S-91113A004 0.102" ID x 0.232" 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 dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial environments
• Precision dimensional control with 0.232" OD and 0.102" ID ensuring perfect fit for No. 3 screw applications
• Exceptional hardness performance with Rockwell C44 rating providing reliable spring action and long-term holding power
• Industry-standard compliance meeting ASME B18.21.1 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated applications
• Optimized thickness range (0.010-0.016") allowing for proper compression and surface engagement

Professional Applications & Engineering Value

These internal tooth lock washers deliver critical vibration-resistant performance in demanding mechanical assemblies where fastener security is paramount. The zinc-plated steel construction provides essential corrosion protection while maintaining the Rockwell C44 hardness necessary for effective spring action. The precisely positioned internal teeth create multiple biting points that dig into both the fastener head and mounting surface, effectively preventing rotational loosening caused by vibration, thermal cycling, or dynamic loads. Engineered specifically for No. 3 screw applications with exacting dimensional tolerances, these washers solve common assembly challenges in electrical enclosures, precision machinery, automotive components, and industrial equipment where reliable fastener retention is critical to operational safety and maintenance intervals.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 0.232" outer diameter, 0.102" inner diameter, and thickness ranging from 0.010" to 0.016". Manufactured to ASME B18.21.1 standards for dimensional consistency and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial applications worldwide. Designed specifically for use with No. 3 screw sizes in inch measurement systems.