S-91081A130 0.375" ID x 0.875" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior load distribution with 0.875" outer diameter to prevent surface damage and maintain joint integrity
• Precise 5/16" screw compatibility with 0.375" inner diameter for secure, vibration-resistant fastening
• Heavy-duty steel construction providing excellent durability and corrosion resistance in demanding environments
• ASME B18.21.1 compliance ensuring consistent dimensional accuracy and reliable performance in industrial applications
• RoHS 3 and REACH environmental compliance meeting strict international regulations for safe, sustainable usage
• Optimized thickness range (0.064-0.104") offering flexibility for various compression and spacing requirements
• Universal USS designation compatibility making them suitable for replacement and new assembly projects across industries

Professional Applications & Engineering Value

These USS flat washers deliver critical engineering solutions where load distribution and surface protection are paramount. Manufactured from high-grade steel, they effectively prevent fastener embedding and material deformation under heavy loads in machinery, structural steel connections, and industrial equipment. The 0.375" ID ensures perfect alignment with 5/16" screws, eliminating play and reducing vibration-induced loosening. With their ASME B18.21.1 compliance, these washers maintain precise dimensional tolerances for consistent performance in construction, manufacturing, and maintenance applications, providing reliable vibration resistance and extended service life for critical assemblies.

Specification Summary & Compliance

This USS flat washer features precise inch dimensions with 0.375" inner diameter, 0.875" outer diameter, and thickness ranging 0.064-0.104" for 5/16" screw applications. Manufactured to ASME B18.21.1 standards for dimensional consistency and performance reliability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global markets. The steel construction provides mechanical strength suitable for general industrial applications where hardness rating is not specifically required.