S-97775A528 0.641" ID x 1.07" OD ASME B18.21.1; MS35335-39 Mil. Spec. External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial environments
• Exceptional hardness rating of Rockwell C40 ensures teeth maintain locking force without deformation under high stress
• Precision dimensional control with 0.641" ID and 1.07" OD for perfect fit with 5/8" fasteners
• Industry-standard compliance with ASME B18.21.1 and MS35335-39 specifications guarantees reliable performance
• Optimized thickness range (0.042-0.050") provides ideal compression characteristics for secure fastening
• External tooth configuration offers maximum surface contact for superior locking action compared to internal tooth designs

Professional Applications & Engineering Value

This 5/8" external tooth lock washer addresses critical vibration-induced loosening challenges in heavy machinery, automotive assemblies, and structural applications. The zinc-plated steel construction provides essential corrosion resistance while maintaining the Rockwell C40 hardness required for teeth to effectively embed into mating surfaces. The external tooth design creates multiple biting points that resist rotational forces, making it ideal for high-vibration environments where conventional washers fail. Engineered to ASME B18.21.1 standards and military specification MS35335-39, this washer delivers predictable performance in critical industrial fastening applications where safety and reliability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional tolerances with 0.641" internal diameter and 1.07" outer diameter specifically for 5/8" screw applications. The washer features external tooth configuration with thickness ranging 0.042-0.050" and meets all requirements of ASME B18.21.1 standard and MS35335-39 military specification. The zinc-plated finish provides corrosion protection while maintaining the structural integrity required for industrial applications. Complies with RoHS and REACH environmental directives for use in regulated industries.