S-90416A114 0.256" ID x 0.76" OD ASME B18.21.1 Internal / External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through dual internal/external teeth design prevents fastener loosening in high-stress applications
• Enhanced corrosion protection with black-oxide steel construction extends service life in demanding industrial environments
• Consistent locking performance maintained by Rockwell C40 hardness for reliable torque retention
• Precision dimensional control with 0.256" ID and 0.76" OD ensures perfect fit for 1/4" screw applications
• Industry-standard compliance with ASME B18.21.1 guarantees mechanical reliability and interchangeability
• Environmental regulation adherence through RoHS 3 and REACH compliance for global manufacturing acceptance
• Optimized thickness range (0.033-0.037") provides ideal spring tension while accommodating manufacturing tolerances

Professional Applications & Engineering Value

This heavy-duty tooth lock washer delivers exceptional engineering value in applications where vibration-induced loosening compromises assembly integrity. The unique internal/external teeth configuration creates multiple biting surfaces that dig into both the fastener and mating surface, effectively resisting rotational forces in machinery, automotive, and industrial equipment. Manufactured from black-oxide steel, these washers offer superior corrosion resistance while maintaining the necessary Rockwell C40 hardness for repeated use without deformation. The precisely engineered tooth geometry ensures maximum surface contact while minimizing material stress concentration, making these vibration resistant washers ideal for critical assemblies in manufacturing plants, transportation systems, and heavy machinery where safety and reliability are paramount.

Specification Summary & Compliance

This 1/4" tooth lock washer features inch system dimensions with 0.256" internal diameter and 0.76" outer diameter, manufactured to exacting thickness specifications between 0.033-0.037". The component fully complies with ASME B18.21.1 standards for mechanical fasteners, ensuring dimensional accuracy and performance reliability. Environmental compliance is verified through RoHS 3 (2015/863/EU) adherence and REACH (EC 1907/2006) certification current as of January 17, 2023, covering 233 Substances of Very High Concern, making these washers suitable for regulated industries and international markets.