S-98449A009 0.176" ID x 0.34" 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 through 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 0.176" ID and 0.34" OD providing perfect fit for No. 9 screw applications
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed performance and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices
• Reduced maintenance requirements through durable construction that maintains locking force through multiple installation cycles

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. Engineered from 400 Series Stainless Steel, it provides excellent corrosion resistance for outdoor equipment, marine environments, and chemical processing facilities. The strategically positioned internal teeth create multiple biting points that dig into both the screw head and bearing surface, effectively resisting rotational forces that cause conventional fasteners to loosen. This design is particularly valuable in vibration-prone assemblies such as machinery mounts, automotive components, and electrical enclosures where maintenance access is limited. The Rockwell C34 hardness ensures the teeth maintain their spring tension and biting capability through repeated thermal cycles and mechanical stress, making it an ideal solution for permanent installations requiring long-term reliability.

Specification Summary & Compliance

This precision internal tooth lock washer features dimensional specifications of 0.176" ID, 0.34" OD, and thickness range of 0.018-0.023" specifically designed for No. 9 screw applications. Manufactured in compliance with ASME B18.21.1 standards, it ensures consistent performance and interchangeability across industrial applications. The washer meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) compliance for chemical safety, making it suitable for global supply chains and environmentally conscious manufacturing operations.