A true bimetallic fin tube: an aluminium or copper sleeve is extruded onto the base tube under pressure, so the fin and the liner stay in permanent contact without any solder, glue or filler.
How the extruded fin is formed
A softened aluminium (or copper) sleeve is fitted over the base tube and passed through three rotating extrusion rollers. The rollers simultaneously squeeze the sleeve onto the tube and raise the fins from the same material. Because the fins are formed from the sleeve that is still under compression against the base tube, the result is a strong, oxide-free thermal bond with very low contact resistance.
Product Gallery
Typical specification
| Parameter | Range |
|---|---|
| Base tube OD | 9 mm – 51 mm (3/8″ – 2″) |
| Base tube material | Carbon steel (A179, A192), stainless steel (304, 316L), copper, copper-nickel, alloy steel |
| Fin material | Aluminium 1050 / 1060 / 3003, copper |
| Fin height | 6 mm – 16 mm |
| Fin pitch | 2.3 mm – 4.5 mm |
| Fin thickness | 0.25 mm – 0.5 mm |
| Tube length | Up to 12 m, or as required |
| Working temperature | Up to 250 °C (482 °F) continuous |
| Production standard | ASME SB-221, ASTM A179 / A213 base tube, customer drawings |
Why engineers choose it
- Highest heat transfer per metre among wrap-on types — the bimetallic bond does not loosen after thermal cycling.
- Fins cannot unwind or loosen in service, which keeps air-side efficiency stable for the whole life of the exchanger.
- No solder or filler metal, so the tube is suitable for food, pharmaceutical and other clean duties.
- Excellent resistance to atmospheric corrosion when the aluminium fin is left bare or epoxy-coated.
Where it is used
Air-cooled heat exchangers, fin-fan coolers, air compressors and aftercoolers, HVAC coils, refrigeration condensers, drying-kiln heaters, greenhouse heating and process air heaters.
Ordering information
Please provide the base tube standard and material, tube OD and wall thickness, fin material, fin height, fin pitch, finned length and total length, plus the quantity. If you only have a duty (kW, flow rates, inlet and outlet temperatures), send it over — our engineers will propose the fin geometry.
Request a quotation for extruded finned tubes
Tell us the tube diameter, fin height, fin pitch, materials and quantity — we reply with price and lead time within one working day.