S-91113A035 0.64" ID x 1.071" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal tooth design that bites into mating surfaces to prevent loosening under extreme dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction, extending service life in demanding industrial environments
• Exceptional hardness rating of Rockwell C44 ensures maintained locking force and prevents deformation under high torque applications
• Precision dimensional control with 0.64" ID and 1.071" OD for perfect fit with 5/8" fasteners, eliminating installation issues
• Industry-standard compliance with ASME B18.21.1 specifications guarantees consistent performance and interchangeability
• Environmental responsibility with full RoHS 3 and REACH compliance, meeting global regulatory requirements
• Optimized thickness range (0.042-0.050") provides reliable spring action while accommodating surface variations

Professional Applications & Engineering Value

This 5/8" internal tooth lock washer delivers critical vibration resistance in heavy machinery, automotive assemblies, and structural applications where anti-loosening performance is paramount. The zinc-plated steel construction combines corrosion resistance with the mechanical strength needed for extreme operating conditions. The internal tooth configuration concentrates locking force directly beneath the fastener head, creating superior bite that prevents back-off in high-vibration environments. Engineered to ASME B18.21.1 standards, this washer provides reliable, predictable performance in critical industrial fastening applications where safety and reliability cannot be compromised. The combination of Rockwell C44 hardness and precise dimensional control ensures consistent performance across production runs and maintenance cycles.

Specification Summary & Compliance

This heavy-duty tooth lock washer features precise dimensional specifications including 0.64" internal diameter, 1.071" outer diameter, and thickness ranging 0.042-0.050" for optimal performance with 5/8" fasteners. Manufactured to ASME B18.21.1 mechanical standards with Rockwell C44 hardness certification. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The internal tooth location design provides superior locking action while maintaining industry-standard compatibility.