S-91114A030 0.32" ID x 0.61" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in industrial environments
• Consistent performance with Rockwell C40 hardness ensuring teeth maintain shape and locking force through repeated use
• Precise dimensional fit with 0.32" ID and 0.61" OD designed specifically for 5/16" fasteners
• Industry-standard compliance with ASME B18.21.1 specifications for reliable mechanical performance
• Environmental responsibility through RoHS 3 and REACH compliance for sustainable procurement
• Optimized thickness range (0.028-0.034") providing ideal compression and spring action for secure fastening

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration resistance in demanding mechanical assemblies where joint integrity is paramount. The zinc-plated steel construction provides essential corrosion protection while the precisely positioned external teeth create multiple biting points that dig into both the fastener head and base material, effectively resisting rotational forces and vibrational loosening. With Rockwell C40 hardness, the teeth maintain their aggressive locking action through numerous installation cycles, making these washers ideal for heavy machinery, automotive components, and industrial equipment subjected to constant vibration and thermal cycling. The inch-system dimensions ensure perfect compatibility with 5/16" fasteners, while the ASME B18.21.1 compliance guarantees consistent performance across industrial applications.

Specification Summary & Compliance

This washer features precise dimensional specifications including 0.32" internal diameter, 0.61" external diameter, and thickness ranging 0.028-0.034" for optimal compression. Manufactured to ASME B18.21.1 standards for tooth lock washers, it ensures reliable mechanical performance and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety requirements for industrial components. The external tooth configuration provides maximum locking effectiveness while maintaining material integrity through controlled hardness (Rockwell C40) and surface treatment.