S-90483A109 31 mm ID x 56 mm OD DIN 125; ISO 7089 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc yellow-chromate plating that protects against harsh industrial environments and extends service life
• Exceptional load distribution across a 56mm outer diameter surface to prevent surface damage and maintain joint integrity under M30 screw loads
• Precision dimensional accuracy with 31mm inner diameter ensuring perfect fit and alignment for M30 fasteners in demanding applications
• Enhanced durability from Rockwell C15 hardness steel construction that withstands vibration and maintains shape under pressure
• Guaranteed interchangeability through compliance with both DIN 125 and ISO 7089 international standards for consistent performance
• Optimized thickness range of 3.7-4.3mm providing reliable spacing and tension control in assembled components
• Industry-proven reliability in metric measurement system applications where precision and standardization are critical

Professional Applications & Engineering Value

This heavy-duty flat washer delivers critical engineering value in industrial settings where corrosion resistance and structural integrity are paramount. The zinc yellow-chromate plated steel construction provides exceptional protection against moisture, chemicals, and environmental degradation, significantly extending the service life of fastened assemblies in outdoor, marine, or chemical processing applications. With its M30 screw compatibility and precise 31mm ID/56mm OD dimensions, this washer effectively distributes clamping forces across wider surfaces, preventing material deformation and maintaining bolt preload in heavy machinery, structural steel connections, and industrial equipment. The combination of Rockwell C15 hardness and standardized metric dimensions ensures reliable performance in high-vibration environments where fastener integrity cannot be compromised.

Specification Summary & Compliance

This precision flat washer features 31mm inner diameter and 56mm outer diameter with 3.7-4.3mm thickness tolerance, manufactured to exacting DIN 125 and ISO 7089 standards for dimensional consistency and interchangeability. The component maintains proper Class 2A thread compatibility for M30 fasteners and is constructed from zinc yellow-chromate plated steel with Rockwell C15 hardness for mechanical durability. Manufacturing complies with international metric system requirements and meets industry standards for heavy-duty industrial applications, ensuring reliable performance across global engineering projects.