S-96551A140 0.448" ID x 0.789" OD ASME B18.21.1; MS35333-77; NASM35333 Mil. Spec. Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection using 410 stainless steel construction for demanding industrial environments
• Exceptional hardness rating (Rockwell C40-50) ensures long-term performance without deformation under high stress
• Precise dimensional control with 0.448" ID and 0.789" OD for perfect fit with 7/16" fasteners
• Multiple specification compliance meeting ASME B18.21.1, MS35333-77, and NASM35333 standards for reliable performance
• Environmental regulation compliance with RoHS 3 and REACH standards for global industrial applications
• Optimized thickness range (0.032-0.040") provides consistent compression and locking force distribution

Professional Applications & Engineering Value

This 410 stainless steel internal tooth lock washer delivers critical vibration resistance in demanding applications where fastener security is paramount. The internal tooth configuration creates multiple biting points that dig into both the fastener and mating surface, effectively resisting rotational forces and preventing spontaneous loosening in machinery, heavy equipment, and automotive assemblies. Manufactured from 410 stainless steel, these washers offer excellent corrosion resistance while maintaining the Rockwell C40-50 hardness required for high-stress environments. The precise dimensional control ensures consistent performance across batch production, making these industrial washers ideal for assembly lines requiring reliable locking solutions without constant retightening maintenance.

Specification Summary & Compliance

This tooth lock washer features inch system dimensions with 0.448" ID, 0.789" OD, and thickness ranging 0.032-0.040" for 7/16" screw applications. Manufactured to exacting standards including ASME B18.21.1, MS35333-77, and NASM35333 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial distribution and use in regulated industries.