The Milwaukee M18 FUEL 1/2-inch hammer drill model 2904-20 delivers up to 1,400 in-lbs or 158 Nm of peak torque under load, paired with built-in AutoStop rotational control to protect operators during sudden bind-up events.
Designed for heavy commercial drilling in wood, metal, and masonry, this generation combines high motor output with a shorter tool chassis to improve balance when drilling between tight studs.
How compact is the 2904-20 chassis and how much does it weigh?
The tool measures 6.9 inches or 175 mm in overall length from chuck face to back casing.
This compact physical profile allows tradespeople to drill in constrained framing bays without switching to right-angle attachments. The bare tool weighs 3.3 lbs without an attached battery pack, increasing to 4.9 lbs when fitted with a standard M18 5.0Ah extended capacity battery pack.
What motor and gearbox speeds are available?
Milwaukee equips the drill with a brushless motor and a two-speed all-metal mechanical transmission.
In low gear, the tool operates from 0 to 500 RPM for hole saws, self-feed bits, and large diameter wood augers requiring continuous mechanical leverage. In high gear, the spindle reaches up to 2,100 RPM for fast twist drill penetration in steel. When shifted into hammer mode, the mechanism produces up to 33,000 BPM to drill clean pilot holes in brick, block, and poured concrete.
How does the AutoStop protection system work?
The AutoStop control feature actively monitors tool rotation during drilling.
If a large hole saw or auger catches on a hidden nail or knot, the internal gyroscopic sensors detect rapid counter-rotation and cut motor power within a fraction of a second. A dedicated AutoStop indicator light at the tool base illuminates to confirm the safety intervention, preventing wrist sprains and lost control.
The tool features an all-metal 1/2-inch ratcheting chuck fitted with carbide teeth to grip round and hex shanks securely under heavy vibration.
Who it suits
- Professional tradesperson: Electricians and plumbers running large augers and masonry bits will value the 1,400 in-lbs torque and the protective AutoStop mechanism during daily rough-ins.
- Serious DIYer: An enduring powerhouse capable of handling heavy deck posts, concrete anchor installation, and structural home renovations.
- Fleet or commercial buyer: A dependable core drilling asset compatible across the entire commercial M18 battery ecosystem.
- Existing M18 platform owner: Available as the bare tool 2904-20 or as the 2904-22 two-battery kit, making it easy to upgrade older brushed drills without replacing existing chargers.
Buyers can examine complete kit packages and chuck replacement specifications on Milwaukee Tool authorized distributor websites.
