S-97985A730 4.3 mm ID x 8 mm OD DIN 6798 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external teeth design that bites into mating surfaces, preventing loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in demanding industrial environments
• Precision dimensional compatibility with 4.3mm ID and 8mm OD ensuring perfect fit for M4 fasteners in metric assemblies
• Exceptional mechanical durability from Rockwell C35 hardness, maintaining tooth integrity and locking force through repeated use
• Guaranteed standardization through DIN 6798 compliance, ensuring consistent performance and interchangeability
• Reliable environmental compliance meeting RoHS 3 and REACH regulations for safe use in global industrial applications
• Optimized load distribution with 0.5-0.6mm thickness providing secure fastening without excessive bulk

Professional Applications & Engineering Value

This M4 external tooth lock washer delivers critical vibration-resistant performance in demanding mechanical systems where fastener security is paramount. The zinc-plated steel construction provides essential corrosion resistance for industrial equipment, automotive assemblies, and machinery exposed to harsh operating conditions. The external tooth configuration creates multiple biting points that dig into both the fastener head and bearing surface, effectively resisting rotational forces and maintaining clamp load where standard flat washers fail. Engineered to DIN 6798 specifications, this metric lock washer ensures dimensional precision for M4 fasteners in European equipment designs, preventing mismatches that compromise assembly integrity. The combination of Rockwell C35 hardness and precise tooth geometry maintains locking effectiveness through thermal cycling and mechanical stress, making it ideal for critical joints in manufacturing, transportation, and heavy equipment applications.

Specification Summary & Compliance

This external tooth lock washer features precision dimensions of 4.3mm internal diameter, 8mm outer diameter, and 0.5-0.6mm thickness specifically engineered for M4 screw applications. Manufactured to DIN 6798 standards for dimensional accuracy and performance requirements. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial use across global markets.