S-91757A132 0.231" 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 tooth design that bites into mating surfaces to prevent loosening under dynamic loads
- Corrosion-resistant 18-8 stainless steel construction ensures long-term reliability in harsh industrial environments
- Precision dimensional control with 0.231" ID and 0.41" OD for perfect fit with No. 12 screws
- ASME B18.21.1 compliance guarantees consistent performance meeting rigorous industry standards
- Environmental regulation compliance with RoHS 3 and REACH for global manufacturing applications
- Optimized thickness range (0.020-0.027") provides proper spring tension without compromising assembly integrity
- Internal tooth configuration concentrates locking force directly under the screw head for maximum holding power
Professional Applications & Engineering Value
This internal tooth lock washer delivers critical vibration resistance in demanding mechanical systems where fastener security is paramount. The 18-8 stainless steel composition provides excellent corrosion resistance, making it ideal for outdoor equipment, marine applications, and chemical processing environments. The precisely engineered internal tooth configuration creates multiple biting points that dig into both the fastener and workpiece, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic stresses. Meeting ASME B18.21.1 specifications, these washers ensure consistent performance in assembly lines, automotive components, industrial machinery, and electrical enclosures where reliable locking action is essential for operational safety and reduced maintenance intervals.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards with inch system dimensions: 0.231" internal diameter, 0.410" outer diameter, and thickness ranging 0.020-0.027" for No. 12 screw applications. The 18-8 stainless steel construction provides mechanical durability without specific hardness rating. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for international industrial markets and restricted substance requirements.
