S-91113A051 1.394" ID x 1.95" OD Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial environments
• Optimized for 1 3/8" fasteners with precise 1.394" ID ensuring perfect fit and uniform load distribution
• Exceptional mechanical strength from Rockwell C44 hardness rating, maintaining tooth integrity under high stress
• Reliable locking performance with internal tooth configuration that minimizes surface marring while providing secure fastening
• Consistent dimensional accuracy with 1.95" OD and 0.060-0.064" thickness for predictable performance in assembly operations
• Global compliance ready meeting RoHS 3 and REACH standards for international industrial applications

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration-resistant performance for demanding industrial applications where fastener security is paramount. The zinc-plated steel construction provides essential corrosion protection while the precisely positioned internal teeth create multiple biting points that resist rotational forces and maintain clamp load in high-vibration environments. Engineered with Rockwell C44 hardness, these washers maintain structural integrity under extreme mechanical stress, making them ideal for heavy machinery, automotive assemblies, and industrial equipment where vibration-resistant fastening solutions prevent costly downtime and maintenance. The internal tooth design minimizes surface damage to components while ensuring reliable, long-term fastening security.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 1.394" internal diameter, 1.95" outer diameter, and 0.060-0.064" thickness range for consistent performance. The internal tooth lock washer features inch system measurements specifically engineered for 1 3/8" screw applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance for industrial supply chains.