S-91120A211 13 mm ID x 20.5 mm OD DIN 6798 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Excellent corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precision dimensional compatibility with M12 fasteners (13mm ID, 20.5mm OD) ensuring perfect fit and optimal performance
• Enhanced load distribution from the tooth lock design that minimizes surface damage while maintaining secure fastening
• Industry-standard compliance with DIN 6798 specifications for reliable performance in mechanical assemblies
• Environmental regulatory compliance meeting RoHS 3 and REACH standards for safe industrial use
• Consistent thickness control (0.9-1.2mm) providing uniform clamping force and reliable locking action

Professional Applications & Engineering Value

This M12 external tooth lock washer delivers critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. The 18-8 stainless steel construction provides exceptional corrosion resistance, making it ideal for automotive assemblies, machinery manufacturing, and outdoor equipment exposed to environmental elements. The external tooth configuration according to DIN 6798 standards ensures positive locking action by biting into both the fastener head and mating surface, effectively preventing rotational loosening caused by vibration or thermal cycling. This design maintains electrical continuity in grounded assemblies while distributing load evenly to prevent surface damage. The metric dimensions (13mm ID, 20.5mm OD) provide precise compatibility with M12 fasteners in European-engineered equipment and global industrial applications requiring reliable, maintenance-free fastening solutions.

Specification Summary & Compliance

This external tooth lock washer features precise metric dimensions with 13mm internal diameter, 20.5mm external diameter, and 0.9-1.2mm thickness range. Manufactured to DIN 6798 specifications for dimensional accuracy and performance reliability. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors. Constructed from 18-8 stainless steel for corrosion resistance, with external tooth location providing optimal locking performance for M12 fastener applications.