S-90069A137 0.512" ID x 0.976" 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 that bites into mating surfaces to prevent loosening under dynamic loads
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding environments
- Optimal countersunk seating with 82° angle for flush mounting in tapered recess applications
- Consistent performance maintained by Rockwell C44 hardness rating ensuring dimensional stability under pressure
- Precision dimensional control with 0.512" ID and 0.976" OD for perfect fit with 1/2" fasteners
- Industry-standard compliance meeting ASME B18.21.1 specifications for reliable, predictable performance
- Environmental responsibility through RoHS 3 and REACH compliance for sustainable operations
Professional Applications & Engineering Value
These external tooth lock washers provide critical vibration-dampening solutions for industrial machinery, automotive assemblies, and heavy equipment where secure fastening is paramount. The zinc-plated steel construction offers excellent corrosion resistance while the precisely engineered 82° countersink angle ensures perfect flush mounting in tapered applications. With external tooth location design, these washers create maximum bite force against both the fastener and work surface, effectively preventing rotational loosening caused by vibration or thermal cycling. The Rockwell C44 hardness maintains tooth integrity under repeated loading cycles, making them ideal for high-stress applications in manufacturing, construction, and transportation industries where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting ASME B18.21.1 standards with dimensional specifications including 0.512" inner diameter, 0.976" outer diameter, and thickness ranging 0.037-0.045" for consistent performance with 1/2" fasteners. These countersunk tooth lock washers feature precise 82° countersink angles and external tooth configuration. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures responsible manufacturing and workplace safety standards.
