S-96551A290 0.64" ID x 1.071" OD ASME B18.21.1; MS35333-46; NASM35333 Mil. Spec. 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 cadmium plating, extending service life in demanding industrial environments
• Consistent performance with Rockwell C40-50 hardness ensuring dimensional stability and reliable locking force
• Precision fit for 5/8" fasteners with 0.64" ID and 1.071" OD dimensions for optimal load distribution
• Industry-standard compliance meeting ASME B18.21.1, MS35333-46, and NASM35333 specifications for quality assurance
• Optimized thickness range (0.042-0.050") providing flexibility while maintaining structural integrity
• Durable steel construction offering excellent strength-to-weight ratio for heavy-duty applications

Professional Applications & Engineering Value

These internal tooth lock washers solve critical fastening challenges in vibration-prone environments where standard washers fail. The cadmium-plated steel construction provides superior corrosion resistance while maintaining the necessary Rockwell C40-50 hardness for consistent performance. The internal tooth design creates a positive locking action that bites into both the fastener and workpiece, effectively resisting rotational forces and vibration-induced loosening. Ideal for industrial machinery, automotive assemblies, and heavy equipment where secure fastening is paramount, these washers deliver reliable performance in inch-system applications requiring ASME B18.21.1 compliance. The precise dimensional control ensures proper fit and optimal load distribution across the 5/8" fastener interface.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with 0.64" internal diameter and 1.071" outer diameter, these internal tooth lock washers maintain tight thickness tolerances between 0.042-0.050". The cadmium-plated steel construction meets Rockwell C40-50 hardness requirements for consistent performance. Fully compliant with ASME B18.21.1 standards and equivalent military specifications MS35333-46 and NASM35333, ensuring interchangeability and reliability in critical applications. The internal tooth configuration provides superior locking performance while maintaining compliance with industry-recognized engineering standards for quality and safety.