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Intermediate sleeve FI08 (for flaring)

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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FI08 intermediate sleeve for flaring hydraulic tubes – 8 mm

Intermediate sleeve FI08 for flaring is a connection element intended for steel hydraulic tubes with an outer diameter of 8 mm. It is used in flared connection systems where the end of the tube is appropriately formed and joined with matching fittings. The sleeve works with a nut and a connector, providing support for the formed tube end during tightening of the connection. The product is used in power hydraulics, control installations, measurement systems, and for repairing small tube lines.

The FI08 designation specifies the outer diameter of the cooperating tube as 8 mm. The compact size allows this type of connection to be used in installations with limited assembly space. The sleeve should be selected together with the other elements of the appropriate flaring system.

Technical parameters of the FI08 intermediate sleeve

Product type: intermediate sleeve for tube flaring.
Size: FI08.
Outer diameter of the cooperating tube: 8 mm.
Connection type: tube, flared.
Purpose: rigid steel tubes for hydraulic installations.
Function: support for the formed flare and interaction with the nut.
Cooperating elements: matching nut, connector, and FI8 tube.
Area of application: power hydraulics, control and measurement systems.

Application of the FI08 sleeve in hydraulic installations

The FI08 sleeve is used when making connections of rigid tube lines in power hydraulic installations. Tubes with an outer diameter of 8 mm can be used in control circuits, pressure measurement installations, compact hydraulic power units, and auxiliary machine systems. The choice depends on pressure, tube wall thickness, type of medium, and required flow.

Flared connections of small tubes are used, among others, in machine tools, industrial machines, control and measurement devices, and service installations. The intermediate sleeve allows for the assembly of a detachable tube connection from appropriately selected elements.

How does the intermediate sleeve work in a flared connection?

In a flared connection, the end of the steel tube is formed using a suitable tool. The resulting flare cooperates with the sealing surface of the connector. The intermediate sleeve placed on the nut side forms a resistance element that helps transfer the clamping force to the prepared tube end.

The tightness of the connection depends on the correct execution of the flare, the cleanliness of the cooperating surfaces, and the compatibility of the sleeve, nut, and connector. The sleeve itself does not constitute a complete connection and does not replace proper tube preparation.

Selecting the FI08 sleeve for an 8 mm steel tube

The primary selection parameter is the outer diameter of the tube, which is 8 mm. Its wall thickness and the requirements for the method of forming the end must also be taken into account. Tubes with the same outer diameter can have different wall thicknesses, which affects the permissible flaring method.

The sleeve must be completed with a nut and a connector belonging to a compatible connection system. The HYDRON catalog also offers a 1/2 UNF FI8 flaring nut. However, before assembly, the compatibility of all elements in terms of connection geometry and the requirements of a given installation must be confirmed.

Flaring FI8 tubes – precision of execution

When preparing small-diameter tubes, the accuracy of the cut and the removal of burrs are particularly important. An uneven edge, unsymmetrical flare, or damaged surface can make it difficult to properly seal the connection. Before forming, check the condition of the tube and use a die intended for the selected flaring system.

The nut and sleeve must be placed on the tube in the correct order, according to the connection design. After flaring, check its shape, surface, and for any cracks. An incorrectly formed end should not be repaired by overtightening the nut.

Flaring sleeve vs. cutting ring

The FI08 intermediate sleeve is not a replacement for a cutting ring. In a flared system, the end of the tube is pre-formed, and the sleeve cooperates with the prepared flare. In contrast, in a cutting ring connection, a special ring crimps onto the outer surface of the tube during assembly. These elements require different construction solutions and should not be used interchangeably.

The described sleeve is also not for crimping hydraulic hoses. It is intended for rigid steel tubes, while crimp sleeves for flexible hoses are selected based on the construction and size of the hose and the appropriate fitting.

Assembly and leak testing of the FI08 connection

Before assembly, disconnect and safely depressurize the hydraulic installation. The tube should be positioned coaxially relative to the connector, without stress or forced deformation. The nut should be tightened according to the requirements of the used connection system.

After making the connection, the correct routing and support of the tube must be checked, especially in machines exposed to vibrations. Then, a leak test must be carried out according to the procedure applicable to the installation. Oil leaks under pressure must not be checked directly by hand.

Key advantages of the FI08 intermediate sleeve

Intended for flared connections of steel tubes.
Size matched to the outer diameter of an 8 mm tube.
Possibility of use in compact hydraulic installations.
Suitability for measurement and control systems.
Support for the formed tube end.
Interaction with an appropriately selected nut and connector.
Can be used during the assembly and repair of tube installations.

Technical specification

Parameter	Value
Product	Intermediate sleeve FI08
Size	FI08
Tube outer diameter	8 mm
Connection type	Flared
Purpose	Rigid steel tubes
Function	Flare support and interaction with the nut
Application	Power hydraulic installations

Frequently Asked Questions (FAQ)

What tube does the FI08 intermediate sleeve fit?

The FI08 sleeve is intended for flared connections of steel tubes with an outer diameter of 8 mm. The wall thickness and other connection elements' compatibility should also be checked.

Is the FI08 sleeve suitable for measurement lines?

It can be used in measurement installations using appropriately selected 8 mm flared tube connections. Permissible operating conditions depend on the parameters of the complete system.

Which nut should be chosen for the FI08 sleeve?

The nut must be compatible with the used flaring system. The HYDRON catalog includes a 1/2 UNF FI8 nut, but compatibility of the connector and all connection elements must be confirmed before assembly.