S-98438A210 0.115" ID x 0.26" 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 to prevent loosening under dynamic loads
• Exceptional corrosion resistance from 400 Series Stainless Steel construction for long service life in harsh environments
• Optimized mechanical strength with Rockwell C34 hardness providing reliable performance under high-stress conditions
• Precision dimensional control with 0.115" ID and 0.26" OD ensuring perfect fit for No. 4 screw applications
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed performance and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for global market acceptance
• Consistent thickness tolerance (0.012-0.018") for uniform clamping force and reliable assembly performance

Professional Applications & Engineering Value

These external tooth lock washers deliver critical vibration-resistant fastening solutions for demanding industrial applications. The 400 Series Stainless Steel construction provides excellent corrosion resistance while maintaining the mechanical properties needed for high-stress environments. The external tooth configuration creates multiple biting points that dig into both the fastener head and base material, effectively preventing rotational loosening caused by vibration, thermal cycling, or dynamic loading. This makes them ideal for precision machinery, automotive assemblies, electrical enclosures, and industrial equipment where reliable locking performance is essential. The combination of Rockwell C34 hardness and controlled thickness ensures consistent performance without material deformation, while the ASME B18.21.1 compliance guarantees dimensional accuracy and functional reliability across all installations.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications including 0.115" inner diameter, 0.26" outer diameter, and thickness ranging from 0.012" to 0.018". Manufactured to ASME B18.21.1 standards for tooth lock washers, it ensures proper fit and function with No. 4 screws. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental requirements for hazardous substance restrictions. The 400 Series Stainless Steel material combined with Rockwell C34 hardness provides the necessary mechanical properties for reliable performance in industrial fastening applications.