The 402-903 is a Piper OEM aircraft bolt used as a structural fastening component in various airframe and mechanical assemblies. It provides a high-strength clamping connection designed to securely join aircraft components while maintaining alignment and load transfer under vibration, cyclic loading, and operational stresses.

In Piper aircraft applications, bolts such as the 402-903 are commonly used in airframe structures, landing gear assemblies, flight control systems, engine mounts, and equipment attachment points, depending on aircraft model configuration. Its primary function is to ensure reliable structural fastening and long-term joint integrity in critical assemblies.

This bolt is typically installed with matching nuts, washers, and where required, safety locking devices such as cotter pins or other locking mechanisms to prevent loosening under vibration and dynamic loads. Proper torque application is essential to maintain airworthiness and ensure safe operation.

Manufactured to Piper OEM specifications, the 402-903 is generally made from high-strength aircraft-grade steel or alloy steel, often finished with corrosion-resistant coatings such as cadmium or zinc plating to protect against environmental exposure and corrosion in aviation service conditions.

Because it is used in structural or flight-critical applications, correct installation, torqueing, and inspection are essential for maintaining safety and long-term reliability.

Key features include:

Piper 402-903 aircraft bolt (OEM fastener component)
Provides high-strength structural fastening
Used in airframe, landing gear, and control system assemblies
Ensures secure clamping and load transfer between components
Material: aircraft-grade steel or alloy steel
Corrosion-resistant protective coating (application dependent)
Designed for vibration and cyclic load environments
Compatible with nuts, washers, and safety locking devices
Critical for structural integrity and flight safety
Direct replacement part per Piper IPC specifications