S-91233A113 0.168" ID x 0.381" 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
• Enhanced durability with Rockwell C40 hardness providing excellent wear resistance and long service life
• Corrosion-resistant black oxide finish protects against rust in demanding industrial environments
• Precision dimensional control with 0.168" ID and 0.381" OD ensuring perfect fit for No. 8 screw applications
• Industry-standard compliance with ASME B18.21.1 specifications guaranteeing consistent performance and reliability
• Environmental responsibility through RoHS 3 and REACH compliance for safe industrial usage
• Optimal torque transmission with external tooth configuration that distributes load evenly across the fastener assembly

Professional Applications & Engineering Value

These external tooth lock washers deliver exceptional engineering value in applications where vibration-induced loosening poses significant reliability concerns. The black oxide steel construction combined with precise external tooth location creates a mechanical locking action that maintains clamp force in high-vibration environments such as heavy machinery, automotive assemblies, and industrial equipment. The Rockwell C40 hardness ensures the teeth maintain their biting capability through repeated stress cycles, while the specific dimensional configuration (0.168" ID, 0.381" OD) provides optimal surface contact for No. 8 screw applications. This combination of material properties and geometric design addresses common fastener failure modes, offering engineers a reliable solution for critical joints where maintenance access is limited and failure consequences are severe.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications including 0.168" internal diameter, 0.381" outer diameter, and thickness ranging from 0.018" to 0.023". Manufactured to ASME B18.21.1 standards for tooth lock washers, ensuring consistent quality and performance. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety requirements for industrial components. Designed specifically for use with No. 8 screw sizes in inch system applications.