FJ5-40 - Textron Aviation OEM Stainless Steel Stud

FJ5-40 – Textron Aviation OEM Stainless Steel Stud

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation FJ5-40 is a genuine OEM, flight-critical exhaust stud, engineered for the high-temperature environment of the turbine engine exhaust system on the Cessna Citation 500 series. This is not a standard hardware stud; it is a precision-machined fastener fabricated from a high-temperature stainless steel or nickel-based superalloy. Its primary function is to be installed into the engine's turbine or exhaust housing, providing a secure mounting point for attaching other exhaust ducting, heat shields, or V-band clamp assemblies. The FJ5-40 is designed to maintain its tensile strength and resist corrosion and fatigue under the extreme thermal and vibratory loads of a jet engine.

Key Features

• High-Temperature Superalloy Construction: Manufactured from a high-strength, corrosion-resistant steel or a superalloy (such as A-286) that is specifically chosen for its ability to maintain its mechanical properties at the extreme temperatures of turbine exhaust gases.
• Resists Thermal Fatigue: Engineered to withstand thousands of thermal cycles—from ambient ground temperatures to incandescent red heat and back again—without stretching, cracking, or losing its critical clamping force.
• Precision Rolled Threads: Features smooth, rolled threads for maximum strength and resistance to galling and stripping, even after repeated maintenance cycles in a high-heat environment.
• Primary System Component: A key structural fastener for the integrity of the exhaust system, ensuring that all components remain securely attached and sealed, preventing dangerous leaks of superheated gas.
• Genuine Textron OEM Part: As a genuine factory component, it guarantees conformance to the exact material specifications, heat treatment processes, and quality control standards required for this flight-critical, high-temperature application.

Technical Specifications

• Part Number: FJ5-40
• Component Type: High-Temperature Exhaust System Stud
• Material: High-Temperature Corrosion-Resistant Steel / Superalloy
• Primary Function: Provides a threaded mounting stud for exhaust system components.
• Thread Specification: Proprietary to Textron Aviation engineering drawings.
• Certification: FAA Production Approval

Aircraft Compatibility

The FJ5-40 is a specific component for the turbine engine exhaust systems on the foundational models of the Cessna Citation family of business jets.

• Primary Aircraft Models:
  • Cessna Citation 500
  • Cessna Citation I (501)
  • Cessna Citation I/SP
• • Baron Series B55, E55, 58 or G58

Applications

The FJ5-40 is a critical fastener for the integrity of the engine's hot section:

• Exhaust System Assembly: The primary stud used to mount and secure sections of the engine's exhaust ducting and tailpipe.
• Heat Shield Installation: Provides the mounting point for critical heat shields that protect the surrounding airframe and other systems from the radiant heat of the exhaust.
• Engine Overhaul & Hot Section Inspection: A key hardware item that is meticulously inspected for stretching, thread damage, and corrosion during any major engine or exhaust system maintenance, and is often replaced to ensure reliability.

Why Choose FJ5-40?

The failure of an exhaust system fastener in flight can be catastrophic, leading to a high-pressure leak of incandescent gases that can quickly cause an in-flight fire or structural damage to the engine pylon and airframe. The Textron Aviation FJ5-40 is the only stud certified by the manufacturer to have the specific material properties to survive in this environment. Using a standard steel or stainless steel stud would result in rapid failure due to thermal stress and corrosion. For a component this critical to safety, there is no substitute for a genuine, fully traceable OEM part.

Order Your FJ5-40 Exhaust Studs Now

Ensure the safety and integrity of your aircraft's engine exhaust system with genuine, factory-certified OEM hardware. Visit Airparts.aero to inquire about new or serviceable FJ5-40 exhaust studs today.

The FJ5-40 stud operates in an environment where it is subjected to "creep," the tendency of a metal to slowly deform over time under high stress at elevated temperatures. The superalloy material of the FJ5-40 is specifically chosen for its high creep strength. This property is derived from its nickel-based matrix, which is strengthened by the precipitation of intermetallic phases like gamma prime (Ni3(Al,Ti)). This complex microstructure is very stable at high temperatures, resisting the dislocation slip that allows metal to deform. This ensures the stud maintains its length and the critical preload on the joint throughout its service life, preventing exhaust leaks caused by fastener relaxation.

Note: This is a flight-critical engine component. Installation must be performed by a certified A&P or AME mechanic with experience in turbine engine systems, in strict accordance with the current Textron Aviation maintenance manual. Installation often requires the use of specific high-temperature anti-seize compounds and adherence to multi-stage torque procedures.