S-98025A040 1.375" ID x 2.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Exceptional strength and load distribution with Grade 8 classification, ideal for high-stress industrial assemblies
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Precise dimensional fit with 1.375" ID and 2.5" OD, ensuring reliable performance with 1 1/4" screws
• Enhanced durability and wear resistance from Rockwell C43 hardness, maintaining integrity under repeated loads
• Heavy-duty construction with 0.235-0.264" thickness for superior vibration resistance and joint stability
• Compliance with international regulations including RoHS 3 and REACH, ensuring safe and sustainable usage
• Broad compatibility with inch system components, simplifying sourcing for North American industrial applications

Professional Applications & Engineering Value

This Grade 8 flat washer delivers critical engineering value in heavy machinery, construction equipment, and structural steel applications where vibration resistance and load distribution are paramount. The zinc yellow-chromate plated steel construction provides a robust barrier against rust and chemical exposure, addressing common failure points in outdoor or corrosive industrial environments. With its Rockwell C43 hardness and substantial thickness, it prevents embedding and maintains clamping force in high-torque assemblies. The precise 1.375" ID and 2.5" OD dimensions ensure optimal surface contact for 1 1/4" screws, making it an essential component for critical bolted connections in infrastructure, transportation, and manufacturing equipment where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to inch system standards with precise dimensional tolerances, this flat washer features Grade 8 strength classification for high-performance applications. The product maintains compliance with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and is fully REACH (EC 1907/2006) compliant with the latest SVHC updates. The zinc yellow-chromate plating provides consistent surface protection while meeting industrial fastener specifications for corrosion resistance and durability.