DEWALT DCS391NT-XJ Review

Few tools define a construction site or workshop floor quite like a circular saw. It is the tool that turns a stack of timber into a framed wall, a sheet of plywood into fitted cabinetry, and a decking board into a precisely trimmed deck edge. A good circular saw feels like an extension of your arm — balanced, powerful, and predictable. The blade spins up instantly, bites cleanly into the material, and tracks straight with minimal effort from the user. Cordless models have reached a point where they genuinely rival their mains-powered counterparts in power and runtime, while offering the freedom to cut anywhere — up scaffolding, at the far end of a garden, or in a roof space where cables would be a hazard. The best cordless saws combine a brushless motor for efficiency, a rigid magnesium or aluminium base plate for accuracy, and tool-free adjustments that let you switch from a 90-degree rip cut to a 45-degree bevel in seconds. For carpenters, kitchen fitters, deck builders, and serious DIYers, the cordless circular saw has become the backbone of the toolkit.

DeWalt's XR (Extreme Runtime) cordless platform is one of the largest and most trusted 18V tool ecosystems in professional construction. The DCS391 circular saw sits in the XR lineup as a versatile 165 mm (6½-inch) saw designed for general-purpose cutting — ripping timber, cross-cutting boards, and trimming sheet materials. When evaluating a cordless circular saw, the critical specifications are blade diameter (165 mm is the standard for all-round use), maximum cutting depth at 90 degrees (55 mm in this case, enough to cut through a 50 mm timber in a single pass), bevel capacity (50 degrees covers the vast majority of angled cuts), and base plate material (magnesium offers the best strength-to-weight ratio). Beyond raw numbers, features like an electric brake, spindle lock for quick blade changes, and a comfortable grip with good visibility of the cut line make the difference between a saw you tolerate and one you genuinely enjoy using.

This review examines the DeWalt DCS391NT-XJ, a bare-unit 18V XR circular saw supplied in a TSTAK carry case without batteries or charger — ideal for users already invested in the DeWalt XR battery platform. We evaluate cutting power, accuracy, ergonomics, build quality, and how it performs across a range of materials from softwood framing to sheet plywood. By the end, you will know whether this saw deserves a spot in your tool collection.

At the core of the DCS391 is a high-performance 18-volt motor spinning a 165 mm carbide-tipped blade at up to 5 150 RPM under no load — delivering the blade speed needed for clean, burn-free cuts in softwood, hardwood, and sheet materials. The 24-tooth blade supplied is a general-purpose ripping blade, aggressive enough for fast framing cuts yet fine enough to leave an acceptable finish on cross-cuts. Maximum cutting depth at 90 degrees is 55 mm, which means a standard 50 mm (2-inch) timber can be cut in a single pass. At a 45-degree bevel, the depth capacity reduces to approximately 42 mm — still enough for most angled trim and rafter work. The saw is a bare unit (body only), designed for users who already own DeWalt 18V XR batteries and a charger; it is compatible with all XR batteries from compact 1.5 Ah packs through to high-capacity 5.0 Ah and FlexVolt units.

Build quality reflects DeWalt's professional positioning. The base plate is pressed magnesium — significantly lighter than pressed steel yet stiffer and more durable than aluminium. Magnesium resists corrosion, does not warp under heat, and provides a smooth, low-friction surface that glides across timber without scratching. The blade guard is robust and operates smoothly, retracting cleanly as the saw enters the cut and snapping back into place as it exits. Tool-free depth and bevel adjustments are operated by large, clearly marked levers that are easy to use even with gloved hands. The bevel scale is engraved into the bracket and readable at a glance, with positive stops at common angles including 22.5 and 45 degrees.

Ergonomics and handling have been carefully considered for all-day professional use. The main handle is rubber-overmoulded and contoured to fit the palm, with a texture that stays grippy in dusty or damp conditions. A secondary front handle provides a two-handed grip option for controlled, straight tracking — especially valuable when cutting without a guide rail. The trigger is positioned for natural index-finger operation and features an electric brake that stops the blade within approximately two seconds of release — a genuine safety feature that also speeds up workflow between cuts. The spindle lock button is conveniently located, enabling single-wrench blade changes in under a minute. At 2.9 kg without battery (approximately 3.5 kg with a 5.0 Ah pack), the saw is neither the lightest nor the heaviest in its class, striking a good balance between portability and the mass needed for stable, controlled cuts.

The saw includes an airlock-compatible dust extraction port that connects to a 35 mm vacuum hose — essential for cutting MDF, cement board, or any material that generates harmful dust. Also included in the box is a parallel rip guide (edge fence) that attaches to the base plate for repeatable straight cuts along the edge of a board. The TSTAK carry case is a genuine asset: it is a robust, stackable, modular case that locks together with other TSTAK units for organised transport and storage. It accommodates the saw, the rip fence, a spare blade, and the hex key. For users with DeWalt's Tool Connect system, the saw is compatible with the optional Bluetooth tracking module that lets you locate a misplaced tool from a smartphone.

The complete kit in its TSTAK case measures 44 × 33 × 29.5 cm and weighs approximately 5 kg including the case — compact and manageable for transport between jobs. The saw itself is manufactured in the Czech Republic and backed by a 2-year manufacturer warranty, with spare parts availability guaranteed for at least 2 years in the EU. Customer reception has been very strong: the DCS391 holds a 4.6 out of 5 stars rating from 516 reviews on Amazon and ranks in the top 30 circular saws on the platform. Users consistently praise its cutting power, the quality of the magnesium base plate, and the convenience of the TSTAK storage system. As part of the XR ecosystem, it shares batteries with over 250 DeWalt tools, making it a natural addition for anyone already using the platform.

The DeWalt DCS391 is built for professional carpenters, kitchen fitters, and serious renovators who already own DeWalt 18V XR batteries and need a versatile, cordless circular saw for cutting timber and sheet materials on site.