S-97775A522 0.256" ID x 0.51" OD ASME B18.21.1; MS35335-33 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 harsh environments
• Consistent performance with Rockwell C40 hardness ensuring dimensional stability and reliable spring action
• Precise compatibility with 1/4" fasteners thanks to 0.256" ID and 0.51" OD dimensions for accurate fitment
• Industry-standard compliance meeting ASME B18.21.1 and MS35335-33 specifications for quality assurance
• Optimized load distribution from 0.023-0.028" thickness providing balanced pressure across fastened joints
• Simplified inventory management with inch system measurement aligning with North American industrial standards

Professional Applications & Engineering Value

This external tooth lock washer delivers critical anti-vibration performance in demanding industrial applications where fastener security is paramount. The zinc-plated steel construction provides essential corrosion resistance for machinery operating in humid or chemically aggressive environments, while the Rockwell C40 hardness ensures the teeth maintain their biting action through repeated stress cycles. The precisely engineered external tooth configuration creates multiple biting points that dig into both the fastener head and base material, effectively resisting rotational forces in heavy equipment, automotive assemblies, and structural frameworks. Meeting ASME B18.21.1 and MS35335-33 specifications guarantees consistent performance across production runs, making this washer an ideal choice for maintenance, manufacturing, and OEM applications requiring reliable vibration-resistant fastening solutions.

Specification Summary & Compliance

This 1/4" external tooth lock washer features precise dimensional specifications including 0.256" ID, 0.51" OD, and 0.023-0.028" thickness with manufacturing compliance to ASME B18.21.1 and military standard MS35335-33. The inch system measurement ensures compatibility with North American industrial standards, while the zinc-plated finish provides environmental protection. Material hardness is certified to Rockwell C40 for consistent performance, and the external tooth location is engineered for maximum locking effectiveness in vibration-prone applications.