S-91113A013 0.221" ID x 0.41" OD ASME B18.21.1 Internal-Tooth Lock Washers
Internal-Tooth Lock Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
Special Type Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance with internal teeth that bite into mating surfaces, preventing loosening under dynamic loads
- Enhanced corrosion protection through zinc plating, extending service life in demanding industrial environments
- Consistent performance with Rockwell C44 hardness ensuring reliable spring action and load distribution
- Precise dimensional fit with 0.221" ID and 0.41" OD designed specifically for No. 12 screws
- Industry-standard compliance with ASME B18.21.1 specifications for guaranteed quality and interchangeability
- Environmental responsibility through RoHS 3 and REACH compliance, meeting global regulatory requirements
- Optimized thickness range (0.020-0.027") providing proper compression and secure locking action
Professional Applications & Engineering Value
These internal tooth lock washers deliver critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. The zinc-plated steel construction provides excellent corrosion resistance while maintaining the necessary spring properties for reliable locking action. The strategically positioned internal teeth create multiple biting points that dig into both the fastener and mounting surface, effectively preventing rotation and backing out in high-vibration environments such as machinery, automotive assemblies, and electrical enclosures. Manufactured to ASME B18.21.1 standards, these washers ensure dimensional consistency and performance reliability across your production line, reducing maintenance costs and downtime associated with fastener failure.
Specification Summary & Compliance
This No. 12 tooth lock washer features precise dimensional specifications including 0.221" internal diameter, 0.41" outer diameter, and thickness range of 0.020-0.027". Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations (updated to 233 SVHC as of 01/17/2023), ensuring environmental responsibility and global market accessibility.
