S-91106A135 13 mm ID x 20.5 mm OD DIN 6797 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection through black-oxide steel construction for extended service life in demanding environments
• Precision dimensional compatibility with 13mm ID specifically engineered for M12 screw applications
• Optimized load distribution with 20.5mm OD providing increased bearing surface area
• Consistent mechanical performance ensured by Rockwell C35 hardness for reliable spring action and tooth engagement
• Guaranteed standardization through DIN 6797 compliance for interchangeability and quality assurance
• Environmental regulatory compliance meeting RoHS 3 and REACH requirements for global industrial applications

Professional Applications & Engineering Value

This M12 tooth lock washer delivers critical vibration-resistant fastening solutions for industrial machinery, automotive assemblies, and heavy equipment where dynamic loads cause conventional fasteners to fail. The internal tooth configuration creates multiple biting points that dig into both the bolt head and mounting surface, effectively resisting rotational forces and maintaining clamp load integrity. Manufactured from black-oxide steel, the washer provides essential corrosion resistance while maintaining the dimensional precision required for metric fastening systems. The combination of Rockwell C35 hardness and strict DIN 6797 compliance ensures consistent spring performance and reliable locking action across high-volume production applications, reducing maintenance frequency and preventing costly downtime from fastener failure.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 13mm internal diameter, 20.5mm outer diameter, and 0.9-1.2mm thickness range, engineered specifically for M12 screw applications. Manufactured in compliance with DIN 6797 standards for dimensional accuracy and mechanical properties, with material hardness maintained at Rockwell C35 for optimal spring performance. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial markets and restricted substance requirements.