S-97985A112 2.8 mm ID x 5.5 mm OD DIN 6797 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external teeth design that bites into mating surfaces, preventing fastener loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in demanding industrial environments
• Precision dimensional compatibility with 2.8mm ID and 5.5mm OD ensuring perfect fit for M2.5 fasteners in metric assemblies
• Exceptional mechanical strength with Rockwell C35 hardness providing reliable performance under high stress conditions
• Industry-standard compliance with DIN 6797 specifications guaranteeing consistent quality and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting strict international regulatory requirements
• Optimized thickness range (0.3-0.5mm) allowing for proper compression while maintaining structural integrity

Professional Applications & Engineering Value

Our M2.5 external tooth lock washers deliver critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. The zinc-plated steel construction provides essential corrosion resistance while the precisely engineered external teeth create multiple biting points that dig into both the fastener head and mounting surface. This design effectively prevents rotational loosening caused by vibration, thermal cycling, and dynamic loads commonly encountered in automotive assemblies, electronic enclosures, machinery, and precision equipment. Manufactured to DIN 6797 standards, these washers ensure dimensional consistency and reliable performance in metric fastener systems, making them ideal for OEM applications and maintenance operations requiring dependable locking solutions.

Specification Summary & Compliance

This external tooth lock washer features precise dimensions of 2.8mm internal diameter and 5.5mm external diameter with thickness ranging from 0.3-0.5mm, engineered specifically for M2.5 screw sizes. Manufactured in compliance with DIN 6797 specifications for dimensional accuracy and performance requirements. The component demonstrates Rockwell C35 hardness for optimal mechanical properties and meets critical environmental standards including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance with the latest SVHC updates, ensuring regulatory adherence for global industrial applications.