S-96551A350 0.115" ID x 0.27" OD ASME B18.21.1; MS35333-104; NASM35333 Mil. Spec. Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through internal tooth design that bites into mating surfaces for permanent locking security
• Excellent corrosion resistance from bronze construction, ideal for harsh industrial environments and marine applications
• Optimal hardness performance with Rockwell B90 rating ensuring consistent spring action and tooth engagement
• Precise dimensional compatibility with No. 4 screws (0.115" ID x 0.27" OD) for perfect fit and maximum contact area
• Multi-standard compliance meeting ASME B18.21.1, MS35333-104, and NASM35333 for guaranteed quality and interchangeability
• Reliable reusability maintaining locking effectiveness through multiple installation cycles
• Minimal thickness variation (0.015-0.019") ensuring consistent compression and uniform load distribution

Professional Applications & Engineering Value

These bronze internal tooth lock washers provide critical vibration-resistant fastening solutions where conventional washers fail. The internal tooth configuration creates multiple biting points that dig into both the screw head and base material, preventing rotational loosening under extreme dynamic loads. Made from durable bronze material, these washers offer natural corrosion resistance without requiring additional plating or coatings, making them ideal for electrical applications, marine equipment, and chemical processing environments where galvanic corrosion is a concern. The Rockwell B90 hardness ensures the teeth maintain their sharpness and spring characteristics through repeated thermal cycles and mechanical stress. Engineered specifically for No. 4 screw applications, these precision washers deliver reliable performance in aerospace assemblies, precision instruments, and industrial machinery where vibration-induced fastener failure cannot be tolerated.

Specification Summary & Compliance

This bronze tooth lock washer features precise dimensional specifications with 0.115" internal diameter, 0.27" outer diameter, and thickness ranging from 0.015" to 0.019". Manufactured to exacting inch system standards, the washer complies with ASME B18.21.1 for tooth lock washers, MS35333-104 military specification, and NASM35333 aerospace standards. The internal tooth location provides optimal locking action while maintaining compliance with industry-recognized mechanical fastener specifications. These washers are manufactured using materials and processes that meet industry requirements for quality and performance in critical fastening applications.