S-4340N115 8.4 mm ID x 15.3 mm OD DIN 6798 Countersunk Tight-Grip 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
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in demanding industrial environments
• Perfect countersink compatibility with 90° angle design ensuring flush mounting in tapered screw head applications
• Precision dimensional control with 8.4mm ID and 15.3mm OD maintaining consistent performance in M8 fastener assemblies
• Optimized mechanical strength with Rockwell C35 hardness providing durable locking performance without material deformation
• International standard compliance meeting DIN 6798 specifications for reliable interchangeability and quality assurance
• Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications

Professional Applications & Engineering Value

This M8 external tooth lock washer delivers critical vibration-resistant fastening solutions for industrial machinery, automotive assemblies, and electrical equipment where dynamic loads cause conventional fasteners to fail. The zinc-plated steel construction provides essential corrosion protection while maintaining the Rockwell C35 hardness necessary for repeated disassembly cycles. The precisely engineered 90° countersink angle ensures seamless integration with matching screw heads, eliminating protrusion issues in precision equipment. With external tooth configuration creating multiple biting points, this washer distributes clamping force evenly, preventing surface damage while maintaining secure locking in high-vibration environments common in manufacturing, transportation, and heavy equipment applications.

Specification Summary & Compliance

Manufactured to DIN 6798 standards with precise dimensional tolerances: 8.4mm internal diameter, 15.3mm external diameter, and 0.35-0.45mm thickness range. The metric M8 sizing ensures compatibility with standard fastener systems. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental standards for industrial components. The external tooth location and 90° countersink angle maintain geometric precision as specified in the DIN standard, providing reliable performance in critical fastening applications.