Aluminum fin wound and mechanically embedded into a helical groove ploughed into the base tube wall — for the highest fin stability and thermal transfer efficiency in our finned tube range.
G-Type, or embedded, fintube is manufactured by ploughing a helical groove 0.2–0.3 mm deep into the outside of the base tube wall. Critically, the metal is merely displaced, not removed — the displaced material is then rolled back alongside the groove as an aluminum fin is wound into it under tension, mechanically locking the fin in place without any adhesive or braze bond.
That metal-to-metal mechanical retention gives G-Type fintube the most consistent fin-to-tube wall contact of any finning process we offer, enabling operation up to 450°C with superior thermal transfer efficiency and fin stability — at an optimal cost relative to fully extruded fin.
A grooved, mechanically-locked fin process built for high-temperature stability.
A 0.2–0.3 mm helical groove is ploughed into the tube wall, displacing rather than removing metal.
The displaced metal is rolled back alongside the groove, forming the retention lip for the fin foot.
An aluminum fin strip is wound helically into the groove under controlled tension.
The fin foot is embedded and mechanically locked into the groove by the rolled-back metal.
Fin height, density, and mechanical retention are verified against specification.
Precision grooving and winding hardware for a mechanically locked fin.
Ploughs the precision helical groove into the base tube wall.
Winds the aluminum fin strip into the groove under consistent tension.
Fin material sized and prepared for the groove profile.
Rolls the displaced tube metal back over the fin foot for mechanical lock.
Verifies fin height, pitch, and groove depth against specification.
Confirms fin retention strength on sample lengths from every production run.
High-temperature finned tube for refinery and gas treatment air coolers.
Stable, high-temperature fin performance for power and steel process cooling.
Reliable fin retention for HVAC and compressor cooling duty.