S-97725A133 21.2 mm ID x 25.9 mm OD DIN 7603 Metal Sealing Washers

Key Features & Benefits at a Glance

• Superior electrical conductivity for reliable current transfer in electrical and grounding applications
• Excellent corrosion resistance ensuring long-term performance in harsh industrial environments
• Precise dimensional tolerances with 21.2mm ID and 25.9mm OD for perfect fit with M21 fasteners
• Optimized thickness range (1.3-1.7mm) providing ideal compression and sealing capabilities
• DIN 7603 compliance guaranteeing standardized quality and interchangeability in European markets
• Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
• Enhanced thermal performance making them ideal for applications requiring heat dissipation

Professional Applications & Engineering Value

These M21 copper flat washers deliver critical engineering solutions where electrical conductivity and corrosion resistance are paramount. The high-purity copper material ensures minimal electrical resistance in grounding systems, electrical panels, and power distribution equipment, while naturally resisting oxidation in humid or chemical-exposed environments. Their DIN 7603 specification provides consistent dimensional accuracy for reliable sealing in plumbing, hydraulic, and pneumatic systems using M21 metric screws. The combination of thermal conductivity and malleability makes these washers ideal for automotive, marine, and industrial machinery applications where temperature fluctuations and vibration resistance are concerns.

Specification Summary & Compliance

Manufactured to DIN 7603 standards with precise dimensional specifications: 21.2mm inner diameter, 25.9mm outer diameter, and 1.3-1.7mm thickness range. These metric copper washers are designed specifically for M21 screw sizes and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet the latest European Union requirements for hazardous substance restrictions and chemical safety.