S-90069A213 0.167" ID x 0.322" 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 tooth design prevents fastener loosening in high-stress applications
- Enhanced corrosion protection with Black Oxide Steel finish extends service life in demanding industrial environments
- Precise countersunk seating with 82° angle ensures flush mounting and optimal load distribution
- Exceptional durability backed by Rockwell C40 hardness rating for long-term performance under heavy loads
- Reliable dimensional accuracy with 0.167" ID and 0.322" OD for perfect No. 8 screw compatibility
- Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed quality and performance
- Environmental responsibility with full RoHS 3 and REACH compliance for sustainable manufacturing
Professional Applications & Engineering Value
These countersunk external tooth lock washers deliver critical engineering solutions where vibration-induced fastener failure poses significant risks. The Black Oxide Steel construction provides essential corrosion resistance while maintaining the Rockwell C40 hardness necessary for industrial durability. The precisely engineered 82° countersink angle ensures perfect flush mounting in countersunk applications, preventing surface protrusion while the external tooth configuration bites into both the bearing surface and fastener head, creating superior locking action. Ideal for machinery, automotive assemblies, and heavy equipment where vibration resistance and reliable fastening are paramount, these washers solve common industrial challenges of maintenance reduction and joint integrity preservation.
Specification Summary & Compliance
Manufactured to exact ASME B18.21.1 standards with precise dimensional specifications: Internal Diameter 0.167", External Diameter 0.322", and Thickness 0.017-0.021" for No. 8 screw applications. The countersunk external tooth lock washers feature standardized 82° countersink angle and maintain full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet the highest industry standards for quality, safety, and environmental responsibility.
