S-91106A124 4.3 mm ID x 8 mm OD DIN 6797 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth design that bites into mating surfaces, preventing loosening under dynamic loads
• Enhanced durability with Rockwell C35 hardness steel construction that maintains performance in demanding applications
• Precise dimensional accuracy with 4.3mm ID and 8mm OD ensuring perfect fit for M4 screw applications
• Corrosion-resistant black-oxide coating that provides lasting protection in harsh industrial environments
• Reliable compliance with DIN 6797 standards for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use across regulated industries
• Optimized thickness (0.4-0.6mm) providing effective locking while maintaining compact assembly profiles

Professional Applications & Engineering Value

These M4 metric tooth lock washers deliver critical vibration-resistant fastening solutions where safety and reliability are paramount. The black-oxide steel construction combined with internal tooth configuration creates a mechanical locking action that prevents back-off in high-vibration environments common in automotive assemblies, heavy machinery, and industrial equipment. Unlike standard flat washers, the precisely engineered teeth dig into both the bearing surface and fastener head, distributing clamping force evenly while resisting rotational forces. The Rockwell C35 hardness ensures the teeth maintain their biting capability through repeated stress cycles, making these DIN 6797 compliant washers ideal for applications where thermal cycling, mechanical shocks, or constant vibration would compromise ordinary fastening solutions.

Specification Summary & Compliance

Manufactured to DIN 6797 specifications with precise dimensional tolerances including 4.3mm internal diameter and 8mm outer diameter. The internal tooth location provides optimal locking performance for M4 screw applications. These washers meet Rockwell C35 hardness standards and feature a protective black-oxide steel finish. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and regulatory acceptance for industrial applications worldwide.