S-96551A280 0.512" ID x 0.9" OD ASME B18.21.1; MS35333-44; NASM35333 Mil. Spec. Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through internal tooth design that bites into mating surfaces, preventing fastener loosening under dynamic loads
• Enhanced corrosion protection with cadmium-plated steel construction for extended service life in demanding industrial environments
• Consistent locking performance maintained by Rockwell C40-50 hardness rating, ensuring teeth retain their gripping capability
• Precise dimensional compatibility with 0.512" ID and 0.9" OD designed specifically for 1/2" screw applications
• Reliable compliance with ASME B18.21.1, MS35333-44, and NASM35333 standards for quality assurance in critical applications
• Optimized thickness range (0.037-0.045") provides proper compression and spring action without excessive bulk
• Durable tooth engagement with internal tooth configuration that protects teeth from damage during installation

Professional Applications & Engineering Value

This internal tooth lock washer delivers exceptional engineering value in applications where vibration-induced loosening compromises safety and performance. The cadmium-plated steel construction provides superior corrosion resistance while maintaining the necessary Rockwell C40-50 hardness for repeated use in heavy machinery, automotive assemblies, and structural frameworks. The internal tooth configuration ensures maximum surface contact and biting action without exposing teeth to external damage during installation. This 1/2 inch washer is particularly valuable in equipment subjected to constant vibration, thermal cycling, or dynamic loading conditions, where traditional flat washers fail to maintain bolt tension. The precise dimensional control and standardized compliance make it ideal for maintenance, repair, and OEM applications requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This heavy-duty tooth lock washer features inch system dimensions with 0.512" internal diameter and 0.9" outer diameter, specifically engineered for 1/2" screw size applications. The washer maintains precise thickness control between 0.037-0.045" and demonstrates consistent performance through Rockwell C40-50 hardness certification. Manufacturing and quality assurance strictly adhere to ASME B18.21.1 standards, with additional compliance to MS35333-44 and NASM35333 specifications for aerospace and military applications. The internal tooth location provides optimal locking action while meeting industry-recognized dimensional and performance requirements for reliable operation in demanding environments.