S-98438A235 0.221" ID x 0.475" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external tooth design that bites into mating surfaces, preventing loosening in high-stress applications
• Exceptional corrosion resistance with 400 Series Stainless Steel construction, ideal for harsh industrial environments
• Optimized dimensional precision with 0.221" ID and 0.475" OD ensuring perfect fit for No. 12 screw applications
• Enhanced durability and load distribution from Rockwell C34 hardness rating, maintaining performance under repeated stress
• Reliable compliance assurance meeting ASME B18.21.1 standards for consistent quality and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH adherence for global market acceptance
• Precision thickness control between 0.020-0.027" for consistent performance and reliable torque maintenance

Professional Applications & Engineering Value

This 400 Series Stainless Steel external tooth lock washer delivers critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. The strategically positioned external teeth create superior biting action that prevents rotational loosening in high-vibration environments such as automotive assemblies, heavy machinery, and electrical enclosures. Engineered with Rockwell C34 hardness, these washers maintain structural integrity under repeated stress cycles while the corrosion-resistant stainless steel composition ensures long-term reliability in harsh operating conditions. The precision 0.221" ID and 0.475" OD dimensions provide optimal contact surface area for No. 12 screw applications, distributing load evenly and preventing surface damage to sensitive components. This combination of material strength and mechanical design addresses common assembly failures caused by vibration-induced loosening.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications including 0.221" internal diameter, 0.475" outer diameter, and thickness ranging 0.020-0.027". Manufactured to meet ASME B18.21.1 standards for dimensional accuracy and performance requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. The 400 Series Stainless Steel construction combined with Rockwell C34 hardness provides consistent mechanical properties and reliable performance in industrial fastening applications.