S-93925A429 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 to prevent loosening under dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in harsh environments
• Precise dimensional accuracy with 21mm ID and 33mm OD ensuring perfect fit for M20 screw applications
• Exceptional mechanical strength with Rockwell C42 hardness providing reliable performance under high stress conditions
• Guaranteed compliance with DIN 6797 standards for consistent quality and interchangeability in industrial assemblies
• Optimized thickness range (1.2-1.5mm) delivering ideal spring tension while accommodating surface variations
• Environmental responsibility with full RoHS 3 and REACH compliance for safe use across regulated industries

Professional Applications & Engineering Value

This M20 internal tooth lock washer delivers critical engineering solutions for vibration-prone applications where joint integrity is paramount. The zinc-plated steel construction provides essential corrosion resistance while maintaining the Rockwell C42 hardness required for repeated loading cycles. The precisely positioned internal teeth create superior biting action that prevents back-off in machinery, automotive assemblies, and heavy equipment subjected to constant vibration and thermal cycling. Manufactured to DIN 6797 specifications, these metric lock washers ensure dimensional consistency for M20 fastening systems, eliminating the need for retorquing and reducing maintenance downtime in industrial operations.

Specification Summary & Compliance

This internal tooth lock washer features precise 21mm ID and 33mm OD dimensions with 1.2-1.5mm thickness, engineered to DIN 6797 standards for dimensional accuracy and performance reliability. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance across industrial sectors. The zinc-plated steel material combined with Rockwell C42 hardness provides consistent mechanical properties for demanding fastener applications.