S-98026A112 0.375" ID x 0.875" OD ASME B18.21.1 General Purpose Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with 0.875" OD and 0.375" ID to prevent surface damage and maintain joint integrity under high stress
• Superior corrosion resistance thanks to black corrosion-resistant coated steel, ideal for harsh industrial environments
• High-strength performance with Grade 8 classification and Rockwell C38 hardness for demanding applications
• Precise dimensional accuracy manufactured to USS standards for consistent fit with 5/16" fasteners
• Long-term reliability ensured by compliance with ASME B18.21.1 specifications for quality and safety
• Environmental and regulatory safety with full RoHS 3 and REACH compliance, meeting global substance restrictions
• Optimized thickness range (0.064-0.080") providing flexibility for various clamping and spacing needs

Professional Applications & Engineering Value

These Grade 8 USS flat washers are engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration loosening and corrosion can compromise safety. The black corrosion-resistant coated steel construction protects against rust and chemical exposure, extending service life in outdoor or humid conditions. With a 5/16" screw size compatibility and robust Rockwell C38 hardness, they distribute clamping forces evenly, reducing stress concentrations and preventing fastener failure. Ideal for industrial applications requiring ASME B18.21.1 compliance, these washers ensure reliable performance in high-torque environments, from structural bolting to equipment manufacturing, while meeting strict RoHS and REACH standards for sustainable operations.

Specification Summary & Compliance

This washer adheres to USS inch measurement standards with precise dimensions: ID 0.375", OD 0.875", and thickness 0.064-0.080". It conforms to ASME B18.21.1 for flat washer design and manufacturing, ensuring consistent quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. With a Grade 8 strength classification and material hardness of Rockwell C38, it meets rigorous industrial requirements for durability and safety in fastener systems.