Helicopter tail rotor shaft fittings are one of the most structurally demanding joints in aviation. They are constantly subjected to immense torsional stress, severe cyclical fatigue, high-frequency vibration, and extreme shock loadsfrom rotor pitch changes. The retention must be absolute and permanent to ensure flight safety. This is a non-negotiable High Strength, Permanent application.
INCURE WeldLock™ 347 Retaining Compound (Green)
The INCURE WeldLock™ 347 Retaining Compound is the definitive choice for securing tail rotor shaft fittings. It provides a superior, permanent structural bond designed to withstand the extreme dynamic forces and fatigue inherent in helicopter drivetrain components.
| Key Feature | Performance for Tail Rotor Shaft Fittings |
| High Strength, Fast Curing | Creates a monolithic, high-shear bond that resists maximum torsional loads and cyclical fatigue, permanently locking the fitting to the shaft. |
| Temperature Resistance (175∘C) | Maintains full structural integrity across the wide operational temperature range experienced by aircraft drivetrain components. |
| Ideal Gap Fill (Up to 0.15mm) | Perfectly secures standard, close-tolerance press-fit assemblies, eliminating the microscopic clearances that cause fretting and wear in critical rotating joints. |
| Core Application | Suited for securing high-load rotating elements in motors and mechanical drives, matching the severe demands of aerospace drivetrain systems. |
Application Steps: Installing Tail Rotor Shaft Fittings
For maximum structural integrity and reliable, permanent retention of the shaft fitting, follow these steps:
1. Surface Preparation (The Foundation)
- Clean: Thoroughly clean both the shaft surface and the fitting bore. Surfaces must be absolutely free of all hydraulic fluid, oil, and contaminants. Use an industrial cleaner suitable for aerospace metals (e.g., acetone or specialized solvent) and wipe dry.
- Activate (If Needed): For maximum cure speed and strength on these critical components, apply a chemical activator to the bond surfaces and allow it to flash off completely.
2. Product Application
- Apply: Apply a continuous, thin coating of WeldLock™ 347 around the full circumference of either the shaft or the internal bore of the fitting.
- Ensure Coverage: Ensure the adhesive completely wets the entire mating surface as the components slide together.
3. Assembly and Curing
- Assemble: Immediately slide or press the fitting onto the shaft. Ensure the components are fully seated and aligned correctly before the compound fixtures.
- Wipe Excess: Remove any excess adhesive visible outside the joint immediately after assembly.
- Cure: Allow the assembly to fixture before handling (typically 5 minutes). Allow a full 24 hours for the compound to reach maximum structural strength before placing the component back into service or subjecting it to testing loads.