S-94622A215 1/4"-28 x 1 9/32" AN4-12 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 tensile strength of 120,000 psi ensures reliable performance under high-stress conditions and prevents fastener failure
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications
• Integrated cotter pin locking mechanism offers positive mechanical locking to prevent loosening from dynamic loads and vibrations
• External hex drive design allows for high-torque installation and easy removal with standard tools, improving maintenance efficiency
• Rockwell C26 hardness delivers excellent wear resistance and durability, maintaining thread integrity through repeated use
• AN4-12 specification compliance guarantees consistent quality and reliability for aerospace and demanding industrial applications

Professional Applications & Engineering Value

This 1/4"-28 UNF hex head screw is engineered to address critical fastening challenges in high-vibration and high-stress environments. The cadmium-plated steel construction provides essential corrosion protection, while the Class 3A thread fit ensures precise engagement that minimizes backlash and maintains clamping force. The partial threading design allows for optimal grip length control, and the integrated cotter pin locking feature delivers fail-safe security against rotational loosening. These characteristics make it ideal for aerospace assemblies, heavy machinery, and industrial equipment where vibration resistance and reliable performance are paramount. The combination of 120,000 psi tensile strength and Rockwell C26 hardness ensures long-term durability in demanding applications.

Specification Summary & Compliance

This fastener features 1/4"-28 UNF fine threads with Class 3A fit for precision threading applications. Manufactured to AN4-12 specifications with right-hand thread direction and external hex drive. The screw is partially threaded with a grip length of 13/16" and overall length of 1-9/32". Includes a 1/16" cotter pin hole for secure locking. Complies with relevant industrial standards for aerospace and mechanical applications.