S-91128A420 16 mm ID Square Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel coating, extending service life in harsh industrial environments
• Exceptional load distribution thanks to the 50mm square design, preventing surface damage and maintaining joint integrity
• Precision M12 compatibility with 16mm inner diameter, ensuring secure fit and reducing installation errors
• Enhanced durability from Rockwell 15N80 hardness, resisting deformation under high-stress applications
• Regulatory compliance assurance with RoHS 3 and REACH standards, meeting global environmental and safety requirements
• Optimized thickness design at 6.0mm, providing stable spacing without adding unnecessary bulk to assemblies
• Versatile metric sizing for seamless integration with international machinery and equipment standards

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this black-oxide steel square washer delivers critical performance advantages in construction, heavy machinery, and manufacturing equipment. The M12 metric compatibility combined with the substantial 50mm width creates an optimal bearing surface that prevents bolt head embedment and distributes clamping forces evenly across connected components. The Rockwell 15N80 hardness rating ensures the washer maintains its structural integrity under repeated loading cycles, while the corrosion-resistant black-oxide finish protects against environmental degradation in outdoor or high-moisture applications. This combination of precise dimensions, material strength, and surface treatment addresses common failure points in industrial fastening systems, providing reliable performance where vibration, heavy loads, and corrosive elements threaten assembly integrity.

Specification Summary & Compliance

This metric square washer features precision dimensions with 16mm inner diameter, 50mm width, and 6.0mm thickness manufactured to industrial standards. The component meets RoHS 3 (2015/863/EU) compliance with exemption 6(a) for lead as an alloying element in steel and is REACH (EC 1907/2006) compliant as of January 17, 2023, addressing 233 Substances of Very High Concern. Manufactured from black-oxide steel with Rockwell 15N80 hardness, this washer is engineered for M12 screw applications requiring reliable performance and regulatory adherence in global markets.