#4 Tube Sleeve - Steel

The #4 Tube Sleeve - Steel by FRAGOLA is a precision-engineered hydraulic fitting component designed for high-pressure fluid systems that demand reliability and durability. This tube sleeve assembly accommodates 1/4-inch tubing and operates at 4 AN (Aircraft Nanometer) specifications, making it an essential component for professionals building or maintaining hydraulic brake lines, fuel systems, and power steering applications. Whether you're restoring a classic vehicle, assembling custom hydraulic circuits, or performing preventative maintenance on industrial equipment, this fitting delivers the dependability required in mission-critical applications.

Constructed from steel and finished with cadmium plating, the #4 Tube Sleeve - Steel provides superior corrosion resistance and extended service life in demanding environments. The cadmium coating protects the base steel from rust and oxidation while maintaining dimensional stability under thermal cycling and pressure fluctuations typical of hydraulic systems. The tube sleeve compresses securely around 1/4-inch tubing to create a leak-free seal when paired with compatible AN fittings, eliminating the need for sealant compounds. Its compact design—measuring just 1.05 inches in diameter and 4.25 inches in length—allows installation in tight spaces without sacrificing strength or reliability.

Experienced mechanics, fabricators, and restoration specialists rely on FRAGOLA tube sleeves for automotive, marine, and aerospace projects where fitting integrity directly impacts safety. This individual sleeve (sold as one piece) integrates seamlessly with AN-standard hose fittings and tubing systems, offering straightforward installation without specialized tools beyond basic wrenches. Stock this component for emergency repairs, system upgrades, or batch assembly projects to ensure you have backup sleeves on hand when pressure-test failures or accidental damage require quick replacement.