S-98026A031 0.438" ID x 1" OD ASME B18.21.1 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion protection with zinc yellow-chromate plating, extending service life in harsh industrial environments
• Exceptional load distribution due to 1" OD and flat design, preventing surface damage and fastener loosening
• High-strength performance with Grade 8 classification and Rockwell C38 hardness, suitable for heavy-duty applications
• Precise fit and alignment with 0.438" ID designed specifically for 3/8" screws, ensuring secure fastening
• Regulatory compliance assurance meeting ASME B18.21.1 standards and REACH requirements for safe industrial use
• Durable steel construction providing reliable performance under high-stress conditions and repeated use
• Versatile industrial application with USS designation, compatible with various machinery and structural assemblies

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this Grade 8 USS flat washer delivers critical performance where vibration resistance and load distribution are paramount. The zinc yellow-chromate plated steel construction provides enhanced corrosion protection, significantly outperforming standard finishes in humid or chemically aggressive settings. With its precise 3/8" screw size compatibility and optimal thickness range (0.064-0.104"), this washer effectively prevents joint relaxation and surface indentation in heavy machinery, structural steel connections, and high-vibration equipment. The USS designation ensures proper load spreading characteristics, while the Rockwell C38 hardness maintains dimensional stability under extreme pressure, making it ideal for construction, manufacturing, and automotive applications where fastener integrity cannot be compromised.

Specification Summary & Compliance

This precision flat washer features dimensional specifications including 0.438" ID, 1" OD, and thickness range of 0.064-0.104" with manufacturing compliance to ASME B18.21.1 standards. The product maintains REACH compliance (EC 1907/2006) regarding substance restrictions and meets Grade 8 strength classification requirements. Material certification includes zinc yellow-chromate plated steel with verified Rockwell C38 hardness testing, ensuring consistent performance across industrial applications.