S-96551A390 0.256" ID x 0.478" OD ASME B18.21.1; MS35333-108; 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 dynamic loads
• Excellent corrosion resistance due to bronze construction, ideal for harsh industrial environments and marine applications
• Consistent performance with Rockwell B90 hardness ensuring durability and reliable locking force over repeated use
• Precise dimensional fit with 0.256" ID designed specifically for 1/4" screws, reducing installation errors
• Compliance with major industry standards including ASME B18.21.1, MS35333-108, and NASM35333 for guaranteed quality
• Optimized tooth location with internal teeth providing maximum surface contact and secure fastening
• Dimensional stability with 0.478" OD and 0.023-0.028" thickness ensuring proper load distribution

Professional Applications & Engineering Value

These bronze tooth lock washers deliver exceptional engineering value in applications where vibration-induced loosening poses significant reliability risks. The internal tooth design creates multiple biting points that dig into both the fastener and workpiece surfaces, maintaining clamp force in high-vibration environments like heavy machinery, automotive assemblies, and electrical equipment. The bronze material offers natural corrosion resistance without requiring additional plating, making these lock washers ideal for marine, chemical processing, and outdoor applications where moisture exposure is common. With Rockwell B90 hardness, these components withstand repeated installation cycles without deformation, ensuring long-term vibration resistance while meeting critical ASME B18.21.1 specifications for industrial fastening systems.

Specification Summary & Compliance

This bronze tooth lock washer features precise inch system dimensions with 0.256" internal diameter, 0.478" outer diameter, and thickness ranging 0.023-0.028". Manufactured to exacting ASME B18.21.1 standards with additional compliance to MS35333-108 and NASM35333 specifications, ensuring dimensional accuracy and performance reliability. The internal tooth configuration provides optimal locking action for 1/4" screw applications. These washers meet industry-standard requirements for material composition and mechanical properties, with the bronze construction providing inherent corrosion resistance suitable for various industrial environments.