S-90476A115 0.641" ID x 1.75" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with 1.75" OD and 0.641" ID for superior surface coverage and reduced material stress
• Maximum corrosion resistance through zinc yellow-chromate plating, ideal for harsh industrial environments
• Superior mechanical strength with Rockwell C43 hardness for reliable performance under heavy loads
• Industry-standard compliance with ASME B18.21.1 specifications ensuring consistent quality and interchangeability
• Enhanced safety and durability from Grade 9 classification, providing high tensile strength for critical applications
• Environmental responsibility with full RoHS 3 and REACH compliance, meeting strict regulatory requirements
• Precision dimensional control with thickness ranging 0.136-0.160" for optimal compression and vibration resistance

Professional Applications & Engineering Value

These Grade 9 USS flat washers deliver exceptional engineering value in demanding industrial settings where fastener failure is not an option. The zinc yellow-chromate plated steel construction provides a robust barrier against corrosion, significantly extending service life in outdoor, chemical, and high-moisture environments. With their 5/8" screw size compatibility and substantial outer diameter, these washers effectively distribute clamping forces across wider surfaces, preventing joint loosening and material deformation in heavy machinery, structural steel connections, and industrial equipment assemblies. The combination of Rockwell C43 hardness and precise dimensional tolerances ensures consistent performance in high-vibration applications, making them ideal for construction, manufacturing, and transportation industries where reliability is paramount.

Specification Summary & Compliance

Manufactured to exacting ASME B18.21.1 standards, these USS flat washers maintain precise dimensional control with 0.641" inner diameter, 1.75" outer diameter, and thickness ranging from 0.136" to 0.160". The Grade 9 classification ensures superior mechanical properties and load-bearing capacity. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and regulatory adherence for global industrial applications.