S-90108A419 2" ID x 4.25" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior load distribution with 4.25" outer diameter to prevent surface damage and material embedment
• Enhanced corrosion resistance through zinc-plated steel construction for extended service life in harsh environments
• Precise fitment with 2" inner diameter specifically engineered for 1 7/8" screw applications
• Reliable performance meeting ASME B18.21.1 standards for dimensional consistency and mechanical properties
• Environmental compliance with RoHS 3 and REACH regulations for safe industrial applications
• Optimal thickness range (0.153-0.213") providing consistent spacing and vibration resistance
• Heavy-duty construction suitable for high-stress applications in construction and mechanical assemblies

Professional Applications & Engineering Value

These USS flat washers deliver exceptional engineering value in demanding industrial environments where surface protection and load distribution are critical. The zinc-plated steel construction provides superior corrosion resistance, making these inch system washers ideal for outdoor construction, heavy machinery, and structural applications exposed to moisture and environmental stressors. With their substantial 4.25" outer diameter, these heavy-duty flat washers effectively distribute clamping forces over wider surface areas, preventing material deformation and maintaining joint integrity in high-vibration settings. The precise 2" inner diameter ensures perfect alignment with 1 7/8" fasteners, eliminating installation issues and reducing assembly time. Engineered to meet ASME B18.21.1 specifications, these mechanical washers provide reliable performance in critical load-bearing applications across construction, infrastructure, and industrial equipment sectors.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 dimensional standards with 2" inner diameter, 4.25" outer diameter, and thickness range of 0.153-0.213" for consistent performance. These USS flat washers are produced from zinc-plated steel and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications. The inch system measurement provides compatibility with standard North American fastener systems and equipment specifications.