S-90474A125 0.188" ID x 0.375" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc yellow-chromate plating, extending service life in harsh industrial environments
• Exceptional load distribution from precise flat design, preventing surface damage and fastener loosening under vibration
• High-strength Grade 8 construction with Rockwell C38 hardness for reliable performance in heavy-duty applications
• Precision dimensional accuracy (0.188" ID / 0.375" OD) ensuring perfect fit for No. 8 screws and consistent installation
• Industry-standard compliance with ASME B18.21.1 specifications for guaranteed mechanical properties and interchangeability
• Environmental regulation adherence through RoHS 3 and REACH compliance, meeting global manufacturing requirements
• Optimized thickness range (0.036-0.045") providing ideal balance between spacing needs and structural integrity

Professional Applications & Engineering Value

These Grade 8 flat washers deliver critical engineering solutions where vibration resistance and corrosion protection are paramount. The zinc yellow-chromate plated steel construction creates a robust barrier against moisture and chemicals, significantly reducing maintenance frequency in outdoor equipment, automotive assemblies, and industrial machinery. With Rockwell C38 hardness and ASME B18.21.1 compliance, these inch-system washers maintain clamping force under extreme loads while preventing galvanic corrosion between dissimilar metals. The precise 0.188" ID and 0.375" OD dimensions ensure proper bearing surface for No. 8 fasteners, eliminating stress concentration points that lead to joint failure in structural applications.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 dimensional and mechanical specifications with inch measurement system compatibility. Features precise internal diameter (0.188"), external diameter (0.375"), and controlled thickness (0.036-0.045") for No. 8 screw applications. The Grade 8 classification and Rockwell C38 hardness verify high-strength performance. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe usage across global industrial markets.