Bundy Tube, originally called the double wall low carbon steel tube, is now used to refer to single wall low carbon steel tube in many areas, because many of the application and post-processing of the tubes are very similar. This name sometimes confuses many readers.
There are very obvious characteristics of these two types of tubes, and below are some facts of each of them.
We offer both double wall Bundy tubes, and single wall welded tubes, with different surface coating for corrosion protection and long-lasting reliability for your application.
| Type | Double Wall (TDW) | Single Wall (TSW) |
| Welding Technique | Copper brazing | High frequency ERW |
| Resizing Method | Cold drawn | Cold drawn |
| Seam | 720 Degree seamless | Straight line seamed |
| Dimensional Accuracy | High | High |
| Strength | Mostly made hard | Can be soft or hard |
| Inside Clearliness | Good | Poor |
| Vibration Resistance | Strong | Poor |
| Safety against Pressure | High | Low |
| Application | Automobile brake lines, fuel lines, transmission cooler lines, power steering lines; certain hydraulic pipes, etc; | AC, refrigeration, heat exchanagers, automobile fuel lines; compressors, etc; |
| Original Surface | Copper | None (steel) |
| Surface Coating | Copper Zinc GALFAN PVF Nylon Epoxy Nickel | Zinc GALFAN PVF Nylon Epoxy Nickel |