S-98970A131 0.438" ID x 1" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion protection with hot-dipped galvanized steel construction for extended service life in harsh environments
• Optimal load distribution with 1" outer diameter providing excellent surface coverage for 3/8" fasteners
• Precision dimensional accuracy with 0.438" inner diameter ensuring perfect fit and alignment with mating components
• Industry-standard compliance meeting ASME B18.21.1 specifications for reliable performance in demanding applications
• Environmental responsibility with RoHS 3 compliance ensuring safe use across various industrial sectors
• Versatile thickness range from 0.064" to 0.104" accommodating different assembly requirements and compression needs
• Heavy-duty construction designed to withstand significant mechanical stress in industrial and construction applications

Professional Applications & Engineering Value

These USS flat washers deliver exceptional engineering value through their hot-dipped galvanized steel construction, specifically engineered to combat corrosion in demanding industrial environments. The robust inch system dimensions (0.438" ID × 1" OD) provide optimal load distribution for 3/8" fasteners, preventing surface damage and maintaining joint integrity under vibration and dynamic loads. The flat washer design excels in construction, machinery assembly, and structural applications where reliable bearing surface and corrosion resistance are critical. Meeting ASME B18.21.1 standards, these washers ensure consistent performance in heavy-duty bolted connections, bridge construction, and outdoor equipment where environmental exposure would compromise ordinary fasteners.

Specification Summary & Compliance

Manufactured to precise dimensional standards with inner diameter of 0.438" and outer diameter of 1", these USS flat washers feature thickness ranging from 0.064" to 0.104" for 3/8" screw size applications. The products strictly conform to ASME B18.21.1 specifications for dimensional accuracy and performance requirements. Environmental compliance is assured through RoHS 3 (2015/863/EU) compliance, making these washers suitable for use across various regulated industries and applications requiring environmentally conscious components.