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FI15 intermediate sleeve (for flaring)

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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FI15 intermediate sleeve for flaring hydraulic tubes

The FI15 intermediate sleeve for flaring is a steel connecting element designed for hydraulic tubes with an external diameter of 15 mm. It is used when making flared connections, where the appropriately formed tube end works with the sleeve, a nut, and a matching connector. The sleeve is made of carbon steel protected by a galvanized coating. It is used in power hydraulics, the construction of piping installations, and during repairs and modernization of machine hydraulic systems.

The FI15 designation indicates the outer diameter of the mating tube is 15 mm. The product is a component of a flared connection and should not be confused with a cutting ring or a crimp ferrule designed for crimping flexible hydraulic hoses.

Technical parameters of the FI15 intermediate sleeve

Product type: intermediate sleeve for flaring.
Size: FI15.
Outer diameter of the mating tube: 15 mm.
Material: carbon steel.
Surface protection: zinc plating.
Connection type: tubular, flared.
Intended use: steel hydraulic tubes.
Application: power hydraulics and industrial piping installations.
HYDRON product code: TUL POŚ FI 15.
Sales unit: piece.

Application of the FI15 sleeve in power hydraulics

The FI15 intermediate sleeve is used when making connections for rigid steel tubes in hydraulic systems. Elements of this type are used in agricultural, construction, and industrial machine installations, hydraulic power units, machine tools, and devices equipped with pipelines for transmitting hydraulic oil.

The product is suitable for assembling fittings for new installations and replacing connection elements during service work. A correctly selected sleeve works with a nut and connector, providing proper support for the formed tube end.

How does an FI15 tube flared connection work?

In a flared connection, the end of the steel tube is formed using an appropriate tool. The resulting flare works with the sealing surface of the connector, while the intermediate sleeve allows the nut's pressure to be transferred to the prepared tube end. A connection made this way allows for joining rigid pipelines without the need for a flexible hose.

The tightness of the connection depends on the geometry of the flare, the condition of the mating surfaces, the correct selection of parts, and proper assembly. Sleeves and nuts consistent with the specific flaring system should be used.

Carbon steel and galvanized surface

The FI15 sleeve is made of carbon steel, and its surface is protected by zinc plating. The zinc coating limits the risk of surface corrosion during storage and use in typical workshop and industrial conditions. When used in environments with increased corrosive aggressiveness, the requirements of the entire installation should be taken into account.

Selection of a sleeve for a 15 mm steel tube

The primary selection parameter is the outer diameter of the tube, which is 15 mm. The wall thickness of the line, the flaring method, and the compatibility of the sleeve with the nut and connector body must also be checked. Tubes with the same outer diameter may differ in wall thickness, so the requirements of the connection system being used should be checked before forming their ends.

The FI15 designation alone does not determine the thread type or all dimensions of the mating connector. The nut should be selected according to the design of the complete flared connection.

Flaring sleeve vs. cutting ring

Intermediate sleeves for flaring and cutting rings belong to different pipe connection systems. In a flared connection, the tube end is pre-formed, whereas in a connection with a cutting ring, the element bites onto the outer surface of the tube during assembly. These parts should not be used interchangeably without confirmation of design compatibility.

The FI15 intermediate sleeve is also not a ferrule for crimping hydraulic hoses. Crimp fittings matched to the type and diameter of the hose are used for flexible rubber lines.

Assembly of the FI15 sleeve and tube preparation

Before making the connection, check the technical condition of the tube, its outer diameter, and wall thickness. The end of the tube should be cut evenly, cleaned, and deburred. The sleeve and nut should be placed in the correct order, and then the flare should be prepared using a tool appropriate for the chosen system.

After forming the end, check its geometry and surface. Connections with a cracked, deformed, or damaged flare should not be installed. Tightening the nut should be done according to the connection system requirements. After completing the assembly, check the tightness of the installation.

Key advantages of the FI15 intermediate sleeve

Intended for flared connections of hydraulic tubes.
Fits tubes with an outer diameter of 15 mm.
Made of carbon steel.
Galvanized surface limiting corrosion.
Can be used in power hydraulics installations.
Useful during assembly and repair of pipelines.
Works with appropriately selected nuts and connectors.

Technical specification

Parameter	Value
Type	Intermediate sleeve for flaring
Size	FI15
Tube outer diameter	15 mm
Material	Carbon steel
Coating	Zinc plating
Connection type	Flared
Intended use	Steel hydraulic tubes
Product code	TUL POŚ FI 15
Sales unit	piece

Frequently Asked Questions (FAQ)

What tube does the FI15 intermediate sleeve fit?

The sleeve is designed for flared connections of steel tubes with an outer diameter of 15 mm. The wall thickness and connection system compatibility must also be checked.