwell B40 hardness ensures the washer maintains its flatness under extreme compression, eliminating the risk of embedding or permanent deformation that could compromise joint security. Engineered specifically for 5/8" screw applications in inch-system manufacturing, this component delivers reliable performance in construction, automotive, and industrial machinery where dimensional precision and corrosion resistance are paramount.

Specification Summary & Compliance

This flat washer maintains precise dimensional tolerances with 0.688" inner diameter, 3" outer diameter, and thickness ranging 0.235-0.265". Manufactured from zinc-plated steel with Rockwell B40 hardness, it complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations as of January 17, 2023. The inch-system measurement ensures compatibility with standard 5/8" screw fasteners for industrial applications requiring certified components.