S-91117A234 0.688" ID x 2.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for longer service life in harsh industrial environments
• Superior load distribution thanks to the large 2.5" outer diameter, preventing surface damage and joint loosening
• Precise fit for 5/8" screws with 0.688" inner diameter ensuring secure fastening and reduced vibration
• Consistent performance under pressure with Rockwell B40 hardness providing reliable mechanical strength
• Stable thickness tolerance (0.235-0.265") for uniform compression and predictable clamping force
• Full regulatory compliance with RoHS 3 and REACH standards for safe use in global industrial supply chains
• Heavy-duty durability in inch-system applications where robust flat washers are critical for structural integrity

Professional Applications & Engineering Value

This heavy-duty flat washer delivers exceptional engineering value through its zinc-plated steel construction and precise dimensional control. The combination of large OD (2.5") and controlled thickness (0.235-0.265") provides optimal surface coverage, effectively distributing clamp load across joined materials to prevent embedding, surface deformation, and joint fatigue. The Rockwell B40 hardness ensures the washer maintains its structural integrity under repeated loading cycles, while the zinc plating offers sacrificial corrosion protection in demanding environments. Ideal for construction equipment, industrial machinery, and structural steel applications where 5/8" screw size fasteners require reliable bearing surfaces, this washer solves common issues of joint relaxation and material damage in heavy-load scenarios.

Specification Summary & Compliance

Manufactured to inch system standards with precise dimensions: 0.688" ID, 2.5" OD, and thickness range of 0.235-0.265" specifically designed for 5/8" screw applications. The zinc-plated steel construction provides consistent performance with Rockwell B40 hardness rating. 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 (updated January 17, 2023, 233 SVHC) for industrial use in regulated markets.