S-90069A105 0.14" ID x 0.289" 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 through external teeth that bite into mating surfaces, preventing loosening under dynamic loads
- Enhanced corrosion protection with zinc-plated steel construction, extending service life in harsh industrial environments
- Perfect flush mounting with 82° countersink angle that matches standard screw heads for smooth surface finishes
- Exceptional durability from Rockwell C44 hardness, maintaining locking performance through repeated stress cycles
- Precision dimensional control with 0.14" ID and 0.289" OD ensuring perfect fit for No. 6 screws
- Industry-standard compliance with ASME B18.21.1 specifications for guaranteed performance and interchangeability
- Environmental responsibility through RoHS 3 and REACH compliance, meeting global regulatory requirements
Professional Applications & Engineering Value
These countersunk external tooth lock washers deliver critical vibration-resistant fastening solutions where conventional washers fail. The zinc-plated steel construction provides essential corrosion resistance for industrial machinery, automotive assemblies, and heavy equipment exposed to moisture and chemicals. The precisely engineered 82° countersink angle ensures complete flush mounting with standard screw heads, eliminating protrusions that could interfere with moving components or safety requirements. The external tooth configuration creates multiple biting points that dig into both the fastener and workpiece, maintaining clamp force despite constant vibration and thermal cycling. This makes them ideal for high-vibration applications where joint integrity is non-negotiable, from engine components to production line equipment.
Specification Summary & Compliance
Manufactured to exacting ASME B18.21.1 standards with dimensional precision including 0.14" internal diameter, 0.289" outer diameter, and controlled thickness between 0.017-0.021". The external tooth lock washer design ensures consistent performance across industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and global market accessibility.
