S-91166A320 21 mm ID x 37 mm OD DIN 125; ISO 7089 General Purpose Washers
General Purpose Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Enhanced corrosion resistance with zinc plating, extending service life in harsh industrial environments
- Precise dimensional accuracy with 21mm ID and 37mm OD, ensuring reliable fit for M20 screws and uniform load distribution
- Superior mechanical strength from Rockwell B75 hardness, providing excellent durability under high-stress applications
- Global compliance assurance through DIN 125 and ISO 7089 standards, guaranteeing interchangeability and quality consistency
- Environmental and safety adherence with RoHS 3 and REACH compliance, supporting sustainable and safe industrial operations
- Optimized thickness range of 2.7-3.3mm, offering flexibility for various assembly requirements without compromising performance
Professional Applications & Engineering Value
This M20 zinc plated steel flat washer is engineered to address common industrial challenges, such as fastener loosening and surface damage. The zinc plating provides a protective barrier against corrosion, making it ideal for outdoor machinery, automotive assemblies, and construction equipment exposed to moisture. Its compliance with DIN 125 and ISO 7089 standards ensures precise dimensions and reliable performance in metric-based systems, reducing installation errors. The Rockwell B75 hardness enhances wear resistance, preventing deformation under heavy loads. By distributing pressure evenly, this flat washer minimizes stress on connected components, extending the lifespan of industrial setups and improving overall safety in heavy-duty applications.
Specification Summary & Compliance
This washer features a 21mm inner diameter, 37mm outer diameter, and 2.7-3.3mm thickness, designed for M20 screw sizes with dimensional tolerances per DIN 125 and ISO 7089 standards. It meets Rockwell B75 hardness specifications for consistent mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
