S-91113A033 0.512" ID x 0.883" 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 extreme dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in demanding environments
• Consistent locking performance maintained by Rockwell C44 hardness, ensuring teeth retain their bite through multiple installation cycles
• Precise dimensional compatibility with 1/2" fasteners (0.512" ID, 0.883" OD) for reliable fit and optimal force distribution
• 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 (0.037-0.045") provides ideal spring tension while accommodating surface variations

Professional Applications & Engineering Value

This 1/2" tooth lock washer delivers critical anti-loosening security for industrial applications where vibration and dynamic loads compromise fastener integrity. The internal tooth configuration creates multiple biting points that dig into both the fastener head and bearing surface, creating mechanical resistance against rotational forces. Manufactured from zinc-plated steel, these washers provide essential corrosion resistance while maintaining the Rockwell C44 hardness needed for teeth to penetrate surfaces without deformation. Engineers specify these ASME B18.21.1 compliant washers for heavy machinery, automotive assemblies, and structural applications where vibration-resistant performance is non-negotiable. The precise dimensional control ensures consistent clamping force distribution, preventing joint failure in critical connections.

Specification Summary & Compliance

This tooth lock washer features precise dimensions (ID: 0.512", OD: 0.883", Thickness: 0.037-0.045") specifically engineered for 1/2" screw size applications. Manufactured to ASME B18.21.1 standards, the washer maintains dimensional accuracy and performance consistency. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (updated through 06/14/2023, 235 SVHC), meeting international environmental and safety regulations for industrial components.