S-90476A116 0.77" ID x 2" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 9 classification and Rockwell C43 hardness for reliable performance in demanding applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh industrial environments
• Precise dimensional compatibility with 3/4" screw size and 2" outer diameter ensuring proper fit and load distribution
• Heavy-duty construction with 0.136-0.160" thickness providing enhanced bearing surface and vibration resistance
• Industry-standard compliance meeting ASME B18.21.1 specifications for consistent quality and performance
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated applications
• Optimized for industrial use featuring inch system measurements compatible with standard USS fastener assemblies

Professional Applications & Engineering Value

This Grade 9 USS flat washer delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment where fastener failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion resistance in outdoor and chemically aggressive environments, while the Rockwell C43 hardness ensures the washer maintains its shape under extreme compressive loads. The precisely engineered dimensions (3/4" ID x 2" OD) create an optimal bearing surface that prevents embedment into softer materials and distributes clamping forces evenly. These industrial washers are specifically designed to address common challenges in construction, manufacturing, and infrastructure projects where vibration loosening, material degradation, and load distribution are critical concerns.

Specification Summary & Compliance

Manufactured to exacting ASME B18.21.1 standards, this USS flat washer maintains precise dimensional tolerances with 0.77" inner diameter, 2" outer diameter, and thickness ranging from 0.136" to 0.160". The Grade 9 classification ensures consistent high-strength performance, while the zinc yellow-chromate plating provides durable surface protection. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and safe use across various industrial sectors.