S-99041A109 0.438" ID Square Washers

Key Features & Benefits at a Glance

• Superior load distribution with a 1" square design, preventing surface damage and loosening under heavy loads
• Enhanced corrosion resistance from zinc-plated steel, ensuring long-term durability in harsh industrial environments
• Precise fit for 3/8" screws with a 0.438" inner diameter, reducing installation errors and improving assembly efficiency
• Consistent mechanical strength with Rockwell B40 hardness, providing reliable performance under repeated stress
• Optimal thickness range (0.120-0.140") for balanced compression and vibration resistance in demanding applications
• Compliance with global safety standards including RoHS 3 and REACH, ensuring safe use in regulated industries
• Dimensional stability in inch measurements, facilitating seamless integration with standard 3/8" fastener systems

Professional Applications & Engineering Value

This zinc-plated steel square washer addresses critical engineering challenges in industrial equipment assembly, construction, and machinery maintenance. Its square shape provides a larger bearing surface than round washers, effectively distributing clamp load and preventing embedment into soft materials or painted surfaces. The zinc plating offers a protective barrier against moisture and chemicals, significantly extending service life in outdoor or corrosive environments. With precise 0.438" ID matching standard 3/8" screw sizes, it eliminates play and misalignment during installation, while the Rockwell B40 hardness ensures the washer maintains its form under high bolt tension. These characteristics make it ideal for structural connections, heavy-duty framing, and applications requiring reliable load distribution and corrosion protection.

Specification Summary & Compliance

This square washer features inch dimensioning with 0.438" inner diameter, 1" width, and thickness ranging 0.120-0.140" for consistent performance. Manufactured from zinc-plated steel with Rockwell B40 hardness, it meets standard requirements for 3/8" screw applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial components.