Kreg 90-Degree & 45-Degree Universal Track Saw Square (ACS4590)

The Kreg 90-Degree & 45-Degree Universal Track Saw Square (ACS4590) is a dual-angle track saw square built for fast, repeatable square cuts and miters with a guide rail. This is a track saw square designed for accurate crosscutting and 45 degree angle cuts in sheet goods, panels, and woodworking stock. Model Number: ACS4590. If you use a track saw to break down plywood, square up butcher block, or dial in repeatable furniture parts, this accessory gives you a simple reference point that speeds up the whole workflow.

The big draw here is straightforward: you get both 90 degree and 45 degree cutting positions in one tool. Instead of measuring and checking the rail over and over, you can mount the square to the track and line up cuts with more confidence. That matters when you are making repeated crosscuts on cabinet parts, trimming oversized panels, or cutting miters where a small setup error shows up fast. The wedge-mount system is there to make setup quicker and more secure, so you spend less time fiddling with alignment and more time cutting.

Kreg built this square with a precision-machined all-metal body, and that is the right call for a layout accessory that lives or dies by accuracy. A tool like this does not need gimmicks. It needs flat, consistent reference surfaces that stay true after regular shop use, transport, and setup changes. The oversized thumb screw also makes a difference in real use because it is easier to tighten firmly without tools, especially when you are moving from one cut to the next.

Another useful detail is the leveling tab. When you are working near the edge of sheet material or mounting the square in a position where support matters, the leveling tab helps keep the track flat and stable during the cut. That reduces the chance of the rail rocking or tipping, which helps the saw stay planted and the cut stay on line. It is one of those small features that matters more on a real job than it does on a spec sheet.

Compatibility is one of the strongest reasons to look at this square. It is designed to fit most major track saw systems and works with right-hand and left-hand blade saws. Kreg specifically calls out compatibility with Kreg, Festool, Makita, Milwaukee, DeWalt, Metabo, PowerTec, and more. It also works with Kreg Track Clamps, Accu-Cut, and Adaptive Cutting System Universal Tracks, which makes it a useful add-on if you are already in the Kreg cutting ecosystem but do not want to be locked into one rail setup.

Who is this for? Woodworkers, cabinet installers, trim carpenters, remodelers, and serious DIY users who rely on a track saw for clean, controlled cuts. If you mostly do rough layout work, you may not need it. If you care about square panel cuts, repeatable miters, and faster setup on sheet goods, the Kreg 90-Degree & 45-Degree Universal Track Saw Square earns its keep pretty quickly.

Cutting Angles 90 degree and 45 degree Construction Precision-machined all-metal Compatibility Fits most major track saw systems Weight (lbs) 1.73 lbs Blade Orientation Support Right-hand and left-hand blade saws Mounting System Wedge-mount Made In India Warranty 3 Years Limited

Why the Kreg 90-Degree & 45-Degree Universal Track Saw Square (ACS4590) Makes Sense

This is the kind of track saw accessory that saves time every time you use it, because accurate setup is the whole game with panel cutting and miters.

• Who it's for: Woodworkers, cabinet builders, trim guys, and serious DIY users who want faster, more repeatable track saw setup on sheet goods and finished parts.
• Why it stands out: You get 90 degree and 45 degree capability in one all-metal square, plus wide compatibility across major track saw systems.
• Worth knowing: This is an accuracy accessory, not a shortcut for bad technique. If you already cut with a guide rail and care about repeatability, you will appreciate it. If you rarely use a track saw, it may be more tool than you need.

• What does this tool do? It gives you a fixed 90 degree or 45 degree reference for positioning a track saw rail, so you can make repeatable crosscuts and miters faster.
• Will it work with only Kreg rails? No. It fits most major track saw systems, including Kreg, Festool, Makita, Milwaukee, DeWalt, Metabo, and PowerTec.
• Can it be used with left-hand and right-hand blade saws? Yes. It is compatible with both right-hand and left-hand blade saws.
• Is it durable enough for regular shop use? It is built with a precision-machined all-metal body, which is intended to stay accurate over years of use.