
Tube nuts
Select a union nut matched to the tube diameter, series and fitting system.
Configuration illustration; supplied variant may differ.
Query product →Select matched F-LINE tube nuts, cutting rings and replacement seals for the supplied fitting system. Identify the original assembly and seal dimensions before ordering individual components.


Select a union nut matched to the tube diameter, series and fitting system.
Configuration illustration; supplied variant may differ.
Query product →
Select the matched cutting ring for the tube and body combination.
Configuration illustration; supplied variant may differ.
Query product →Specify the profiled seal by dimensions, material and mating port.
Identification symbol; confirm seal profile.
Query product →Specify inside diameter, cross-section, compound and application.
Identification symbol; confirm seal profile.
Query product →Identify the specific gauge, banjo or other sealing-ring arrangement.
Identification symbol; confirm seal profile.
Query product →Spare components support maintenance of identified assemblies. Replacing a seal or ring does not by itself establish that a damaged body, thread or tube is suitable for continued service.
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 →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.
Select the fitting, tube and seals as one assembly. Pressure capability depends on the exact configuration, material, tube dimensions, temperature and installation method.
Successful cutting-ring connections depend on suitable tubing, matched components, careful preparation and the correct assembly procedure for the supplied fitting system.
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.
Use them to identify and enquire about the configuration. Obtain the order-specific drawing and confirmed pressure rating before fabrication or installation.
Send the connection details and operating conditions. Fluidline can confirm the supplied configuration, availability and supporting documentation with your quotation.