S-97471A110 21 mm ID x 42 mm OD DIN 432 Tab Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance prevents fastener loosening in high-stress industrial environments
• Durable steel construction with Rockwell B50 hardness ensures long-term reliability and wear resistance
• Precise DIN 432 compliance guarantees dimensional accuracy and interchangeability in metric applications
• Optimized tab locking mechanism provides positive locking action without damaging mating surfaces
• RoHS 3 and REACH compliance meets strict environmental regulations for global industrial use
• Perfect M20 screw compatibility with 21mm ID and 42mm OD ensures proper fit and distribution of clamping force
• 1.6mm thickness with 4.5mm overall height delivers optimal spring action while maintaining compact installation profile

Professional Applications & Engineering Value

This M20 Tab Lock Washer delivers critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. Engineered to DIN 432 standards, the steel construction with Rockwell B50 hardness provides exceptional durability against cyclic loading and mechanical stress. The unique tab locking design creates positive mechanical interference that prevents rotational loosening in machinery, automotive assemblies, and heavy equipment. Unlike standard washers that rely solely on friction, the tab mechanism offers reliable locking performance without galling or damaging critical components. The metric dimensions (21mm ID, 42mm OD) ensure precise fitment for M20 fasteners while the controlled thickness maintains consistent spring tension. This makes it ideal for applications requiring repeated maintenance cycles where fastener integrity must be preserved.

Specification Summary & Compliance

Manufactured to DIN 432 specifications with precise metric dimensions: 21mm inner diameter, 42mm outer diameter, 1.6mm thickness, and 4.5mm overall height. The steel material achieves Rockwell B50 hardness for consistent mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for regulated industrial markets. Designed specifically for M20 screw applications with 6.5mm tab width for secure locking performance.