S-91169A340 12.7 mm ID x 21.1 mm OD DIN 127B Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance prevents fastener loosening in high-stress environments
• Galvanized steel construction provides excellent corrosion protection for extended service life
• Rockwell C44 hardness rating ensures consistent spring tension and reliable locking performance
• Precision DIN 127B dimensions (12.7mm ID, 21.1mm OD) guarantee perfect fit for M12 screw applications
• Split lock design creates continuous spring action that maintains clamping force under vibration
• Environmental compliance meets RoHS 3 and REACH standards for safe industrial use
• 2.3-2.7mm thickness range provides optimal flexibility while maintaining structural integrity

Professional Applications & Engineering Value

This M12 split lock washer delivers critical vibration damping in demanding industrial applications where fastener security is paramount. The galvanized steel material provides essential corrosion resistance while maintaining the Rockwell C44 hardness required for consistent spring performance. Engineered to DIN 127B standards, this metric lock washer solves common vibration-induced loosening problems in machinery, automotive assemblies, and structural frameworks. The split design creates continuous outward pressure that compensates for thermal expansion and mechanical stress, making it ideal for M12 screw applications in manufacturing equipment, transportation systems, and heavy machinery where reliability cannot be compromised.

Specification Summary & Compliance

This split lock washer features precise dimensional specifications with 12.7mm internal diameter, 21.1mm outer diameter, and 2.3-2.7mm thickness range. Manufactured to DIN 127B standards for metric fasteners, it ensures proper fit and function with M12 screws. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety requirements for industrial components. The standard split lock washer type with Rockwell C44 hardness certification guarantees consistent performance across all production batches.