The NAS1351-4-16P is an aerospace-standard socket head cap screw used in aircraft structural and mechanical assemblies where high strength, precision fit, and reliable fastening are required. It features a cylindrical head with an internal hex drive, allowing high torque installation in confined spaces.

This screw is commonly used in airframe structures, brackets, equipment mounts, and control system assemblies where vibration resistance and consistent clamp load are critical. The “-16” dash number defines the grip length, ensuring correct engagement for specific installation requirements.

Manufactured to NAS specifications, it is made from high-strength alloy steel with a cadmium-plated corrosion-resistant finish and is designed to perform reliably in demanding aviation environments with vibration, cyclic loading, and temperature variation.

Key features include:

NAS1351-4-16P socket head cap screw
Thread: 1/4-28 UNF aerospace fine thread
Internal hex (Allen) drive for high torque application
Cadmium-plated corrosion-resistant finish
High-strength alloy steel construction
Used in airframe and mechanical assemblies
Suitable for vibration and cyclic load environments
Precise grip length (-16 dash number)
Designed for structural fastening applications
Direct replacement per NAS aircraft hardware standards