S-98438A032 0.448" ID x 0.76" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Exceptional corrosion resistance from 400 Series Stainless Steel construction for long-lasting performance in harsh environments
• Optimized hardness (Rockwell C34) ensures teeth maintain locking force without deforming under pressure
• Precision dimensional control with 0.448" ID and 0.76" OD for perfect fit with 7/16" fasteners
• Industry-standard compliance with ASME B18.21.1 specifications for reliable, predictable performance
• Environmental regulation adherence through RoHS 3 and REACH compliance for global industrial applications
• Consistent thickness (0.032-0.040") provides uniform clamping force and reliable seating

Professional Applications & Engineering Value

These 400 Series Stainless Steel tooth lock washers deliver critical vibration resistance in demanding industrial environments where fastener security is paramount. The external tooth configuration creates multiple biting points that dig into both the fastener head and base material, effectively preventing rotation and backing out caused by machinery vibration, thermal cycling, or dynamic loading. With Rockwell C34 hardness, the teeth maintain their sharp biting edges without premature wear or deformation, ensuring consistent locking performance throughout the product lifecycle. The stainless steel construction provides excellent corrosion resistance, making these lock washers ideal for applications in chemical processing, marine equipment, food machinery, and outdoor infrastructure where environmental factors would compromise ordinary fasteners. The precise 7/16" sizing guarantees proper fitment while the standardized dimensions facilitate easy integration into existing assembly processes.

Specification Summary & Compliance

This tooth lock washer features dimensional specifications including 0.448" inner diameter, 0.76" outer diameter, and thickness ranging from 0.032" to 0.040" for consistent performance. Manufactured to ASME B18.21.1 standards, these washers ensure precise dimensional tolerances and mechanical properties. The product maintains full compliance with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) requirements, including the latest SVHC updates as of June 14, 2023, making them suitable for regulated industries and international markets.