Makita GSH06 16-5/8" Cordless Circular Saw Review: A Battery-Powered Beast

Introduction

The Makita GSH06 is billed as the world’s largest cordless circular saw, and the claim is easy to believe once you see the blade. At 16-5/16 inches (marketed as 16-5/8”), this saw is built around Makita’s XGT platform, the company’s high-output 40V max battery system, and it runs on a single battery.

That alone makes it unusual. A saw of this size traditionally means a cord, a stand, and often two people to manage the workpiece. The GSH06 aims to replace that setup for framing and structural carpentry work, and this review walks through where it delivers and where you should think twice.

First Impressions: Size, Weight, and Balance

With battery installed, the GSH06 weighs 24.3 lb. That sounds heavy on paper, and it is a heavy saw, but the first surprise is how well the weight is distributed. It feels far less front-heavy than the dimensions suggest, and it does not have a tendency to fall forward when gripped at the handle.

The saw is genuinely enormous. Held up next to a person, the blade guard alone looks oversized. Yet the handling impression from actual use is that it cuts smooth and controlled, with none of the struggle you might expect from a tool of this scale.

Cutting Capacity and Blade Performance

The headline number is the 6-1/4 inch cutting capacity at 90°. That means the saw can cut clean through 6x material in a single pass: roof rafters, laminated beams, and I-joists included. No flipping the board, no second pass from the underside. For anyone who regularly cuts structural lumber, that is a genuine time saver.

Bevel cuts hold up well too. At 45°, the saw still reaches roughly 4-3/4 inches of depth of cut, getting almost fully through a 6x6 in one motion.

The GSH06 ships with a new max efficiency blade engineered for less drag. Makita claims up to 60% faster cutting and 50% more cuts per charge compared to standard blades. In use, the cuts came out smooth with no discernible struggle, and plunge cuts in particular produced a finished, clean surface.

Adjustability and Onboard Features

Depth of cut adjustment is smooth throughout its range, from a minimum of 13/16 inch up to the full 6-1/4 inch capacity. The lever is described as buttery smooth, and once loosened the adjustment glides without sticking. Bevel adjustment uses a single bolt and the scale carries useful measurement markings.

There are several practical touches worth noting:

• Guide rail slot: the shoe accepts a guide for straight, repeatable cuts.
• Onboard tool storage: blade changing tools ride on the saw itself.
• Blade stop: a strong electric brake stops the 16-5/16” blade quickly, which matters given how much momentum a blade that size carries.
• AWS capability: with a Bluetooth sending unit installed, the saw wirelessly triggers a compatible dust extractor to switch on and off automatically.

The safety trigger is positioned at the front of the handle, adding a deliberate step before the saw starts, which makes sense for a tool this powerful.

Battery Life and Buying Advice

On runtime, a single charge delivered around eight cuts in testing, including multiple bevel cuts and a plunge cut through thick material. The comparison worth making is with five years ago: cutting through a 6x6 cordless would have meant constant battery swaps, and a saw of this size simply would not have existed on a battery platform.

If you regularly cut 6x material, rafters, or beams, the single-pass capability and wireless dust extraction integration make a compelling case. If your work is mostly dimension lumber and sheet goods, a smaller saw remains the more practical choice, and the GSH06’s weight and size would be overkill.

Conclusion

The Makita GSH06 is a genuinely impressive piece of engineering: a 24.3 lb, 40V max cordless circular saw that cuts 6x material in one pass, brakes a 16-inch blade quickly, and does it all with smooth, well-balanced handling. For structural carpenters and framers who want corded-class capacity without the cord, it is one of the most capable options available. For everyone else, it is worth admiring from a distance.