S-90108A041 1.625" ID x 3.5" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with large 3.5" OD surface area to prevent surface damage and fastener loosening under heavy loads
• Superior corrosion resistance through zinc-plated steel construction for extended service life in harsh industrial environments
• Precision dimensional accuracy with 1.625" ID ensuring perfect fit for 1 1/2" screws and reliable assembly performance
• Heavy-duty mechanical strength with 0.153-0.213" thickness providing robust support for demanding applications
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed quality and interchangeability
• Environmental responsibility with full RoHS 3 and REACH compliance for safe use across regulated industries
• Versatile USS designation optimized for general service applications requiring reliable load-bearing capability

Professional Applications & Engineering Value

This USS flat washer delivers critical engineering solutions where load distribution and corrosion resistance are paramount. The zinc-plated steel construction provides essential protection against environmental degradation, making it ideal for outdoor equipment, structural steel connections, and industrial machinery exposed to moisture or chemicals. With its substantial 3.5" outer diameter, the washer effectively distributes clamping force over a wider area, preventing surface indentation and maintaining joint integrity in heavy-duty applications. The precise 1.625" inner diameter ensures compatibility with 1 1/2" fasteners while the USS designation guarantees reliable performance in general service mechanical assemblies where vibration resistance and long-term stability are essential requirements.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 dimensional standards with inch system measurements: 1.625" ID, 3.5" OD, and thickness range of 0.153-0.213". The zinc-plated steel construction provides consistent performance while meeting critical compliance requirements including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. Designed specifically for use with 1 1/2" screw sizes, this USS flat washer delivers reliable dimensional accuracy and material consistency for industrial applications requiring standardized components.