S-98970A225 1.375" ID x 4" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion protection with hot-dipped galvanized steel coating for extended service life in harsh environments
• Exceptional load distribution across 4" outer diameter to prevent surface damage and joint loosening
• Precise 1.375" inner diameter ensures perfect fit for 1 1/4" screws without installation issues
• Consistent thickness control (0.485-0.515") maintains uniform pressure distribution in assembled joints
• Reliable mechanical strength with Rockwell B40 hardness for durable performance under heavy loads
• Full regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications
• Heavy-duty construction designed to withstand extreme conditions in structural and machinery applications

Professional Applications & Engineering Value

This hot-dipped galvanized steel flat washer delivers critical engineering solutions for industrial applications where corrosion resistance and structural integrity are paramount. The thick zinc coating provides superior protection against rust and environmental degradation, making it ideal for outdoor structures, marine environments, and chemical processing facilities. With its substantial 4" outer diameter, this heavy-duty washer effectively distributes clamping forces over larger surface areas, preventing material deformation and maintaining bolt tension in high-vibration applications. The precise 1.375" inner diameter ensures perfect alignment with 1 1/4" fasteners, eliminating installation errors and reducing assembly time. Engineered for industrial washers requirements, this component maintains joint integrity in construction equipment, bridge structures, and heavy machinery where reliability cannot be compromised.

Specification Summary & Compliance

This flat washer features inch system dimensions with 1.375" inner diameter, 4" outer diameter, and controlled thickness range of 0.485-0.515". Manufactured from hot-dipped galvanized steel with Rockwell B40 hardness rating, it's designed specifically for 1 1/4" screw size applications. The product maintains full compliance 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 to 233 SVHC as of January 17, 2023, ensuring environmental responsibility and global market acceptance.