S-90069A214 0.195" ID x 0.354" 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 bite into mating surfaces to prevent loosening under dynamic loads
- Enhanced corrosion protection through black oxide steel construction for extended service life in industrial environments
- Precise countersunk seating with 82° angle for flush installation and optimal load distribution in countersunk applications
- Exceptional hardness rating of Rockwell C40 ensures dimensional stability and maintains locking performance under high stress
- Standardized dimensions (0.195" ID × 0.354" OD) provide perfect compatibility with No. 10 screws in inch-system assemblies
- Regulatory compliance with RoHS 3 and REACH standards for safe use in global industrial markets
- Proven reliability through ASME B18.21.1 specification conformance for consistent quality and performance
Professional Applications & Engineering Value
These external tooth lock washers deliver critical vibration-damping performance in demanding industrial applications where fastener security is paramount. The black oxide steel construction provides essential corrosion resistance while the precisely engineered 82° countersink angle ensures perfect flush mounting in countersunk fastener systems. The external tooth configuration creates maximum biting action into both the bearing surface and fastener head, preventing rotational loosening in high-vibration environments such as heavy machinery, automotive assemblies, and electrical enclosures. With Rockwell C40 hardness, these washers maintain their structural integrity and locking capability even under extreme mechanical stress and thermal cycling conditions.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards with dimensional specifications including 0.195" internal diameter, 0.354" outer diameter, and thickness range of 0.020-0.025" for No. 10 screw compatibility. The external tooth location and 82° countersink angle ensure precise engineering fitment. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and unrestricted use in international markets.
