S-97775A518 0.115" ID x 0.26" OD ASME B18.21.1; MS35335-29 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
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial environments
• Consistent locking performance maintained by Rockwell C40 hardness, ensuring teeth retain their bite through multiple installations
• Precision dimensional fit with 0.115" ID and 0.26" OD for perfect compatibility with No. 4 screws
• Reliable compliance assurance meeting both ASME B18.21.1 and MS35335-29 specifications for quality and performance
• Optimal thickness control (0.015-0.019") providing consistent compression and spring action for secure fastening
• External tooth configuration offering maximum surface contact and superior locking force compared to internal tooth designs

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration resistance in demanding industrial applications where secure fastening is paramount. The zinc-plated steel construction provides essential corrosion protection while maintaining the structural integrity needed for high-stress environments. With teeth positioned externally, this washer creates maximum surface contact, biting into both the fastener head and mounting surface to prevent rotational loosening - a common failure point in vibrating machinery, automotive assemblies, and electrical enclosures. The Rockwell C40 hardness ensures the teeth maintain their sharpness through repeated installation cycles, while the precise dimensional specifications guarantee perfect fitment with No. 4 screws in inch-system applications. This combination of material strength, precise engineering, and proven locking mechanism addresses the critical need for reliable fastening solutions in maintenance, manufacturing, and assembly operations.

Specification Summary & Compliance

This precision external tooth lock washer features dimensional specifications of 0.115" ID, 0.26" OD, and thickness range of 0.015-0.019" specifically engineered for No. 4 screw applications. Manufactured from zinc-plated steel with Rockwell C40 hardness, the washer complies with ASME B18.21.1 standards for tooth lock washers and meets MS35335-29 military specifications. The external tooth configuration and inch-system measurements ensure proper fit and performance in accordance with industry standards for vibration-resistant fastening systems.