S-98688A181 21 mm ID x 34 mm OD DIN 433 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
- Corrosion-resistant zinc plating extends service life in humid or demanding industrial environments
- Precise M20 screw compatibility ensures perfect fit and uniform load distribution across fastened assemblies
- DIN 433 certification guarantees dimensional accuracy and interchangeability in European machinery applications
- 2.7-3.3mm thickness range provides optimal compression resistance while maintaining flexibility during installation
- 34mm outer diameter creates ample bearing surface to prevent fastener embedding in soft materials
- Full RoHS 3 & REACH compliance meets stringent international environmental regulations for industrial components
- Zinc plated steel construction delivers superior strength-to-weight ratio for heavy-duty mechanical applications
Professional Applications & Engineering Value
Engineered for industrial machinery assembly, these M20 flat washers with zinc plated steel construction solve critical fastening challenges in corrosive environments. The DIN 433 standard ensures precise dimensional stability that prevents loosening under vibration, while the 21mm ID provides exact clearance for M20 fasteners to eliminate cross-threading issues. In electrical enclosures, automotive assemblies, and structural steel connections, the corrosion-resistant plating maintains electrical continuity and prevents galvanic corrosion between dissimilar metals. The optimized 34mm OD distributes clamping force effectively across joined surfaces, protecting delicate materials from crushing while maintaining joint integrity in high-vibration applications.
Specification Summary & Compliance
Manufactured to DIN 433 specifications with metric dimensions: 21mm inner diameter, 34mm outer diameter, and 2.7-3.3mm thickness range. Constructed from zinc plated steel for corrosion protection. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no SVHC above threshold limits as of June 2023. Designed specifically for M20 screw applications in industrial and commercial fastening systems.
