S-97985A650 21 mm ID x 33 mm OD DIN 6797 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Enhanced durability with Rockwell C35 hardness rating ensuring long service life in demanding applications
• Reliable corrosion protection through zinc plating that guards against rust in industrial environments
• Precise dimensional compatibility with 21mm ID specifically designed for M20 screw applications
• Optimized load distribution with 33mm OD providing increased bearing surface area
• Guaranteed interchangeability through strict adherence to DIN 6797 manufacturing standards
• Environmental compliance assurance meeting both RoHS 3 and REACH regulations for sustainable sourcing

Professional Applications & Engineering Value

This M20 external tooth lock washer delivers critical vibration-resistant performance in heavy machinery, automotive assemblies, and industrial equipment where dynamic loads threaten fastener integrity. The strategically positioned external teeth create multiple biting points that dig into both the fastener head and workpiece surface, creating mechanical resistance against rotational loosening. Manufactured from zinc-plated steel, these washers provide essential corrosion protection while maintaining the Rockwell C35 hardness necessary to withstand repeated stress cycles without deformation. The metric dimensions (21mm ID × 33mm OD) ensure perfect compatibility with M20 fasteners in precision assemblies, while the DIN 6797 compliance guarantees consistent performance across European industrial applications requiring reliable locking solutions.

Specification Summary & Compliance

This external tooth lock washer features precise metric dimensions with 21mm internal diameter, 33mm external diameter, and 1.2-1.6mm thickness range. Manufactured to DIN 6797 specifications with external tooth configuration, it demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The washer's Rockwell C35 hardness ensures consistent performance while the zinc-plated steel construction provides both corrosion resistance and reliable locking action in industrial fastener applications.