Can I Perform Descaling with a 5/16″ (8mm) Flex Shaft?

Descaling pipes quickly and efficiently often means reaching for the thickest shaft you’ve got on your shelf. But what happens when your drain has so many twists and turns that a 3/8″ (10mm) or 1/2″ (12mm) shaft simply won’t make it through? In this post, we’ll dive into how you can still get the job done with lighter equipment, why it takes a little longer, and how to pick the right chains to complete the task easier.

Why Bigger Shafts Work Better

Using a larger shaft, such as a 10mm (3/8”) or even a 12mm (1/2”) shaft, is generally preferred. The reason? Larger shafts provide more torque to the chains, which means the descaling process is much quicker and more efficient. The added torque helps the chains break through the scale buildup with less effort and in less time.

When You Need to Use a Lightweight Shaft

But what if your pipe has multiple bends and tighter curves? In these situations, pushing a 10mm or 12mm shaft through can be impossible or very difficult. Your only practical option might be to use the lighter 8mm (5/16”) shaft.

While this makes the job possible, there are trade-offs. Using a lighter shaft means less torque, so descaling will take longer. You will also need to use much more aggressive chains to compensate for the lower power and effectively remove the scale.

Conclusion

Yes, you can descale pipes using a lightweight 8mm shaft, especially when pipe bends restrict access to larger shafts. Just be prepared for a slower process and make sure to equip your shaft with the right aggressive chains to get the job done.

We’ve also created a video on this topic, which you can find here.