S-91133A115 0.438" ID Square Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with galvanized steel construction, ensuring long-term durability in harsh industrial environments.
• Excellent load distribution thanks to the 2" square design, reducing surface pressure and preventing material damage.
• Precise fit for 3/8" screws with a 0.438" inner diameter, minimizing installation errors and enhancing assembly reliability.
• Consistent performance with Rockwell B40 hardness, providing reliable strength and resistance to deformation under stress.
• Wide thickness tolerance (0.235-0.265") for versatile application across various clamping requirements without compromising stability.
• Compliance with RoHS 3 and REACH standards, ensuring safe, eco-friendly use in regulated industries and global markets.
• Heavy-duty construction ideal for demanding applications, offering enhanced security in mechanical and structural fastening.

Professional Applications & Engineering Value

This galvanized steel square washer is engineered to address common industrial challenges such as corrosion, vibration loosening, and uneven load distribution. The square shape provides a larger surface area compared to round washers, effectively spreading force and preventing embedment into soft materials. Made from galvanized steel, it offers robust protection against rust and environmental wear, making it ideal for outdoor construction, machinery assembly, and structural frameworks. With a precise 0.438" inner diameter tailored for 3/8" screw size applications, it ensures secure fastening in heavy-duty settings like building infrastructure, automotive components, and industrial equipment. The combination of Rockwell B40 hardness and standardized dimensions delivers consistent performance, reducing maintenance needs and enhancing operational safety in demanding engineering projects.

Specification Summary & Compliance

This square washer features an inner diameter of 0.438", width of 2", and thickness range of 0.235-0.265", manufactured to inch system standards for precise compatibility. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety guidelines. The Rockwell B40 hardness confirms consistent material strength, suitable for industrial applications requiring reliable load-bearing and corrosion resistance.