S-98438A220 0.141" ID x 0.32" 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, preventing loosening under dynamic loads
• Exceptional corrosion resistance from 400 Series Stainless Steel construction for long-term reliability in harsh environments
• Optimized hardness performance with Rockwell C34 rating ensuring teeth maintain locking grip without deformation
• Precision dimensional control with 0.141" ID and 0.32" OD for perfect fit with No. 6 screws
• Industry-standard compliance meeting ASME B18.21.1 specifications for consistent quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications
• Reduced maintenance requirements through durable construction that maintains locking performance through multiple installation cycles

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration-resistant fastening for demanding industrial applications where joint integrity is paramount. The 400 Series Stainless Steel construction provides excellent corrosion resistance while maintaining the necessary Rockwell C34 hardness to ensure teeth penetrate and lock effectively. The external tooth configuration creates multiple biting points that resist rotational forces in machinery, automotive assemblies, and electrical enclosures subject to constant vibration. Engineered to ASME B18.21.1 standards, this washer offers reliable performance in high-stress environments where traditional flat washers would fail, preventing costly downtime from fastener loosening. The precise 0.141" ID ensures perfect alignment with No. 6 screws, while the external teeth provide superior locking action compared to internal tooth designs.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications with 0.141" inner diameter, 0.32" outer diameter, and thickness ranging from 0.016" to 0.022". Manufactured to exacting ASME B18.21.1 standards for tooth lock washers, it ensures consistent performance and interchangeability. The washer is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (updated 06/14/2023, 235 SVHC), meeting current environmental regulations for industrial use worldwide. The Rockwell C34 hardness specification guarantees optimal tooth performance without compromising material integrity.