S-91128A317 26 mm ID Square Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to the black-oxide steel finish, extending service life in harsh industrial environments
• Exceptional load distribution from the square 50mm width, preventing fastener loosening and surface damage under high stress
• Precise M20 screw fit with a 26mm inner diameter, ensuring secure fastening and reducing installation errors
• Enhanced durability provided by the Rockwell 15N80 hardness rating, resisting deformation under heavy loads
• Reliable chemical compliance with RoHS 3 and REACH standards, ensuring safety and environmental responsibility
• Robust 6mm thickness for added structural support in demanding mechanical assemblies
• Metric sizing compatibility for seamless integration with international machinery and equipment

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this M20 square washer delivers critical performance where standard washers fail. The black-oxide steel construction provides a protective barrier against moisture, chemicals, and abrasion, significantly reducing maintenance costs in sectors like construction, machinery manufacturing, and automotive assembly. Its square design offers a larger surface area than round washers, effectively distributing clamp load and preventing bolt head embedment into soft materials. With a Rockwell 15N80 hardness, it maintains structural integrity under vibration and dynamic loads, while the precise metric dimensions ensure compatibility with M20 fasteners in global engineering projects requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This metric square washer features precise dimensions: 26mm ID, 50mm width, and 6.0mm thickness, designed for M20 screw size. Manufactured from black-oxide steel with a hardness rating of Rockwell 15N80, it meets industry standards for dimensional accuracy and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel, and REACH (EC 1907/2006) regulations as of January 17, 2023, ensuring adherence to strict environmental and safety guidelines.