How to Convert an 8mm Square Shaft to a 10mm Round Bar

Need to extend the drive connection on a handle, latch or locking mechanism? The 3524 Square to Round Drive Coupling connects an 8mm square drive to a 10mm round shaft, giving you a practical option for adapting different shaft profiles.

It’s useful for custom installations where the standard square shaft arrangement doesn’t suit the distance between components.

What does the 3524 drive coupling do?

Made from glass-reinforced nylon, the 3524 coupling provides a transition between an 8mm square drive and a 10mm round shaft.

Rather than relying on a square shaft for the full length of a connection, a suitable assembly can use a round bar for part of the run.

How can you use it to extend a drive connection?

The arrangement depends on your handle or locking mechanism. For an assembly with an 8mm square drive at both ends, the proposed layout is:

8mm square drive → 3524 coupling → 10mm round bar → 3524 coupling → 8mm square drive

Before cutting or assembling any components:

• Measure the distance between the components, allowing for engagement inside each coupling.
• Check that the shaft profiles and dimensions match.
• Confirm how the shafts will be retained in the couplings.
• Check alignment and clearance so the completed assembly can turn freely.
• Test the mechanism through its full movement before putting it into service.

The coupling adapts the shaft profile. The complete assembly still needs to be suitable for the load and operation of your particular mechanism.

Where could you use a square-to-round coupling?

The 3524 is intended for coupling and converting applications involving latches, catches, L-handles and T-handles.

It may be useful when adapting an existing mechanism or planning a custom handle or locking assembly that needs a different shaft arrangement. Check the fit and fixing requirements before modifying your hardware.

Planning your installation

Start by checking the shaft size on your existing hardware and measuring the connection you need to make. Depending on the layout, you may need a coupling at each end of the round bar, along with a suitable method of retaining the components.

Not sure whether this coupling will suit your setup? Contact Co-Mac with the details of your handle, latch or locking mechanism.

Find the right drive coupling

The 3524 8mm Square to 10mm Round Drive Coupling offers a straightforward way to connect two different drive profiles.

Explore it online or talk to the Co-Mac team about the hardware you need for your next project.⠋