S-91202A246 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
• Zinc-plated steel construction provides excellent corrosion protection for extended service life
• Rockwell C44 hardness rating ensures consistent spring action and reliable locking performance
• Precision DIN 127B compliance guarantees dimensional accuracy and interchangeability
• Optimized 12.7mm ID/21.1mm OD dimensions ensure perfect fit for M12 fasteners
• Environmental compliance meets RoHS 3 and REACH standards for safe industrial use
• 2.3-2.7mm thickness range maintains optimal spring tension under varying load conditions

Professional Applications & Engineering Value

This M12 split lock washer delivers critical vibration-dampening performance in demanding industrial applications where mechanical shock and dynamic loads threaten joint integrity. The zinc-plated steel construction provides dual protection against corrosion while maintaining the Rockwell C44 hardness necessary for consistent spring action. Engineered to DIN 127B standards, these metric lock washers prevent rotational loosening in machinery, automotive assemblies, and heavy equipment where vibration resistance is paramount. The split design creates continuous spring tension that compensates for thermal expansion and material relaxation, ensuring maintained clamp load in critical bolted connections.

Specification Summary & Compliance

This split lock washer features precise dimensions: 12.7mm internal diameter, 21.1mm outer diameter, and 2.3-2.7mm thickness range, specifically designed for M12 fastener applications. Manufactured to DIN 127B specifications with Rockwell C44 hardness for optimal spring performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial use across global markets.