S-98438A035 0.641" ID x 1.07" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Exceptional corrosion resistance through 400 Series Stainless Steel construction for long service life in harsh environments
• Reliable hardness performance with Rockwell C34 rating ensuring consistent spring action and tooth engagement
• Precision dimensional control with 0.641" ID and 1.07" OD providing perfect fit for 5/8" screw applications
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices
• Optimized thickness range (0.042-0.050") ensuring proper compression and spring force in various assembly scenarios

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. The 400 Series Stainless Steel construction provides excellent corrosion resistance for outdoor equipment, marine environments, and chemical processing facilities. The strategically positioned external teeth create multiple biting points that dig into both the fastener head and mating surface, effectively resisting rotational forces and maintaining clamp load in high-vibration machinery, automotive assemblies, and heavy equipment. With its Rockwell C34 hardness, this washer maintains its spring characteristics through repeated loading cycles, ensuring long-term reliability in dynamic applications where conventional flat washers would fail. The precision inch system dimensions guarantee perfect compatibility with standard 5/8" fasteners across various industrial sectors.

Specification Summary & Compliance

This tooth lock washer features precise dimensional specifications including 0.641" internal diameter, 1.07" outer diameter, and thickness ranging from 0.042" to 0.050". Manufactured to ASME B18.21.1 standards, it ensures dimensional accuracy and performance reliability for industrial applications. The washer is fully compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) environmental standards, containing no substances of very high concern above threshold limits. The external tooth configuration provides maximum locking effectiveness while the 400 Series Stainless Steel material offers consistent performance across temperature variations and corrosive conditions.