The 402-921 is a Piper OEM aircraft bolt used as a structural fastening component in a variety of airframe and mechanical assemblies. It is designed to provide a strong, reliable clamping connection between components while maintaining integrity under vibration, cyclic loading, and operational stresses.

In Piper aircraft applications, bolts such as the 402-921 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 secure load transfer and precise alignment between joined components.

This bolt is typically used in combination with compatible nuts, washers, and where applicable, safety devices such as cotter pins or locking features to prevent loosening during operation. Correct installation torque is essential to ensure proper joint performance and airworthiness compliance.

Manufactured to Piper OEM specifications, the 402-921 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 environments.

Because it is used in structural and potentially flight-critical applications, proper installation, torqueing, and inspection are essential to maintain safety and long-term reliability.

Key features include:

Piper 402-921 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