S-91113A031 0.384" ID x 0.692" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through internal tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial environments
• Consistent performance with Rockwell C44 hardness ensuring teeth maintain gripping capability through multiple installation cycles
• Precise dimensional compatibility with 0.384" ID and 0.692" OD designed specifically for 3/8" fasteners
• Reliable compliance with ASME B18.21.1 standards for guaranteed dimensional accuracy and performance
• Environmental responsibility through RoHS 3 and REACH compliance for use in regulated industries
• Optimized thickness range (0.032-0.040") providing ideal compression and spring action for secure joint fastening

Professional Applications & Engineering Value

These zinc-plated steel tooth lock washers deliver exceptional engineering value in applications where vibration resistance is critical. The internal tooth design creates multiple biting points that dig into both the fastener and workpiece, effectively preventing rotational loosening in high-vibration environments such as machinery, automotive assemblies, and industrial equipment. The Rockwell C44 hardness ensures the teeth maintain their sharpness and gripping capability through repeated torque cycles, while the zinc plating provides essential corrosion protection in demanding operating conditions. Engineered to ASME B18.21.1 standards, these 3/8" washers offer reliable performance in heavy-duty fastening applications where joint security cannot be compromised.

Specification Summary & Compliance

This tooth lock washer features precise dimensional specifications including 0.384" inner diameter, 0.692" outer diameter, and thickness range of 0.032-0.040" specifically designed for 3/8" fasteners. Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations (updated 06/14/2023, 235 SVHC), ensuring environmental responsibility and regulatory acceptance for industrial applications worldwide.