S-90108A046 2.125" ID x 4.5" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior load distribution with large 4.5" outer diameter to prevent surface damage and fastener loosening under heavy loads
• Enhanced corrosion resistance through zinc-plated steel construction for extended service life in harsh environments
• Precise compatibility with 2" screws thanks to accurate 2.125" inner diameter manufacturing
• Reliable industrial performance backed by ASME B18.21.1 specification compliance for consistent quality
• Environmental compliance assurance with RoHS 3 and REACH conformity for global supply chain integration
• Durable material strength from zinc-plated steel construction that maintains integrity under sustained pressure
• Versatile installation with standard USS flat washer profile suitable for various industrial assembly applications

Professional Applications & Engineering Value

This USS flat washer delivers critical engineering solutions for heavy-duty applications where proper load distribution is paramount. The zinc-plated steel construction provides essential corrosion resistance in industrial environments exposed to moisture, chemicals, or outdoor conditions. With its substantial 4.5" outer diameter, this industrial-grade washer effectively disperses clamping force over a wider surface area, preventing material deformation and maintaining joint integrity in structural connections, machinery assemblies, and construction applications. The precise 2.125" inner diameter ensures perfect fitment with 2" fasteners, eliminating play and maintaining alignment in high-vibration environments. Engineered to ASME B18.21.1 standards, this flat washer offers reliable performance in critical load-bearing applications across manufacturing, infrastructure, and heavy equipment sectors.

Specification Summary & Compliance

This USS flat washer features dimensional specifications of 2.125" inner diameter and 4.5" outer diameter with thickness ranging 0.153-0.213". Manufactured from zinc-plated steel, the washer conforms to ASME B18.21.1 standards for dimensional accuracy and performance requirements. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and chemical safety in industrial applications. Designed specifically for use with 2" fasteners in inch measurement systems, this flat washer delivers reliable performance in demanding industrial settings.