S-90108A173 0.438" ID x 1" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Optimal load distribution with 1" OD and 0.438" ID dimensions, preventing surface damage and maintaining joint integrity
• Enhanced mechanical strength with Grade 5 classification, providing reliable performance under high-stress applications
• Precise dimensional compliance with ASME B18.21.1 standards, ensuring consistent fit and interchangeability
• Environmental regulatory compliance with RoHS 3 and REACH, meeting global safety and sustainability requirements
• Versatile compatibility with 3/8" fasteners, making it ideal for various assembly and maintenance applications
• Durable material thickness ranging from 0.064" to 0.104", offering resilience against wear and deformation

Professional Applications & Engineering Value

This USS flat washer is engineered to address critical challenges in industrial fastening systems, such as surface abrasion, bolt loosening, and corrosion-induced failure. The zinc-plated steel material provides a protective barrier against moisture and chemicals, significantly enhancing corrosion resistance in outdoor or harsh indoor settings. Its flat washer design ensures even pressure distribution across connected surfaces, reducing stress concentrations that can lead to material fatigue or joint failure. Commonly used in machinery assembly, structural frameworks, and automotive applications, this washer maintains Grade 5 strength to support heavy-duty loads while complying with ASME B18.21.1 specifications for dimensional accuracy. The inch-based sizing (3/8" screw size) facilitates seamless integration with standard industrial washers and fastener systems, streamlining procurement and installation processes for engineers and maintenance teams.

Specification Summary & Compliance

This washer adheres to ASME B18.21.1 standards for dimensional tolerances and mechanical properties, with an inner diameter of 0.438", outer diameter of 1", and thickness ranging from 0.064" to 0.104". It is manufactured from zinc-plated steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety criteria for industrial use.