S-96551A320 1.019" ID x 1.637" OD ASME B18.21.1; MS35333-49; 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, preventing fastener loosening under dynamic loads
• Enhanced corrosion protection with cadmium-plated steel construction, extending service life in demanding industrial environments
• Exceptional hardness durability with Rockwell C40-50 rating, maintaining tooth integrity and locking performance under high stress
• Precision dimensional fit with 1.019" ID specifically engineered for 1" screws, ensuring optimal contact and load distribution
• Multi-standard compliance meeting ASME B18.21.1, MS35333-49, and NASM35333 specifications for reliable quality assurance
• Optimized tooth engagement with internal tooth location providing concentrated locking force directly at the screw interface
• Robust construction with 1.637" OD and 0.059-0.067" thickness, offering substantial bearing surface for heavy-duty applications

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration resistance in high-stress mechanical systems where fastener security is paramount. Engineered from cadmium-plated steel, it provides excellent corrosion protection while maintaining the structural integrity needed for industrial applications. The internal tooth location creates multiple biting points that dig into both the fastener and bearing surface, effectively preventing rotational loosening caused by machinery vibrations, thermal cycling, or dynamic loads. Particularly valuable in automotive assemblies, heavy equipment manufacturing, and aerospace applications, this 1" washer solves common engineering challenges of joint failure and maintenance downtime. The precise 1.019" ID ensures perfect fitment with standard 1" fasteners, while the generous 1.637" OD provides ample bearing surface to distribute clamp load effectively.

Specification Summary & Compliance

This internal tooth lock washer features inch system dimensions with precise internal diameter of 1.019" and outer diameter of 1.637", maintaining tight thickness tolerances between 0.059-0.067". Manufactured to exacting ASME B18.21.1 standards with additional compliance to MS35333-49 and NASM35333 military specifications. The cadmium-plated steel construction meets industry standards for corrosion resistance, while the Rockwell C40-50 hardness ensures consistent performance in demanding applications. Designed specifically for use with 1" screws, this washer provides reliable fastener security while meeting quality assurance requirements for industrial and mechanical applications.