S-98449A005 0.123" ID x 0.27" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Exceptional corrosion resistance provided by 400 Series Stainless Steel construction for long-term reliability in harsh environments
• Optimized hardness performance with Rockwell C34 rating ensuring consistent spring action and tooth engagement
• Precision dimensional control with 0.123" ID and 0.27" OD for perfect fit with No. 4 screws
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed performance and interchangeability
• Environmental regulation adherence with full RoHS 3 and REACH compliance for global market acceptance
• Consistent thickness tolerance between 0.012-0.018" ensuring reliable performance across production batches

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration resistance in demanding mechanical assemblies where No. 4 screws require secure fastening. The 400 Series Stainless Steel construction provides excellent corrosion resistance while maintaining the necessary spring properties at Rockwell C34 hardness. The internal tooth configuration concentrates biting force directly under the screw head, creating superior resistance to rotational loosening in high-vibration environments such as motors, pumps, and precision equipment. Engineered to ASME B18.21.1 standards, this tooth lock washer ensures predictable performance and reliable service life in industrial applications where fastener integrity is non-negotiable. The combination of material strength, precise dimensional control, and regulatory compliance makes this component ideal for OEM manufacturing and maintenance applications requiring dependable vibration-resistant solutions.

Specification Summary & Compliance

This tooth lock washer features inch system dimensions with 0.123" internal diameter and 0.27" outer diameter, specifically designed for No. 4 screw sizes. Manufactured to ASME B18.21.1 specifications with thickness maintained between 0.012-0.018" for consistent performance. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental standards for hazardous substance restrictions. Material certification confirms 400 Series Stainless Steel composition with hardness verified at Rockwell C34, ensuring mechanical properties align with industry requirements for lock washer applications.