S-96551A150 0.512" ID x 0.9" OD ASME B18.21.1; MS35333-78; 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
• Enhanced corrosion resistance through 410 stainless steel construction for demanding industrial environments
• Exceptional hardness and durability with Rockwell C40-50 rating to withstand high-pressure applications
• Precise dimensional compatibility with 0.512" ID and 0.9" OD ensuring perfect fit for 1/2" fasteners
• Multiple specification compliance meeting ASME B18.21.1, MS35333-78, and NASM35333 for guaranteed performance
• Environmental regulation adherence with RoHS 3 and REACH compliance for global industrial use
• Optimized thickness range (0.037-0.045") providing consistent compression and reliable locking action

Professional Applications & Engineering Value

This 410 stainless steel internal tooth lock washer delivers critical vibration resistance in high-stress assemblies where fastener security is paramount. The strategically positioned internal teeth create multiple biting points that dig into both the fastener and mating surface, effectively resisting rotational forces and vibrational loosening common in machinery, heavy equipment, and automotive applications. The Rockwell C40-50 hardness ensures the teeth maintain their bite without deformation, while the corrosion-resistant properties of 410 stainless steel make these industrial washers ideal for harsh environments where moisture, chemicals, or temperature variations would compromise ordinary fasteners. Engineered to ASME B18.21.1 standards, these washers provide reliable performance in critical assemblies where failure is not an option.

Specification Summary & Compliance

This 1/2" internal tooth lock washer features precise inch system dimensions with 0.512" internal diameter and 0.9" outer diameter, manufactured to exacting standards for consistent performance. The washer complies with ASME B18.21.1 for tooth lock washers, MS35333-78, and NASM35333 specifications, ensuring dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) adherence, making these washers suitable for regulated industries and international markets.