Rs123d

Direct replacement for the Zund R123 (3910747), with no modification needed. Router bit for acrylic and aluminum on Zund cutting systems with the RM-L, RM-A, RM-A QC, RM-S, or R45-s router module. 1-flute downcut bit with a 0.118 in (3.0 mm) cutting diameter on a 0.236 in (6.0 mm) shank.

Sold individually.

Direct OEM replacement

The Rs123d replaces the Zund R123 (3910747). It has a 0.236 in (6.0 mm) shank, 0.118 in (3.0 mm) cutting diameter, 0.433 in (11.0 mm) cutting length, and 1.969 in (50.0 mm) overall length. If your router runs the R123 now, the Rs123d drops straight in. Not sure? Contact us before you order.

What this bit is built for

Zund lists the R123 for acrylic and aluminum. The downcut spiral pushes chips down into the cut instead of lifting them, which leaves a clean top edge with less chipping on the face of the sheet. The 0.118 in (3.0 mm) diameter holds tighter inside corners and finer detail than the 0.157 in (4.0 mm) Rs124d.

Single O-flute, downcut

One large O-flute gives chips the most room to clear, which keeps heat down and helps stop acrylic from melting behind the bit. Because a downcut bit packs chips into the kerf, deep cuts may need a clearance pass.

Common questions

How do I know this fits my machine?

The Rs123d fits Zund RM-L, RM-A, RM-A QC, RM-S, and R45-s router modules that take the Zund R123. It has a 0.236 in (6.0 mm) shank. It is the standard version without the stop ring, so it is not for the RM-A QC ARC automatic bit changer. If you are not sure which router module you have, send us your machine model and we will confirm before you order.

What materials does it cut?

Acrylic and aluminum. If the bottom edge matters more than the top, an upcut bit is the better call. Reach out and we will help you pick the right one.

What speeds and feeds should I run?

Maximum spindle speed is 50,000 RPM. The right feed rate depends on the material, thickness, and your machine. If you need help dialing in settings, contact us. We run these machines every day.

How do I know when to replace it?

Watch the edge finish and the chips. Chipped top edges, burrs on aluminum, melted or re-welded edges on acrylic, or fine powder instead of clean chips all mean it is time for a fresh bit.

Getting the most from your cutting table

A fresh bit is a good start. But if you are going through bits faster than expected, or edge quality has become inconsistent, the bit is rarely the whole story. Spindle speed, feed rate, depth per pass, material hold-down, and machine condition all affect how long a bit lasts and how clean it cuts.

It is worth asking: When was your machine last serviced? Are your parameters dialed in for this material? Is this the right bit for what you are cutting? Could your operators use time with someone who runs these machines every day?

Flatbed Tools offers machine service, preventive maintenance, operator training, and workflow consulting. If something is not cutting right, reach out. We have probably seen it before.