S-91113A030 0.32" ID x 0.607" 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 to prevent loosening under extreme dynamic loads
• Enhanced corrosion protection through zinc plating, extending service life in demanding industrial environments
• Exceptional hardness rating (Rockwell C44) ensures teeth maintain biting action through repeated assembly cycles
• Precision dimensional control with 0.32" ID and 0.607" OD provides perfect fit for 5/16" fasteners
• Maximum clamping force retention through optimized tooth design that resists rotational and axial movement
• Industry-standard compliance with ASME B18.21.1 ensures consistent performance and interchangeability
• Environmental responsibility with full RoHS 3 and REACH compliance for global manufacturing applications

Professional Applications & Engineering Value

These zinc-plated steel tooth lock washers deliver critical anti-loosening performance in high-vibration environments where fastener security is paramount. The internal tooth configuration provides superior biting action that maintains clamping force even under severe mechanical stress and thermal cycling. Engineered to ASME B18.21.1 standards, these washers solve common industrial challenges in machinery, heavy equipment, and automotive applications where vibration-induced fastener failure can lead to costly downtime. The combination of Rockwell C44 hardness and precise dimensional control ensures reliable performance in critical assemblies, while the corrosion-resistant zinc plating extends service life in challenging operating conditions.

Specification Summary & Compliance

This 5/16" tooth lock washer features precise dimensions of 0.32" ID and 0.607" OD with thickness ranging 0.028-0.034". Manufactured to exacting ASME B18.21.1 specifications with internal tooth location for optimal performance. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental standards for industrial components. Manufactured in the inch system for compatibility with North American fastener standards.