S-96551A240 0.256" ID x 0.478" OD ASME B18.21.1; MS35333-40; NASM35333 Mil. Spec. 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 cadmium plating that provides durable surface defense in harsh industrial environments
• Exceptional hardness durability with Rockwell C40-50 rating ensuring long-term performance without deformation under high stress
• Precise dimensional compatibility with 0.256" ID and 0.478" OD engineered for perfect fit with 1/4" fasteners
• Multi-standard compliance meeting ASME B18.21.1, MS35333-40, and NASM35333 specifications for guaranteed quality and interchangeability
• Optimized load distribution through controlled thickness (0.023-0.028") that maintains consistent clamping force across the assembly
• Reliable locking performance with internal tooth design that creates positive mechanical locking without damaging soft materials

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration-resistant performance for demanding industrial applications where fastener security is paramount. Engineered from cadmium-plated steel, it provides superior corrosion resistance while maintaining consistent locking force in machinery, heavy equipment, and automotive assemblies. The internal tooth configuration ensures maximum surface contact without protrusion, making it ideal for confined spaces and sensitive material applications. With Rockwell C40-50 hardness, this washer maintains its structural integrity under repeated stress cycles, preventing the costly downtime associated with fastener failure. The precise dimensional control and compliance with multiple military and industrial standards ensure reliable performance in critical vibration-resistant applications across aerospace, defense, and heavy manufacturing sectors.

Specification Summary & Compliance

This 1/4" tooth lock washer features precise dimensional specifications including 0.256" internal diameter, 0.478" outer diameter, and 0.023-0.028" thickness range. Manufactured to exacting ASME B18.21.1 standards with additional compliance to MS35333-40 and NASM35333 military specifications. The internal tooth location provides optimal locking performance while the cadmium-plated steel construction meets industry standards for corrosion resistance and durability. All materials and manufacturing processes comply with relevant industrial specifications for consistent quality and performance in professional applications.