S-91144A113 21 mm ID x 37 mm OD DIN 6916, ISO 7416 Structural Washers

Key Features & Benefits at a Glance

• Superior corrosion protection with hot-dipped galvanized steel coating, extending service life in harsh environments
• Exceptional load distribution from precise 37mm outer diameter, preventing surface damage and joint loosening
• Guaranteed dimensional compatibility with 21mm inner diameter specifically engineered for M20 screw applications
• Enhanced structural integrity through Rockwell C45 hardness rating, maintaining shape under heavy loads
• Rigorous quality assurance through dual compliance with DIN 6916 and ISO 7416 international standards
• Environmental responsibility with full RoHS 3 and REACH compliance for sustainable operations
• Optimized thickness range (3.7-4.3mm) providing consistent performance across industrial applications

Professional Applications & Engineering Value

This M20 flat washer delivers critical engineering solutions for heavy-duty industrial applications where corrosion resistance and structural stability are paramount. The hot-dipped galvanized steel construction creates a robust barrier against moisture, chemicals, and environmental degradation, significantly reducing maintenance frequency in construction, machinery assembly, and infrastructure projects. Manufactured to DIN 6916 and ISO 7416 specifications, these washers ensure perfect compatibility with M20 fasteners while their Rockwell C45 hardness prevents deformation under extreme pressure. The precise 21mm ID and 37mm OD combination provides optimal surface contact, distributing clamp load effectively to prevent joint failure and material damage in demanding operational conditions.

Specification Summary & Compliance

This metric flat washer features dimensional specifications of 21mm inner diameter, 37mm outer diameter, and 3.7-4.3mm thickness range, manufactured to DIN 6916 and ISO 7416 standards for dimensional accuracy and performance reliability. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global industrial markets while meeting stringent hardness requirements of Rockwell C45 for consistent mechanical performance.