Inner finned tube

Inner finned tube (tube with inner surface grooves)

Steel tube that expands inner surface area and enhances heat transferability


Inner finned tube is heat transfer pipe with fins formed on the inside. Such tubes have a larger internal surface area compared to smooth pipes (formal steel pipes with a circular cross section) and possess superior heat transferability.


Finned tubes are used in applications involving the transfer of heat from a hot fluid to a colder fluid through a tube wall. The rate at which such heat transfer can occur depends on three factors: (1) the temperature difference between the two fluids; (2) the heat transfer coefficient between each of the fluids and the tube wall; and (3) the surface area to which each fluid is exposed.

By extending the surface of heat transfer tubes , inner finned tube with longitudinal ribs increases efficiency of heat transferring performance. Compared with the normal smooth tube, heat transferring coefficient of inner finned tube can be increased 3-4 times.

inner finned tube

Inner finned tube from Osaka Steel Tube

For the sake of personalized demands, customer can decide fin shape and dimensions by discussion with us.

In fact, inner finned tube is our strength. One long-time customer uses our pipes for a heat transfer device that cools insulation oil in an electrical transformer.

With first-ranked Japanese mother tube along with the experienced process of production as well as strict inspection, we are sure to provide you the best input tube, especially for heat exchanger production and all other applications.



Outside diameter19.0mm to 38.1mm
Number of fins per inchto be discussed
Fin heightto be discussed
Materialcarbon steel and alloy steel

Potential range of manufacturing

In some cases, it may be possible to work outside the potential range of manufacturing. Please feel free to contact us.

Material Quality

We fabricate with carbon steel and steel alloys as well. Please feel free to contact us about other possible materials.

We can provide outer diameter range from 19.0mm to 38.1mm. Please talk with us about fin number, fin height, etc.

Although the name is “inner fin,” the internal construction is a ribbed shape.

Product List


Inner Fin


Rifled Tube



Aluminum coat




Special Shape

Oil Pressure Tube