S-96551A550 0.115" ID x 0.27" OD ASME B18.21.1; MS35333-70; NASM35333 Mil. Spec. Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Exceptional corrosion resistance from 410 stainless steel construction, ideal for harsh industrial environments
• Optimized dimensional accuracy with 0.115" ID and 0.27" OD ensuring perfect fit for No. 4 screw applications
• Enhanced durability and spring action maintained through Rockwell C40-50 hardness for long service life
• Full compliance with major industry standards including ASME B18.21.1, MS35333-70, and NASM35333
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global supply chain compatibility
• Precision thickness control (0.015-0.019") for consistent performance and reliable torque retention

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration-resistant performance in demanding applications where fastener security is paramount. Engineered from 410 stainless steel, it provides excellent corrosion resistance while maintaining structural integrity in harsh environments. The precisely positioned internal teeth create superior biting action that prevents rotational loosening in high-vibration machinery, electrical panels, and precision assemblies. With its Rockwell C40-50 hardness, this washer maintains spring tension and locking force through repeated thermal cycles and mechanical stress. The 0.115" ID and 0.27" OD dimensions ensure perfect compatibility with No. 4 screw applications, making it ideal for aerospace, automotive, and industrial equipment where reliable fastening is non-negotiable.

Specification Summary & Compliance

This precision tooth lock washer features dimensional specifications of 0.115" ID, 0.27" OD, and 0.015-0.019" thickness, manufactured to exacting standards for No. 4 screw applications. The component meets multiple critical specifications including ASME B18.21.1, MS35333-70, and NASM35333, ensuring interchangeability and reliability across industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental responsibility and global market acceptance. The Rockwell C40-50 hardness provides consistent mechanical performance, while the internal tooth configuration delivers maximum locking effectiveness in accordance with established engineering standards.