Inner Grooved Aluminium Tube

Inner Grooved Aluminium Tube

Aluminium Inner Grooved Tube 

Aluminium inner-grooved tube also called internal toothed tube, is the lightweight and cost reduction solution for air conditioning heat exchanger, representing an attractive alternative to copper tube. The inner grooves can be straight or helical. The height range of inner grooves varies from 0.05 to 0.3mm. The higher groove, the better heat transfer performance. It is widely used in heat exchangers for household and commercial air conditioning systems.


Straight Inner-grooved TubeCompared with traditional smooth bore tubes, aluminium straight inner-grooved tubes have better heat transfer performance, with higher efficiency and more internal grooves. Different grooves depth and geometry satisfy the specific regional requirements and refrigerants in use. Additional zinc coating layers are available for increased corrosion resistance. This internally enhanced aluminium tube is mainly used for high-fin density condensers and evaporators.

Helical Inner-grooved Tube

The inner grooves with helical teeth have been optimised to improve heat transfer. The improvement in the heat transfer coefficient of the tube is two times what can be achieved with traditional smooth bore tubes. The helical inner-grooved tubes greatly increase efficiency, which achieves a more compact design of the heat exchangers and gets a reduction in refrigerant load.

Key Features of Inner Grooved Tube

  1. High heat transfer efficiency
  2. Easy to form and bend
  3. Low cost and weight
  4. Space-saving

The Specifications of Inner Grooved Tube

  OD (mm)  WT (mm)Groove Height


Tooth NumberHelix angle 


Groove top angle 


Weight per meter
Φ5.0 ~ Φ15.880.35-10.05-0.330~600~25°30°~135°
Aluminium Alloy1060, 3003, 3103, 3003N, etc.

Why Choose Aluminium Inner Grooved Tube With Zinc Coating?

Heat exchangers work in a harsh environment. Our experts strongly recommend the aluminium tube with the addition of a zinc coating. This clad layer provides the tubes with 150% increased corrosion protection and prolonged lifetime compared to that equivalent bare tube.

This zinc coating is available for smooth bore tubes and straight inner grooved tubes.



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