S-91202A257 21.2 mm ID x 33.6 mm OD DIN 127B Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance prevents fastener loosening in high-stress applications
• Zinc-plated steel construction provides excellent corrosion protection for extended service life
• Rockwell C44 hardness rating ensures exceptional durability under heavy loads
• Precision DIN 127B compliance guarantees consistent performance and interchangeability
• Optimized split lock design creates powerful spring tension for maximum locking security
• Environmental compliance with RoHS 3 and REACH regulations for sustainable operations
• Perfect M20 screw compatibility with 21.2mm ID ensures precise fit and reliable performance

Professional Applications & Engineering Value

This M20 split lock washer delivers critical vibration-resistant performance in demanding industrial environments where fastener security is paramount. Engineered from zinc-plated steel, it provides superior corrosion resistance while maintaining the Rockwell C44 hardness necessary for heavy-duty applications. The standard split lock design creates continuous spring tension that counters rotational forces in machinery, automotive assemblies, and structural frameworks. Compliant with DIN 127B standards, this metric lock washer ensures precise dimensional accuracy (21.2mm ID, 33.6mm OD) for perfect compatibility with M20 fasteners, eliminating the risk of assembly failures and reducing maintenance costs in vibration-prone systems.

Specification Summary & Compliance

This split lock washer features precise dimensions (21.2mm ID × 33.6mm OD × 3.8-4.2mm thickness) manufactured to DIN 127B specifications for metric applications. The zinc-plated steel construction meets Rockwell C44 hardness requirements, ensuring dimensional stability and reliable performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for global industrial applications with strict environmental standards.