MS20819-4J Sleeve Flared Tube Fitting is a military standard aircraft fitting component designed to provide reliable support for flared tube connections in aerospace fluid systems. Installed between the tube flare and the coupling nut, the sleeve distributes tightening loads evenly, helping to protect the tube end while ensuring a secure, leak-resistant connection.

Manufactured in accordance with the MS20819 specification, this precision-machined sleeve is intended for use with compatible AN and MS flared tube fittings. It is widely used in aircraft hydraulic, fuel, oil, lubrication, and pneumatic systems, where dependable sealing performance and resistance to vibration are critical for safe operation.

The sleeve maintains proper alignment of the tubing assembly during installation and helps preserve the integrity of the flared connection under pressure, vibration, and temperature fluctuations. Its durable construction contributes to long service life and reliable performance in demanding aerospace environments while supporting consistent sealing characteristics throughout the system.

Routine inspection should include checking for corrosion, deformation, wear, or mechanical damage. Replacing damaged sleeves during maintenance helps ensure continued system integrity and minimizes the risk of fluid leakage.

Key Features

- Part Number: MS20819-4J
- Manufacturer: Military Standard (MS) / Approved Aviation Hardware Manufacturer
- Component: Sleeve for Flared Tube Fitting
- Designed for aircraft flared tube connections
- Provides uniform load distribution and protects the tube flare during assembly
- Suitable for hydraulic, fuel, oil, lubrication, and pneumatic systems
- Precision-machined for reliable sealing and accurate tube alignment
- Manufactured to MS20819 military specification