S-96551A300 0.769" ID x 1.245" OD ASME B18.21.1; MS35333-47; NASM35333 Mil. Spec. Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance prevents fastener loosening in high-stress environments
• Internal tooth design provides maximum bite and surface contact for secure locking
• Cadmium-plated steel construction offers excellent corrosion resistance and durability
• Rockwell C40-50 hardness rating ensures long-term performance under heavy loads
• Precision dimensional control (0.769" ID, 1.245" OD) guarantees perfect fit for 3/4" fasteners
• Multiple military and industrial certifications (ASME B18.21.1, MS35333-47, NASM35333) ensure reliability
• Consistent thickness tolerance (0.047-0.055") provides uniform clamping force distribution

Professional Applications & Engineering Value

This 3/4" internal tooth lock washer delivers critical vibration resistance in demanding industrial applications where fastener security is paramount. The cadmium-plated steel construction provides superior corrosion protection in harsh environments, while the precisely engineered internal tooth configuration creates multiple biting points that dig into both the fastener and mating surface. This design prevents rotational movement and maintains clamping force in heavy machinery, automotive assemblies, and structural applications where thermal cycling and dynamic loads challenge conventional fastening solutions. The washer's Rockwell C40-50 hardness ensures teeth maintain their bite without deformation, providing reliable performance in high-torque applications and critical connections where failure is not an option.

Specification Summary & Compliance

This tooth lock washer features inch system dimensions with 0.769" internal diameter, 1.245" outer diameter, and controlled thickness between 0.047-0.055". Manufactured to exacting ASME B18.21.1 standards with additional compliance to military specifications MS35333-47 and NASM35333. The cadmium plating meets industry standards for corrosion protection while maintaining dimensional precision for reliable performance in critical fastening applications.