Description
A Better Way to Connect Guide Rails

Watch this video to see how the GRC-12 auto-aligns and secures two guide rails at the same time, while eliminating the need for expensive straight-edges.
Another TSO innovation, the GRC-12 is a first-of-its-kind, self-aligning guide rail connector for use with Festool, Makita, Milwaukee, Kreg ACS, POWERTEC, WEN, and Triton brand guide rails. Before the GRC-12, aligning connected guide rails required a variety of methods and additional tools to achieve straight connections, with misalignment often difficult to detect without a long straight edge or similar tool. This issue becomes obvious too late—when gaps show up during assembly or glue-up.
The GRC-12 TSO guide rail connectors solve this problem with a completely self-contained and self-aligning design - thanks to an innovative integral keystone feature. Simply slide the GRC-12 into your guide rail T-slots and firmly tighten the M6 Mushroom Head Screws - that's it.
Because small hex wrenches can be annoying to deal with, we’ve solved that too: the included hex driver drops easily into the hex socket and is large enough not to get lost or easily overlooked.
Key Features of the GRC-12
- Connects AND aligns in one operation, with no need for secondary tools such as a level.
- Easy, fast, accurate!
- Only perfectly aligned rails can produce perfectly straight cuts.
- Unique Patent Pending design helps keep rails aligned.
- GRC-12 keeps rails aligned with it's Keystone-shaped Connector feature.
- Connected and done!
What's Included In the Box
- GRC-12 Guide Rail Connector (2)
- M6 Mushroom Head Screw, Stainless (8)
- M3 Hex Driver (1)
Technical Details
- Dimensions: 12 x .45 x .25 inches (305 x 11.5 x 6.4 mm)
- Weight: 2 oz. (60 g)
- Material: 6061-T6 aluminum, CNC machined finish
- Compatible Guide Rails: FESTOOL FS Series, MAKITA, Milwaukee, Kreg ACS, POWERTEC and Triton (not compatible with FESTOOL HK 55 Carpentry Saws including the FSK 250, FSK 420 and FSK 670; not compatible with BOSCH or DEWALT tracks)
Videos
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96 Reviews
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Much improved over Milwaukee’s version
I will mostly echo what one other reviewer said about Festool (but in this case Milwaukee). The TSO is better than the Milwaukee version which has the inferior rectangular shape mentioned in the video, but it still allows for flex like the other reviewer mentioned, so make sure you have a straight edge you can trust to check it before making your cut. That should be part of the video instructions. I would not connect tracks without a straight edge. That said, the Milwaukee just uses screws to make contact with the rail which, in my way of thinking, could damage the rail (especially if over tightened). The TSO has more surface area to spread the force necessary to secure the connectors to the guide rail, so hopefully that will avoid deforming the rail with use.
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Track Saw Connectors
Excellent product, works great. 1 piece instead of 2 like Makita.
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Self Aligning Guide Rail Connectors
Great product, super well engineered to solve a real problem with Festool original connectors that were very difficult to get proper alignment of the rail. These work really well, perfect alignment every time!!! I bought 2 sets for my many rails and found that I can still use the festool along with the GRC 12. One GRC 12 will align the track and one festool connector will work fine to lock in the rail once it is aligned. Another great TSO product!
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Track alignment
These are a great improvement on the Festool stock track joiner. They still allow the tracks to flex, but much less than the Festool version.
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Works
These things just flat out work.