S-98449A540 0.256" ID x 0.478" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Exceptional corrosion resistance from 400 Series Stainless Steel construction for long-lasting performance in harsh environments
• Precision dimensional accuracy with 0.256" ID and 0.478" OD ensuring perfect fit for 1/4" fasteners
• Enhanced durability with Rockwell C34 hardness maintaining tooth integrity through repeated assembly cycles
• Industry-standard compliance meeting ASME B18.21.1 specifications for reliable mechanical locking performance
• Environmental responsibility with full RoHS 3 and REACH compliance for safe use in regulated applications
• Optimized thickness range (0.023-0.028") providing consistent spring tension without compromising installation clearance

Professional Applications & Engineering Value

This 400 Series Stainless Steel tooth lock washer delivers critical vibration resistance in demanding industrial applications where fastener security is paramount. The internal tooth design creates multiple biting points that dig into both the fastener head and base material, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic loading conditions. Engineered to ASME B18.21.1 standards, this precision washer maintains reliable locking force in automotive assemblies, heavy equipment, electrical enclosures, and manufacturing machinery. The combination of Rockwell C34 hardness and corrosion-resistant stainless steel ensures the teeth maintain their biting capability through numerous disassembly cycles, providing long-term reliability in maintenance-intensive environments while meeting stringent environmental regulations.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 0.256" ID, 0.478" OD, and thickness range of 0.023-0.028" designed specifically for 1/4" fasteners. Manufactured in compliance with ASME B18.21.1 standards for mechanical lock washers, it ensures consistent performance and interchangeability. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations (updated 06/14/2023, 235 SVHC), confirming environmental safety and regulatory acceptance for industrial use across global markets.