S-90069A218 0.383" ID x 0.765" OD ASME B18.21.1 Countersunk External-Tooth Lock Washers
Countersunk External-Tooth Lock Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
Geometric Parameters
Special Type Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance with external teeth that maintain locking force under dynamic loads
- Precise countersunk seating with 82° angle for flush mounting in demanding applications
- Enhanced durability through Rockwell C40 hardened black oxide steel construction
- Reliable dimensional accuracy with 0.383" ID and 0.765" OD for perfect 3/8" screw compatibility
- Industry-standard compliance meeting ASME B18.21.1 specifications for quality assurance
- Environmental responsibility with full RoHS 3 and REACH compliance for global operations
- Optimized thickness range (0.028-0.034") providing consistent performance across applications
Professional Applications & Engineering Value
This countersunk external tooth lock washer delivers exceptional engineering value in high-vibration environments where fastener security is critical. The black oxide steel construction combined with Rockwell C40 hardness ensures long-term reliability in industrial machinery, automotive assemblies, and heavy equipment applications. The 82° countersink angle provides perfect flush mounting while the external tooth configuration creates superior bite and locking action that prevents loosening under extreme conditions. These vibration resistant washers are specifically engineered to solve common industrial fastening challenges, maintaining joint integrity in dynamic load applications where standard washers would fail.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards with precise dimensional tolerances including 0.383" internal diameter and 0.765" outer diameter. The black oxide steel construction provides corrosion resistance while maintaining Rockwell C40 hardness for optimal performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial applications. Designed specifically for 3/8" fasteners with external tooth location for maximum locking effectiveness.
