S-91113A036 0.769" ID x 1.245" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Exceptional vibration resistance through internal tooth design that bites into mating surfaces, preventing loosening under dynamic loads
• Superior corrosion protection with zinc-plated steel construction, extending service life in demanding industrial environments
• Reliable hardness performance at Rockwell C44, maintaining structural integrity under high clamping pressures
• Precision dimensional control with 0.769" ID and 1.245" OD ensuring perfect fit for 3/4" fasteners
• Industry-standard compliance with ASME B18.21.1 specifications, guaranteeing consistent quality and performance
• Environmental responsibility through RoHS 3 and REACH compliance, meeting global regulatory requirements
• Optimized thickness range (0.047-0.055") providing ideal spring tension while accommodating surface variations

Professional Applications & Engineering Value

These internal tooth lock washers deliver critical vibration-resistant performance in demanding mechanical assemblies where zinc-plated steel construction provides essential corrosion protection. The precisely engineered internal tooth location creates multiple biting points that dig into both the fastener and workpiece, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic loads. This 3/4" washer solution is particularly valuable in heavy equipment, automotive subsystems, and industrial machinery where ASME B18.21.1 compliance ensures reliable performance in critical joint applications. The combination of Rockwell C44 hardness and controlled thickness maintains spring tension without compromising material integrity, making these washers ideal for high-stress bolted connections requiring long-term reliability.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 0.769" internal diameter, 1.245" outer diameter, and 0.047-0.055" thickness range. Manufactured to ASME B18.21.1 standards with Rockwell C44 hardness certification, these washers ensure consistent performance in industrial fastening applications. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest international requirements for hazardous substance restrictions.