S-91106A146 21 mm ID x 33 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, preventing loosening under dynamic loads
• Exceptional durability from Black-Oxide Steel construction with Rockwell C35 hardness for long service life
• Precise dimensional compatibility with 21mm ID and 33mm OD ensuring perfect fit for M20 fasteners
• Reliable performance through strict adherence to DIN 6797 manufacturing standards
• Enhanced corrosion protection from black-oxide surface treatment in demanding environments
• Regulatory compliance assurance with RoHS 3 and REACH standards for global industrial use
• Optimized thickness range (1.2-1.5mm) providing ideal spring tension without compromising assembly integrity

Professional Applications & Engineering Value

This M20 internal tooth lock washer delivers critical engineering solutions where vibration-induced fastener failure poses significant operational risks. The Black-Oxide Steel construction combined with Rockwell C35 hardness ensures the teeth maintain their biting action through repeated stress cycles, effectively preventing rotational loosening in heavy machinery, automotive assemblies, and industrial equipment. The internal tooth configuration concentrates locking force directly beneath the fastener head, distributing load evenly while minimizing surface marring. Engineered to DIN 6797 standards, this metric lock washer provides reliable performance in high-vibration environments where standard flat washers would fail, making it ideal for motor mounts, pump assemblies, and structural connections requiring maintained clamping force.

Specification Summary & Compliance

This precision internal tooth lock washer features 21mm internal diameter and 33mm outer diameter with 1.2-1.5mm thickness range, manufactured to exacting DIN 6797 specifications for dimensional accuracy and performance consistency. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and unrestricted use in global industrial markets. The black-oxide surface treatment provides additional corrosion resistance while maintaining the structural integrity of the base steel material.