S-94622A212 1/4"-28 x 21/32" AN4-5 Cotter Pin-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress industrial and aerospace applications.
• Corrosion-resistant cadmium-plated steel construction provides enhanced durability and longevity in harsh operating environments.
• Class 3A thread fit guarantees precise, secure fastening with minimal risk of loosening under vibration or dynamic loads.
• External hex drive and 7/16" head width allow for easy installation and high torque application with standard tools.
• Cotter pin locking mechanism offers added safety and vibration resistance, preventing unintentional disassembly in critical assemblies.
• Fine UNF thread (1/4"-28) delivers superior holding power and is ideal for applications requiring fine adjustment and high clamping force.
• AN4-5 specification compliance ensures adherence to rigorous aerospace and military standards for quality and reliability.

Professional Applications & Engineering Value

This 1/4"-28 UNF hex head screw is engineered to address critical fastening challenges in demanding sectors like aerospace, defense, and heavy machinery. The cadmium-plated steel material combats corrosion, extending service life in environments exposed to moisture and chemicals. Its fine thread design and Class 3A thread fit provide exceptional resistance to vibration loosening, a common failure point in dynamic systems. The inclusion of a cotter pin locking feature adds an extra layer of security, making it indispensable for assemblies where safety is paramount. With a high tensile strength of 120,000 psi and compliance with AN4-5 specifications, this screw delivers reliable performance in high-stress applications, reducing maintenance needs and enhancing overall system integrity.

Specification Summary & Compliance

This screw features a Class 3A thread fit for precise engagement and a UNF fine thread standard (1/4"-28). It is partially threaded with a grip length of 3/16" and overall length of 21/32". The product meets AN4-5 specifications, ensuring it adheres to established aerospace and military standards for quality and performance. Materials and manufacturing processes comply with industry requirements for reliability in critical applications.