S-96551A790 0.256" ID x 0.478" OD ASME B18.21.1; MS35333-74; 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
• Exceptional durability with 410 Stainless Steel construction and Rockwell C40-50 hardness for long service life in demanding environments
• Precise dimensional control with 0.256" ID and 0.478" OD ensuring perfect fit for 1/4" screw applications
• Industry-standard compliance meeting ASME B18.21.1, MS35333-74, and NASM35333 specifications for reliable performance
• Environmental responsibility with full RoHS 3 and REACH compliance for safe use in regulated industries
• Optimized thickness (0.023-0.028") providing consistent clamping force without compromising assembly clearance
• Corrosion resistance from 410 Stainless Steel material, suitable for various industrial environments

Professional Applications & Engineering Value

These internal tooth lock washers deliver critical vibration-resistant fastening solutions for industrial applications where secure connections are paramount. The 410 Stainless Steel construction provides excellent strength and corrosion resistance, while the precisely positioned internal teeth create multiple biting points that prevent rotational loosening under continuous vibration and thermal cycling. Engineered to ASME B18.21.1 standards, these washers solve common fastening failures in machinery, automotive assemblies, and heavy equipment where vibration-induced loosening compromises safety and performance. The combination of Rockwell C40-50 hardness and precise dimensional control ensures consistent performance in high-stress applications, making them ideal for industrial locking washer requirements across multiple sectors.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 0.256" ID, 0.478" OD, and thickness range of 0.023-0.028" for 1/4" screw applications. Manufactured to exacting ASME B18.21.1, MS35333-74, and NASM35333 standards, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental safety requirements for industrial components. The 410 Stainless Steel material with Rockwell C40-50 hardness provides consistent mechanical properties and corrosion resistance for demanding applications.