S-91128A410 11 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 from the 50mm square design, preventing surface damage and maintaining joint integrity
• Precise M8 screw compatibility with 11mm inner diameter, ensuring secure fastening and reducing installation errors
• Enhanced durability with Rockwell 15N80 hardness, providing reliable performance under heavy-duty mechanical stress
• Regulatory compliance assurance meeting RoHS 3 and REACH standards, enabling safe use in regulated industries
• Optimized thickness of 6.0mm delivering consistent spacing and vibration resistance in demanding applications
• Metric system standardization facilitating global procurement and interchangeability in international projects

Professional Applications & Engineering Value

This M8 square washer delivers critical engineering solutions where standard washers fall short. The black-oxide steel construction provides superior corrosion protection for outdoor equipment, agricultural machinery, and marine applications where moisture exposure is constant. The square configuration prevents rotation during bolt tightening, maintaining alignment in structural steel connections and conveyor systems. With Rockwell 15N80 hardness, it withstands extreme compression forces in heavy machinery bases and industrial mounting applications. The precise 11mm ID ensures perfect M8 screw compatibility while the 50mm width distributes clamping force across broader surfaces, preventing material deformation in soft substrates and painted surfaces. These features make it indispensable for maintenance teams and OEM manufacturers requiring heavy-duty fastening solutions that combine mechanical strength with long-term reliability.

Specification Summary & Compliance

Manufactured to precise metric dimensions: 50mm width, 11mm inner diameter, and 6.0mm thickness with square configuration. The black-oxide steel material achieves Rockwell 15N80 hardness for consistent performance. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as steel alloying element and REACH (EC 1907/2006) standards as of 01/17/2023, ensuring environmental regulatory adherence for industrial distribution and use.