S-4340N117 13 mm ID x 23 mm OD DIN 6798 Countersunk Tight-Grip External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces, preventing loosening under dynamic loads.
• Enhanced durability and corrosion protection from zinc-plated steel construction, ideal for harsh industrial environments.
• Precise fit and reliable performance with a 90° countersink angle, ensuring flush mounting and even pressure distribution.
• High hardness (Rockwell C35) provides excellent spring-back action and maintains locking force over repeated use.
• Compliance with DIN 6798 standards guarantees dimensional accuracy and interchangeability in metric assemblies.
• Environmental and safety assurance through RoHS 3 and REACH compliance, meeting strict regulatory requirements.
• Optimized for M12 screw sizes with 13mm ID and 23mm OD, offering secure fastening in heavy-duty applications.

Professional Applications & Engineering Value

This M12 external tooth lock washer is engineered to address critical issues like vibration-induced loosening and joint failure in industrial settings. Made from zinc-plated steel, it combines high tensile strength with corrosion resistance, extending service life in machinery, automotive, and construction applications. The external tooth design and countersunk profile ensure maximum grip on surfaces, distributing load evenly and maintaining bolt preload under stress. By adhering to DIN 6798 standards, it delivers consistent performance in metric fastening systems, reducing maintenance downtime and enhancing safety in high-vibration environments like engines, conveyors, and structural assemblies.

Specification Summary & Compliance

This washer features precise dimensions with an internal diameter of 13mm, external diameter of 23mm, and thickness of 0.45-0.55mm, designed for M12 screw sizes and a 90° countersink angle. It conforms to DIN 6798 for dimensional and performance standards, ensuring reliable fit and function. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), affirming its adherence to environmental and safety regulations without hazardous substances.