TSO Products

GRC-12 Self-Aligning Guide Rail Connectors

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  • Sold as a kit that includes two GRC-12 connectors, eight custom screws with plunger feature for maximum attachment surface area, and a hex allen driver.
  • Unique keystone feature automatically aligns your guide rail squares--no separate straight edge needed!
  • GRC-12 Self-Aligning Guide Rail Connectors
  • GRC-12 Self-Aligning Guide Rail Connectors
  • GRC-12 Self-Aligning Guide Rail Connectors


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.
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 ball 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 Ball 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, 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)
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Warranty & Returns

TSO brand products are guaranteed for five years from date of sale against defects in materials or workmanship. Normal wear and tear and accidental damage are not covered. For any product determined to have a defect covered by this warranty, TSO Products will repair or, at its option, replace with current comparable product. Warranty requests require an RMA (return authorization number) prior to any return. Request an RMA number by contacting TSO Customer Service (
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78 Reviews

  • 2
    Self aligning guide rail machining subpar

    Posted by Ed Jensen on 9th Jan 2024

    The product is a fantastic product but the machining seems to be lacking. Way too many too marks and holes not centered - bad edge margins.

  • 3
    Wish I purchased the festool version

    Posted by cav on 7th Jan 2024

    Wish I purchased the festool version

  • 5
    Anyone who says connectors are unreliable hasn’t used the TSO version. Amazing design.

    Posted by Joel Martin on 1st Dec 2023

    TSO is a great company

  • 5

    Posted by Mark Warta on 5th Sep 2023

    Surely you should be able to provide a storage device at that price

  • 5

    Posted by Frank Ruedas on 9th Apr 2023

    After doing my research the self aligning guide rail by TSO seemed like the best option, fits great in the rail, sturdy construction, and over all great design.

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