S-90069A126 0.255" ID x 0.458" OD ASME B18.21.1 Countersunk External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh industrial environments
• Optimal seating performance with 82° countersink angle ensuring flush mounting with standard fastener heads
• Exceptional durability backed by Rockwell C40 hardness rating for reliable performance under high stress conditions
• Precision dimensional compatibility with 0.255" ID and 0.458" OD engineered for perfect fit with 1/4" fasteners
• Guaranteed quality assurance through compliance with ASME B18.21.1 manufacturing standards
• Environmental responsibility with full RoHS 3 and REACH compliance for safe use across global markets

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. The zinc-plated steel construction provides essential corrosion protection while maintaining the mechanical strength needed for heavy machinery, automotive assemblies, and structural frameworks. The precisely engineered 82° countersink angle ensures optimal surface contact and load distribution, preventing damage to softer materials while the external tooth configuration creates positive locking action that resists rotational forces and vibration-induced loosening. This combination of features makes it ideal for critical joints in manufacturing equipment, transportation systems, and construction applications where maintenance access is limited and reliability is non-negotiable.

Specification Summary & Compliance

Manufactured to exacting ASME B18.21.1 standards with dimensional specifications including 0.255" internal diameter, 0.458" outer diameter, and 0.022" thickness specifically engineered for 1/4" fasteners. The Rockwell C40 hardness ensures consistent performance under load while the external tooth location provides maximum locking effectiveness. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental responsibility and workplace safety across international markets.