S-91128A113 0.562" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel coating, ensuring long-term durability in harsh industrial environments.
• Superior load distribution due to the 3" square design, reducing stress and preventing surface damage in heavy-duty applications.
• Precise fit for 1/2" screws with a 0.562" inner diameter, minimizing play and improving assembly accuracy.
• Consistent thickness (0.235-0.265") for reliable performance and uniform pressure across fastened joints.
• High hardness rating (Rockwell 15N80) providing excellent wear resistance and maintaining structural integrity under high stress.
• Compliance with RoHS 3 and REACH regulations, ensuring safe, eco-friendly use in global markets without lead concerns under exemption 6(a).
• Ideal for inch-based systems, facilitating easy integration into standard industrial equipment and reducing compatibility issues.

Professional Applications & Engineering Value

This square washer in black-oxide steel addresses common engineering challenges like corrosion and uneven load distribution in heavy machinery, construction, and automotive assemblies. The square shape offers a larger surface area than round washers, effectively spreading force to prevent bolt loosening and material deformation. With a Rockwell 15N80 hardness, it withstands repetitive stress and abrasive conditions, while the precise 0.562" ID ensures a snug fit for 1/2" screw sizes, reducing maintenance needs. Its RoHS and REACH compliance makes it suitable for regulated industries, providing reliability in industrial applications without environmental trade-offs.

Specification Summary & Compliance

This washer features an inner diameter of 0.562", thickness range of 0.235-0.265", and width of 3", designed for use with 1/2" screws in inch measurement systems. It adheres to standard dimensional tolerances and is manufactured from black-oxide steel with a hardness of Rockwell 15N80 for consistent performance. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a) for lead in steel and REACH (EC 1907/2006) compliant as of January 17, 2023, meeting essential health and environmental standards for industrial use.