S-98970A316 2" ID x 4.25" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel construction, ideal for outdoor and harsh industrial environments
• Heavy-duty load distribution thanks to the large 4.25" outer diameter, reducing surface pressure and preventing material damage
• Precise fit for 1 7/8" screws with 2" inner diameter, ensuring secure fastening and alignment in demanding applications
• Enhanced durability from robust steel material and 0.153-0.213" thickness, providing long-term reliability under stress
• Industry-standard compliance with ASME B18.21.1, guaranteeing consistent quality and interchangeability
• Environmental and safety adherence through RoHS 3 compliance, meeting strict regulatory requirements for hazardous substances
• Versatile inch system compatibility for seamless integration with existing USS-standard equipment and components

Professional Applications & Engineering Value

This USS flat washer is engineered to address critical challenges in heavy machinery, construction, and infrastructure projects where corrosion and mechanical stress are prevalent. The hot-dipped galvanized steel material provides a thick, uniform zinc coating that effectively shields against rust and weathering, extending service life in exposed settings like bridges, marine equipment, and agricultural machinery. Its large OD and precise ID ensure optimal load distribution and secure seating for 1 7/8" screw fasteners, preventing loosening under vibration and reducing the risk of joint failure. By conforming to ASME B18.21.1, this washer delivers reliable performance in high-torque applications, making it a trusted component for engineers and maintenance teams seeking durability and compliance in industrial fastening systems.

Specification Summary & Compliance

This USS flat washer features dimensions of 2" inner diameter, 4.25" outer diameter, and thickness ranging from 0.153" to 0.213", designed for use with 1 7/8" screws in inch measurement systems. It is manufactured from hot-dipped galvanized steel and complies with the ASME B18.21.1 standard for dimensional and mechanical requirements. The product is RoHS 3 (2015/863/EU) Compliant, ensuring it meets environmental regulations for restricted substances.