S-91113A029 0.256" ID x 0.478" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through internal tooth design that bites into mating surfaces, preventing loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial environments
• Exceptional hardness rating of Rockwell C44 ensures minimal deformation under high clamping pressures
• Precision dimensional control with 0.256" ID and 0.478" OD provides perfect fit for 1/4" fasteners
• Industry-standard compliance with ASME B18.21.1 ensures consistent performance and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance for sustainable manufacturing operations
• Optimized thickness range (0.023-0.028") allows for proper compression while maintaining structural integrity

Professional Applications & Engineering Value

These zinc-plated steel tooth lock washers deliver critical vibration resistance in demanding industrial applications where fastener security is paramount. The internal tooth configuration creates multiple biting points that dig into both the fastener and mounting surface, effectively preventing rotational loosening caused by machinery vibrations, thermal cycling, or dynamic loads. The Rockwell C44 hardness rating ensures the teeth maintain their bite without flattening, while the zinc plating provides essential corrosion protection in environments exposed to moisture, chemicals, or temperature variations. Engineered specifically for 1/4" fastening systems, these ASME B18.21.1 compliant washers are ideal for heavy machinery, automotive assemblies, electrical enclosures, and structural frameworks where reliable, long-term fastening solutions are required.

Specification Summary & Compliance

This tooth lock washer features precision dimensions with 0.256" internal diameter and 0.478" outer diameter, specifically designed for 1/4" screw applications. Manufactured to ASME B18.21.1 standards for dimensional accuracy and performance requirements. The product maintains full compliance with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) requirements as of January 17, 2023, ensuring environmental responsibility and workplace safety. The internal tooth location provides optimal locking action while the controlled thickness range of 0.023-0.028" ensures consistent performance across industrial applications.