S-91128A415 13 mm ID Square Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide steel surface treatment, extending service life in harsh industrial environments.
• Exceptional load distribution due to the large 50mm square surface area, preventing surface damage and joint loosening.
• High mechanical strength and durability ensured by Rockwell 15N80 hardness, maintaining integrity under heavy loads.
• Precision fit for M10 metric screws with a 13mm inner diameter, providing secure fastening and reducing installation errors.
• Robust 6.0mm thickness offers enhanced stability and vibration resistance in demanding applications.
• Full regulatory compliance with RoHS 3 and REACH, ensuring safe use in regulated industries and global market access.
• Versatile square design prevents rotation during tightening, improving assembly efficiency and reliability.

Professional Applications & Engineering Value

This heavy-duty square washer is engineered to solve critical challenges in industrial assembly and construction. The black-oxide steel construction provides a protective barrier against rust and corrosion, making it ideal for outdoor machinery, automotive frames, and structural steel connections exposed to moisture. Its square shape and substantial 50mm width distribute clamping force over a wider area, preventing embedment into soft materials and reducing stress concentration on bolted joints. With a Rockwell 15N80 hardness, it withstands high tensile and dynamic loads without deforming, ensuring long-term joint integrity in M10 metric screw applications. This washer is a reliable choice for engineers seeking to enhance safety, minimize maintenance, and comply with stringent industry standards.

Specification Summary & Compliance

This square washer features a precise 13mm inner diameter compatible with M10 metric screws, a 6.0mm thickness, and 50mm width. It is manufactured from black-oxide steel with a hardness of Rockwell 15N80. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) regarding SVHCs as of January 17, 2023, meeting international environmental and safety regulations for industrial components.