S-90474A139 0.406" ID x 1.25" OD ASME Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel coating, ideal for harsh industrial environments and extending service life
• Superior load distribution due to precise 1.25" OD and 0.406" ID, reducing stress on fastened components
• Consistent performance under pressure with Rockwell B80 hardness, ensuring durability and resistance to deformation
• Reliable fit for 3/8" screws, providing secure fastening and minimizing loosening in mechanical assemblies
• Compliance with global standards including RoHS 3 and REACH, meeting strict environmental and safety regulations
• Versatile thickness range (0.080-0.115") allowing for flexibility in gap filling and tension adjustment
• Dependable for heavy-duty applications thanks to robust steel material and inch-system precision

Professional Applications & Engineering Value

These flat washers made from black-oxide steel are engineered to address common industrial challenges such as corrosion, vibration, and component wear. The black-oxide surface treatment provides a protective layer that resists rust and oxidation, making them suitable for outdoor equipment, automotive assemblies, and machinery exposed to moisture. With a Rockwell B80 hardness, they maintain structural integrity under high loads, preventing failures in heavy-duty washers applications. The precise 0.406" ID and 1.25" OD ensure even pressure distribution, reducing the risk of damage to connected parts. Ideal for use in construction, manufacturing, and mechanical systems, these 3/8 inch washers offer long-term reliability and compliance with industry standards, supporting efficient and safe operations.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.406", outer diameter of 1.25", and thickness range of 0.080-0.115", designed for screw size 3/8" with inch system measurements. It adheres to standard dimensional tolerances and is manufactured from black-oxide steel with a hardness of Rockwell B80. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use.