S-94622A213 1/4"-28 x 25/32" AN4-6 Cotter Pin-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with cadmium plating, extending service life in harsh industrial and aerospace environments
• Exceptional vibration resistance through the integrated cotter pin locking mechanism, preventing loosening under dynamic loads
• High-strength performance with a 120,000 psi tensile strength and Rockwell C26 hardness for reliable load-bearing in critical applications
• Precise, secure fastening ensured by the Class 3A thread fit and 1/4"-28 UNF fine threading, minimizing the risk of cross-threading
• Easy installation and removal with the standard external hex head design, compatible with common wrenches
• Optimized for safety-critical assemblies by meeting AN4-6 specifications, a recognized standard in aerospace and defense
• Versatile partial threading provides an unthreaded grip length for precise clamp load and alignment

Professional Applications & Engineering Value

This cadmium-plated steel hex head screw is engineered to solve critical fastening challenges in high-vibration and high-stress environments. The 1/4"-28 UNF fine thread and Class 3A thread fit provide superior resistance to vibrational loosening, a common failure point in machinery and aerospace structures. The inclusion of a cotter pin locking mechanism offers a redundant, mechanical lock, making it ideal for applications where safety is paramount and bolt failure is not an option. Manufactured from high-strength steel, it delivers a robust 120,000 psi tensile strength, ensuring integrity under extreme loads. Its compliance with AN4-6 specifications makes it a trusted component in aerospace control systems, industrial machinery, and heavy equipment where reliability and compliance with stringent standards are required.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF thread with a Class 3A thread fit for precision and a partial thread design. It is manufactured to meet AN4-6 specifications, ensuring adherence to recognized aerospace and industrial standards. The cadmium plating provides corrosion resistance, and the mechanical properties, including the specified tensile strength and hardness, confirm its suitability for demanding engineering applications.