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The DEWALT DCD799B 20V MAX Atomic Compact Series brushless hammer drill delivers 552 UWO in a 6.49-inch head, making it a go-to for drilling in tight spaces and light screwdriving.
Categories : tools
SKU : WOR-TOO-428
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The DEWALT DCD799B 20V MAX Atomic Compact Series 1/2 in. Brushless Cordless Hammer Drill is a tool-only powerhouse built for tight access and tough drilling tasks. With 552 UWO, up to 1,650 RPM, and 28,050 BPM, this compact hammer drill handles wood, metal, and masonry while slipping into spots a full-size drill simply won't fit. It's an ideal second drill for electricians, plumbers, HVAC techs, and any homeowner working between studs, in attics, or on overhead fastening.
At just 6.49 inches long (tool head only), the DCD799B is DEWALT's shortest 20V MAX hammer drill. That compact footprint is the defining attribute here: it opens up cramped work areas without giving up the torque and speed you need for mixed drilling. The brushless motor also helps get more work per charge when used with a compatible 20V MAX battery.
Yes, with the right expectations. The DCD799B is a hammer drill, not a dedicated impact driver, and it does not have a multi-position clutch ring. To drive screws, switch to drill mode (not hammer), set the gearbox to low speed, and ease off the trigger as the screw seats. For frequent or production screwdriving, you'll be better served by a drill/driver or impact driver, but for the occasional screw in a tight spot, this tool can handle it.
If you've fought a full-size drill between rafters or above a drop ceiling, the value of a short head is immediately obvious. The DCD799B's 6.49-inch head length reduces the reach you need and gives you better control when working off a ladder or in a corner. Full-size hammer drills tend to measure 8 inches or more and weigh over 3.5 pounds; this Atomic model cuts both down.
This is a tool-only purchase: DEWALT 20V MAX battery and charger are sold separately. That's the right choice if you already own 20V MAX batteries and want a compact hammer drill without paying for another charger.
6.49 in. head length reaches tight spaces full-size drills can't
552 UWO brushless power for masonry, wood, and metal
1/2 in. ratcheting chuck holds bits firmly
28,050 BPM hammer action for concrete and block
LED light brightens dark work areas
Model: DCD799B
Series: 20V MAX Atomic Compact Series
Voltage: 20 V MAX
Max Power: 552 UWO
Max Speed: 1,650 RPM
Chuck Size: 1/2 in. ratcheting
Motor Type: Brushless
Tool Length: 6.49 in.
Tool Weight: 2.53 lb.
Product Type: Cordless Hammer Drill
Max Impact Rate: 28,050 BPM
Battery Platform: DEWALT 20V MAX
Seller: Workbench World
MPN: DCD799B
The DCD799B's compact 6.49-inch head is the real story. If you've ever tried to drill a pilot hole between two studs, above a cabinet, or from an awkward ladder position, you know why length matters. This hammer drill lets you work closer to the surface, with less leverage fighting against you.
Because it's sold as a bare tool, you can choose the battery that matches your job. A compact 2Ah pack keeps weight down; a 5Ah or higher pack delivers longer runtime for bigger drilling runs. Since you're already in the DEWALT 20V MAX system, you don't need a new charger or ecosystem.
For concrete or masonry, let the tool do the work. Apply moderate pressure, let the hammer action break through the surface, and use a masonry bit rated for rotary hammer drilling. For tile, go lighter and avoid hammer mode at the edges. And for wood or metal, keep hammer mode off to get cleaner holes.
When you need to drive a screw in a tight spot, use a driver bit with a magnetic holder, set the gearbox to low, and keep your wrist square to the screw. The lack of a clutch means you'll want to run the screw slowly and stop before it strips. It's a good occasional screwdriving tool, not a replacement for an impact driver on long fastener runs.
Yes, for light and medium screwdriving. Switch to drill mode, use low speed, and keep steady pressure. It doesn't have an adjustable clutch ring, so be careful not to overdrive screws.
No, the DCD799B is a compact hammer drill with a two-speed gearbox rather than a multi-position clutch. It's designed mainly for drilling; for frequent screwdriving, a drill/driver or impact driver is a better fit.
It uses DEWALT 20V MAX batteries. The battery and charger are sold separately, so this tool is best if you already have 20V MAX gear.
In drill mode, the chuck rotates normally for wood, metal, and plastic. In hammer mode, the tool adds a hammering action to help crush masonry. Always use drill mode for screws.
The tool head is 6.49 inches long, making it DEWALT's shortest 20V MAX hammer drill and a solid choice for tight spaces.
Tiny but mighty.
Fits where my regular drill won't. Great for overhead work.
My old drill finally gave out, so I picked this compact model. It's noticeably lighter and easier to manage on a ladder. The hammer function works well on brick. The battery life is good. The only reason for four stars is the chuck sometimes loosens under heavy load. Overall, I'm pleased.
Good drill for tight spaces. The brushless motor has plenty of power.
Go-to drill every day.
I'm not strong, but this drill is so light I can use it one-handed. It drove screws into studs with no trouble. The variable speed trigger lets me go slow for delicate work. The compact head gets into places my old drill couldn't. I painted and hung all the new shutters myself. It's my favorite tool now.
Power to weight ratio is excellent. Only issue is the LED is positioned oddly.
I make custom cabinets, so space is tight. This drill is the first one that lets me work comfortably in frameless boxes. The clutch has nice fine adjustments. It's quiet too. I've used it for a month without a complaint.
Great for dorm room projects. It's compact enough for my toolbox.
Light and reliable.
