G-Fin (Embedded Fin / Grooved Fin)
This type offers a significantly stronger mechanical bond than L-fins.
- Manufacturing Process:
- A helical groove is first cut into the base tube.
- A rectangular fin strip (without an “L” foot) is wound into this groove.
- A special rolling tool is used to deform the metal on the sides of the groove, “knocking it over” the edges of the fin strip, embedding and locking it firmly in place.
- How it Attaches: The fin is mechanically locked into the groove. It cannot unwind or loosen without the groove metal itself failing.
- Advantages:
- Excellent Bond Strength: Highly resistant to thermal cycling and vibration.
- Good Heat Transfer: The embedded contact provides a large metal-to-metal contact area, reducing thermal resistance.