Straight unions
Join equal tube sizes in a straight run.
Configuration illustration; supplied variant may differ.
Query product →F-LINE · HYDRAULIC SYSTEMS & FITTINGS
F-LINE DIN 2353 Tube-to-tube fittings
Connect, branch, reduce or route metric hydraulic tube with F-LINE unions, elbows, tees, crosses and bulkhead fittings. Specify the tube outside diameter and LL, L or S series at every connection.
DIN 2353 · 24° cone
Choose a configuration
Union elbows
Turn an equal-size tube run through 90 degrees.
Configuration illustration; supplied variant may differ.
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Union tees
Create a branch with three equal tube connections.
Configuration illustration; supplied variant may differ.
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Union crosses
Connect four tube lines at a cross junction.
Configuration illustration; supplied variant may differ.
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Reducing unions
Join two different tube diameters in line.
Configuration illustration; supplied variant may differ.
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Reducing tees
Reduce the branch or a run connection; state all three sizes.
Configuration illustration; supplied variant may differ.
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Bulkhead unions
Pass a tube connection through a panel with a mounting nut.
Configuration illustration; supplied variant may differ.
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Weld bulkhead unions
Use an extended body for a welded bulkhead connection.
Configuration illustration; supplied variant may differ.
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Bulkhead union elbows
Combine a panel-mounted connection with a 90-degree turn.
Configuration illustration; supplied variant may differ.
Query product →Where this configuration fits
Common selection tasks include hydraulic power-unit pipework, machine distribution circuits and rigid tube runs through panels. Routing, tube support and access for assembly matter as much as the fitting shape.
Details to include in your enquiry
- Identify the size and series of every tube end; reducing fittings need more than one size.
- For a tee, mark the two run ports and the branch on a simple sketch.
- For a bulkhead connection, state the mounting arrangement and available panel clearance.
- Confirm whether nuts and cutting rings are required with each body.
Sizes, materials and supplied condition
Specify the tube outside diameter, LL/L/S series, material and every connection. The overall catalogue covers 4–42 mm tube, but an individual configuration may have a narrower range. Carbon steel, 316L and 316Ti can be included in an enquiry, subject to confirmation of the supplied item.
State whether you require complete fittings or bodies only. Include working pressure, peak pressure, temperature, medium and any certificate requirements so the complete assembly can be checked.
Select materials, seals and pressure capability →Technical selection guides
DIN 2353 fitting sizes, series and thread identification
Identify a DIN 2353 connection by tube outside diameter, fitting series, thread and sealing form. A matching thread alone does not establish a correct connection.
Selecting materials, seals and pressure capability for DIN 2353 fittings
Select the fitting, tube and seals as one assembly. Pressure capability depends on the exact configuration, material, tube dimensions, temperature and installation method.
DIN 2353 fitting installation and inspection overview
Successful cutting-ring connections depend on suitable tubing, matched components, careful preparation and the correct assembly procedure for the supplied fitting system.
Questions answered
How do I specify tube-to-tube fittings?
Identify the configuration, tube diameter and series, all connection threads and seals, material, quantity and operating conditions. Send a marked sketch when port positions or different end sizes matter.
Are the catalogue dimensions suitable for final fabrication?
Use them to identify and enquire about the configuration. Obtain the order-specific drawing and confirmed pressure rating before fabrication or installation.
SPECIFY YOUR CONNECTION
Request the right fitting
Send the connection details and operating conditions. Fluidline can confirm the supplied configuration, availability and supporting documentation with your quotation.
THE COMPLETE TUBE RUN
Fittings. Tubing. Support.
Bring the whole assembly into your enquiry, from the connection and tube specification to the clamps that support the run.
Stainless steel tubing
Specify tube outside diameter, wall thickness and material with your fittings.
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Tube clamps & supports
Include the tube diameter, mounting arrangement and support requirements.
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Plan the installation
Review tube preparation, component matching and inspection before assembly.
Read the installation overview →