S-98449A029 0.267" ID x 0.478" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Exceptional corrosion resistance provided by 400 Series Stainless Steel construction for long service life in harsh environments
• Optimized holding power with Rockwell C34 hardness, ensuring teeth maintain their grip without deforming under pressure
• Precision dimensional fit with 0.267" ID and 0.478" OD, designed specifically for secure 1/4" screw applications
• Industry-standard compliance with ASME B18.21.1 specifications, guaranteeing consistent performance and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting strict regulatory requirements
• Reduced maintenance frequency thanks to durable construction that withstands repeated assembly/disassembly cycles

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration-resistant fastening for demanding industrial applications where safety and reliability are paramount. The 400 Series Stainless Steel construction provides excellent corrosion resistance in environments exposed to moisture, chemicals, or temperature variations, while the Rockwell C34 hardness ensures the internal teeth maintain their biting action without shearing or deforming. The precisely engineered internal tooth configuration creates multiple contact points that dig into both the screw head and mating surface, effectively preventing rotational loosening in machinery, automotive assemblies, electrical enclosures, and structural frameworks subject to constant vibration or thermal cycling. This engineered solution eliminates the need for additional locking mechanisms, streamlining assembly while providing long-term fastening security in critical connections.

Specification Summary & Compliance

This precision internal tooth lock washer features dimensional specifications of 0.267" ID, 0.478" OD, and thickness ranging 0.023-0.028", engineered specifically for 1/4" screw applications. Manufactured in compliance with ASME B18.21.1 standards for tooth lock washers, ensuring proper tooth configuration, material properties, and performance characteristics. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and substance restriction requirements for industrial use across global markets.