Extending Your Flex Shaft Using a Shaft-to-Shaft Connector

Sometimes your flex shaft just isn’t long enough. That’s where a shaft-to-shaft connector comes in. This simple tool lets you securely join two shafts and extend your working length without losing torque transfer.

How It Works

The process is simple:

1. Insert one shaft into each side of the connector.
2. Tighten the set screws firmly.
3. Secure them with a lock nut—this is important because vibrations could otherwise loosen the screws during use.

Once tightened, the connector ensures torque is effectively transferred from one shaft to the other, giving you the extra reach you need.

Do You Really Need the Longest Flex Shaft?

Many clients prefer the longest shaft possible. However, in practice, most blockages occur within 20 m, and clean-outs are typically spaced around 25 m apart. This means ultra-long shafts aren’t always necessary for everyday work. Of course, you know your clients’ needs best, but it’s worth keeping this in mind when choosing a shaft.

Another factor is torque. The longer the shaft, the more torque is lost through friction between the flex shaft and its sleeve—even when well-lubricated.

Why Two Shorter Shafts Might Be Better

Instead of carrying one long, heavy shaft, consider two shorter shafts and a connector:

• Less weight to carry on-site.
• Easily add extra length by connecting another shaft.
• Combine a thinner shaft with a thicker one to get both maneuverability and torque capacity.

Beyond Extensions

Some users have found creative uses for shaft-to-shaft connectors. For example, one customer connected a flex shaft to a car polisher, effectively turning it into a power source.

Important Tip: Match Shaft Sizes Correctly

When joining shafts:

• Connect the thicker shaft to the drill or power tool end.
• Connect the thinner shaft to the working/tool end.

A thicker shaft can handle more torque, while a thinner shaft pushing a thicker one can cause inefficiency or failure.

Need Help?

If you’re unsure about shaft sizes or setup, reach out—we’re happy to give advice and help you get the most out of your tools.

For a visual explanation, please check out this video.