S-97775A521 0.195" ID x 0.41" OD ASME B18.21.1; MS35335-32 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 fastener loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in demanding industrial environments
• Precision dimensional control (0.195" ID, 0.41" OD) ensures perfect fit for No. 10 screws, eliminating installation issues
• Exceptional hardness rating (Rockwell C40) maintains tooth integrity and locking performance through repeated assembly cycles
• Industry-standard compliance with ASME B18.21.1 and MS35335-32 specifications guarantees reliable performance in critical applications
• Optimized thickness range (0.020-0.025") provides consistent clamping force while accommodating surface variations
• External tooth configuration offers maximum surface contact for superior locking compared to internal tooth designs

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration resistance in demanding industrial settings where fastener security is paramount. The zinc-plated steel construction provides essential corrosion protection while maintaining the structural integrity needed for heavy machinery, automotive assemblies, and electrical equipment applications. Engineered with precision inch dimensions specifically for No. 10 screws, the external teeth create multiple biting points that dig into both the fastener and mounting surface, effectively preventing rotation and loosening caused by vibration or thermal cycling. The Rockwell C40 hardness ensures the teeth maintain their sharpness and locking capability through numerous installation cycles, making these industrial washers ideal for maintenance-critical applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with internal diameter of 0.195", outer diameter of 0.41", and thickness ranging 0.020-0.025" for consistent performance. This external tooth lock washer complies with ASME B18.21.1 mechanical specifications and MS35335-32 military standards, ensuring precise thread engagement and reliable locking action. The zinc-plated finish provides corrosion resistance while meeting industry requirements for heavy-duty washers in mechanical and structural applications.