S-97775A330 0.256" ID x 0.51" OD ASME B18.21.1; MS35335-61 Mil. Spec. External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external tooth design that bites into mating surfaces, preventing loosening under dynamic loads
• Exceptional corrosion resistance with 410 stainless steel construction, ideal for harsh industrial environments
• Optimized dimensional accuracy with 0.256" ID precisely matching 1/4" screw requirements for perfect fit
• Enhanced durability with Rockwell C40 hardness providing excellent wear resistance and long service life
• Reliable performance assurance through compliance with ASME B18.21.1 and MS35335-61 manufacturing standards
• Environmental compliance meeting RoHS 3 and REACH regulations for safe use in regulated industries
• Consistent thickness control (0.023-0.028") ensuring uniform clamping force and reliable locking performance

Professional Applications & Engineering Value

These external tooth lock washers deliver critical vibration-resistant solutions for demanding industrial applications where fastener security is paramount. The 410 stainless steel construction provides excellent corrosion resistance while maintaining the necessary hardness (Rockwell C40) for repeated use in high-stress environments. The external tooth configuration creates multiple biting points that dig into both the fastener and mounting surface, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic loading. This makes them ideal for heavy-duty equipment, automotive assemblies, industrial machinery, and electrical enclosures where reliable fastener retention is essential for operational safety and reduced maintenance intervals. The precise 0.256" internal diameter ensures perfect compatibility with 1/4" fasteners, eliminating installation issues and providing consistent performance across production runs.

Specification Summary & Compliance

This tooth lock washer features inch system dimensions with 0.256" ID, 0.51" OD, and thickness ranging 0.023-0.028" for precise Class 2A fitment with 1/4" fasteners. Manufactured to exacting ASME B18.21.1 and MS35335-61 specifications, ensuring dimensional accuracy and performance reliability. The external tooth configuration provides maximum locking effectiveness while the 410 stainless steel material with Rockwell C40 hardness delivers optimal mechanical properties. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and regulatory acceptance for industrial applications worldwide.