S-98449A535 0.221" ID x 0.41" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth design that bites into mating surfaces, preventing loosening under dynamic loads
• Exceptional corrosion resistance with 400 Series Stainless Steel construction for long-lasting performance in harsh environments
• Optimized hardness at Rockwell C34 ensures consistent spring tension and reliable locking force throughout service life
• Precision dimensional compatibility with No. 12 screws (0.221" ID, 0.41" OD) for perfect fit and maximum contact surface
• Industry-standard compliance with ASME B18.21.1 specifications guaranteeing consistent quality and performance
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries
• Thin profile design (0.020-0.027" thickness) provides effective locking in space-constrained applications

Professional Applications & Engineering Value

These 400 Series Stainless Steel internal tooth lock washers deliver critical vibration resistance in demanding industrial applications where fastener security is paramount. The internal tooth configuration creates multiple biting points that dig into both the screw head and mounting surface, effectively resisting rotational forces and maintaining clamp load in high-vibration environments like machinery, automotive assemblies, and electrical enclosures. The stainless steel construction provides excellent corrosion resistance while the controlled hardness (Rockwell C34) ensures the teeth maintain their bite without fracturing. Engineered specifically for No. 12 screws with precise dimensional tolerances, these ASME B18.21.1 compliant washers solve common loosening problems in assembly lines, reducing maintenance frequency and improving equipment reliability.

Specification Summary & Compliance

This internal tooth lock washer features dimensional specifications of 0.221" ID, 0.41" OD, and thickness range of 0.020-0.027" specifically designed for No. 12 screws. Manufactured to ASME B18.21.1 standards with Rockwell C34 hardness for consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for use in regulated industries and international markets.