S-90412A170 13 mm ID x 20.5 mm OD DIN 6797 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Exceptional corrosion resistance thanks to 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Precise dimensional compatibility with 13mm ID and 20.5mm OD ensuring perfect fit for M12 fasteners
• Reliable locking performance meeting DIN 6797 standards for consistent quality and engineering predictability
• Enhanced durability with 0.9-1.2mm thickness providing optimal spring tension and long service life
• Regulatory compliance assurance with RoHS 3 and REACH compliance for safe use in regulated industries
• Optimized load distribution through external tooth design that minimizes surface damage while maintaining secure fastening

Professional Applications & Engineering Value

This M12 external tooth lock washer delivers critical vibration resistance in demanding industrial applications where fastener security is paramount. Engineered from 316 stainless steel, it provides superior corrosion resistance in marine, chemical processing, and outdoor environments where ordinary washers would fail. The external tooth configuration creates multiple biting points that dig into both the fastener and workpiece, effectively preventing rotational loosening caused by machinery vibrations, thermal cycling, or dynamic loads. This DIN 6797 compliant design ensures consistent performance in assembly lines, heavy equipment, automotive systems, and structural applications where safety and reliability cannot be compromised. The combination of precise metric dimensions and premium material makes this lock washer an essential component for engineers seeking to eliminate maintenance downtime and ensure long-term joint integrity.

Specification Summary & Compliance

This external tooth lock washer features precise metric dimensions with 13mm internal diameter, 20.5mm external diameter, and thickness ranging from 0.9-1.2mm, specifically designed for M12 fastener applications. Manufactured in compliance with DIN 6797 standards for dimensional accuracy and performance requirements. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (updated January 17, 2023, covering 233 SVHC substances), ensuring environmental responsibility and workplace safety in industrial procurement.