S-90069A115 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 zinc plating, extending service life in demanding industrial environments
- Optimized countersunk fit with 82° angle for flush mounting in tapered screw head applications
- Exceptional hardness rating of Rockwell C44 ensures minimal deformation under high clamping pressures
- Precision dimensional control with 0.195" ID and 0.354" OD for perfect No. 10 screw compatibility
- 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 zinc-plated steel external tooth lock washers deliver critical anti-vibration performance in high-stress assemblies where mechanical fastening integrity is paramount. The external tooth configuration creates multiple biting points that resist rotational forces and maintain clamp load in vibrating machinery, automotive components, and heavy equipment. The 82° countersink angle ensures seamless integration with standard countersunk fasteners while the Rockwell C44 hardness prevents tooth deformation during installation and service. Engineered for No. 10 screw applications, these washers solve common loosening issues in industrial settings where thermal cycling, impact loads, and continuous operation compromise standard fastening solutions.
Specification Summary & Compliance
Manufactured to exacting ASME B18.21.1 standards with dimensional specifications including 0.195" internal diameter, 0.354" external diameter, and 0.020-0.025" thickness range. The external tooth location and 82° countersink angle ensure proper fit and function in designated applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations confirms adherence to international substance restriction requirements for industrial components.
