S-95795A005 0.116" ID x 0.478" OD ASME B18.21.1 Internal / External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal and external teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Enhanced corrosion protection from zinc plating, extending service life in harsh industrial environments
• Reliable hardness (Rockwell C40) ensures consistent spring action and reusability without deformation
• Precise dimensional fit with 0.116" ID and 0.478" OD designed specifically for No. 4 screws
• ASME B18.21.1 compliance guarantees interchangeability and performance in demanding applications
• Environmental regulation adherence with RoHS 3 and REACH compliance for global supply chain integration
• Dual-direction locking capability through internal/external tooth design provides secure fastening from both sides

Professional Applications & Engineering Value

This zinc-plated steel tooth lock washer delivers critical vibration-resistant performance in industrial assemblies where loosening compromises safety and operational integrity. The internal/external tooth configuration creates multiple biting points that maintain clamping force in high-vibration environments such as machinery, automotive subsystems, and electrical enclosures. Manufactured to ASME B18.21.1 standards with controlled Rockwell C40 hardness, it provides predictable spring characteristics that prevent both over-compression and insufficient preload. The zinc plating offers sacrificial corrosion protection while maintaining electrical conductivity, making it suitable for grounding applications. These tooth lock washers solve common fastener failure modes in dynamic loading conditions, reducing maintenance frequency and improving equipment reliability.

Specification Summary & Compliance

This No. 4 tooth lock washer features precise dimensions of 0.116" internal diameter and 0.478" outer diameter with thickness maintained between 0.016-0.018". Manufactured in compliance with ASME B18.21.1 specifications for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations regarding substance restrictions, ensuring environmental responsibility and global market acceptance.