Milwaukee M18 Fuel 2904-20 Hammer Drill Review

Milwaukee 2904-20 Angle 5

Quick take

The Milwaukee M18 Fuel 2904-20 Hammer Drill is the flagship hammer drill in Milwaukee’s ever-popular Fuel lineup, which rarely disappoints. The 2904-20 is incredibly powerful, drills fast, packs in solid build quality, includes kickback control technology to reduce wrist injuries, and has a highly effective hammer drill mode to power through masonry and thick lumber. However, there are downsides to consider, including the fact that It is bulky and cumbersome. The footprint and weight are expected in this construction-ready category. It’s most suitable for trades workers and prosumers demanding performance but is overkill for most DIY jobs around the home.

Brand Milwaukee
Platform M18 Fuel
Motor Brushless
Speeds 2
Torque in-lbs 1400.0
BPM 33,000.0
Clutch settings 16
Chuck size 1/2"
Same as M18 gen 4 hammer drill

Global rankings

18 models tested

Drilling speed (sec.)10.83
Driving speed (sec.)7.63
Torque (in-lbs)1400.01
Bare weight (lbs)3.2616
Drilling Noise (dBA)95.016

Editorial opinion

Methodology used: Heavy duty

Editorial rating

4.67 / 5 stars


  • Powerful and fast drilling and driving
  • Kickback control technology
  • Long warranty
  • Hammer drill functionality
  • Solid build quality


  • Bulky and heavy

Recommended configuration


Includes (2) M18 Red Lithium XC 5Ah battery

Series lineup

Model #PlatformAction ModesMax Torque (in-lbs)Review
Milwaukee 2607-20M18Drill, hammer500.0Full review
Milwaukee 2801-20M18Drill only500.0Full review
Milwaukee 2903-20 (Gen 4)M18 FuelDrill only1400.0Full review
Milwaukee 2904-20 (Gen 4)M18 FuelDrill, hammer1400.0Full review

Lab results

Drilling speed

Drilling speed total time (drill mode, sec.): 10.8
Drilling speed average time (drill mode, sec.): 2.2
Drilling speed total time (hammer mode, sec.): 8.0
Drilling speed average time (hammer mode, sec.): 1.6
Hammer mode speed improvement: 25.9%

The 2904-20 rapidly bores small and wide holes alike. Importantly for a performance-focused high-end hammer drill, it sustained high RPMs throughout the depth of the holes bored in our drilling speed tests. The 2904-20 was never close to binding up, and it easily cleared chips from the hole.

We also tested the 2904-20 in various drilling applications, including drilling a range of width holes using spade and forstner drill bits. We didn’t encounter a task where the 2904-20 didn’t either match or outperform other flagship hammer drills.

Consider that the 2904-20 may be overkill for most homeowners. Few tasks around the home are likely to push it to the limits, and there are some cheaper and still powerful drills if you aren’t a prosumer and prefer to save some money.

Compare drilling speed test results

Driving speed

GRK total driving time forward (sec.): 7.6
GRK average driving time forward (sec.): 1.5
GRK total driving time reverse (sec.): 6.0
GRK average driving time reverse (sec.): 1.2

The 2904-20 also performed exceptionally well in our driving speed tests, breezing through driving and removing five GRK RSS screws from 2×6 stacked lumber.

We also tested driving various common length and size shorter screws and different gauge lag bolts and decking screws to understand how the 2904-20 performs across a range of tasks. In each test, it finished fasteners rapidly with power.

Compare driving speed test results


Milwaukee 2904-20 RPM Chart

Max RPM speed 2: 2,055.0
Max RPM speed 1: 467.0

The 2904-20 shined in our drilling and driving speed tests due to the high RPM output sustained under load. We tested the RPM output with a contact tachometer, and the 2904-20 is among the fastest in our test fleet.

The 2904-20 also has a moderately high RPM in the low setting, meaning it’ll drill faster than other lesser drills when gearing down for extra torque.

Compare drill RPM test results


Advertised max torque (in-lbs): 1400.0
Advertised max torque (ft-lbs): 116.7

The 2903-20 advertises the highest torque of any drill in our Summer ‘23 test fleet with 1,400.0 in-lbs. This level closely matches the performance of some of the best impact drivers, which are safer and more user-friendly options when driving lags and big fasteners.

Throughout testing, there were several instances where the combined RPM and torque profile led to binding in heavy-duty applications. In those scenarios, Milwaukee’s Autostop kickback control technology shined, helping to avoid wrist injury by instantly stopping the motor.

Note: We don’t currently test drill torque in-house, as we do for impact drivers using a torque meter. The torque commentary discussed here relies upon both advertised torque specifications provided by manufacturers and practical insights learned from performance in our various drilling and driving tests.

Compare drill torque


Milwaukee 2904-20 Chuck Closeup

Chuck size: 1/2″
Chuck sleeve material: Knurled metal

The 2904-20 has an exceptional all-metal chuck that is more premium than most drills, especially the knurled metal sleeve that tightens the chuck with the right amount of friction on your hand for grip.

The three-jaw chuck also holds bits well since the ratcheting mechanism locks tightly onto a bit when tightening. We didn’t run into any scenarios where the chuck inadvertently loosened during use.

Motor & BPM

Milwaukee 2904-20 Drill Modes
Milwaukee 2904-20 Over Rotations Closeup

Motor type: Brushless
Action modes: Drill, hammer
Advertised blows per min. (speed 2): 33,000.0
Advertised blows per min. (speed 1): Not advertised
Variable speed trigger: Yes
Kickback control technology: Yes
Trigger draw length (in.): 0.375

The 2904-20 includes Milwaukee’s Powerstate-branded brushless motor, which offers better efficiency and longevity than brushed motors.

Two drill options are located on the same set ring as the clutch settings. The standard drill mode disengages the clutch, and the hammer drill mode does the same but layers in 33,000.0 blows per minute (BPM) to improve drilling speeds.

The hammering rate is high, explaining why the hammer drill mode effectively increased drilling speeds in our tests.

One standout feature is that the 2904-20 features kickback control technology to reduce the risk of wrist injuries. Near the light in the base, there is a small Autostop light that flashes when the kickback mechanism is triggered when binding up.

We tested the kickback control using several large spade and forstner bits and found that it worked as advertised. But we don’t run standardized tests to understand if Milwaukee’s technology works better than any competing kickback control technology.

Compare drill motors

Clutch & speed settings

Milwaukee 2904-20 Clutch & Speed

Speed settings: 2
Clutch settings: 16

The two-speed gearbox determines the RPM output and can be used in drill and hammer drill mode when the clutch is disengaged or when a clutch setting is selected.

While 16 clutch settings isn’t the highest number available, it’s more than most people will need in practice. Including more clutch settings would only allow you to finely tune the torque to a given driving task. Still, the 2904-20 is precise when the proper clutch setting is engaged.

Compare drill clutch and speed settings

Charging time

Milwaukee 2904-20 Fuel Gauge

Charger tested: Milwaukee M12 & M18 Multi-Volt (48-59-1812)
Charging time 2Ah battery (min.): 41.0
Charging time 4Ah battery (min.): Not tested
Charging time 5Ah battery (min.): 98.0
Charging time per Ah (min.): 20.1
Fuel gauge: On battery

The Milwaukee M12 and M18 multi-volt charger (model 48-59-1812) included in most kits is reasonably fast at charging batteries, including to beat out team red’s most frequent adversary, Dewalt. It takes 41 minutes to charge an M18 2Ah battery and 98 minutes for a 5Ah battery, or approximately 20 minutes per amp-hour.

Milwaukee’s 48-59-1812 charger charges multiple battery voltages in one, conveniently saving space in your shop if you have several M12 and M18 ecosystem tools.

Compare drill charging test results

Design & ergonomics

Stands upright (no battery): Yes
Stands upright (w/ battery): Yes
Grip material: Rubber overgrip
Magnetic holder: No
Bit holder: No
Belt hook: Yes
Lanyard compatible: Yes

The 2904-20 has a forward-leaning handle and a slight upward-pointing head that properly position the drill in the correct plane when exerting forward pressure when drilling.

While an all-metal belt hook in the box is mountable on either side of the base, no onboard bit holder or magnetic plate to store screws is included. Both can be purchased in the after-market from third parties.


Milwaukee 2904-20 On Scale

Bare weight (lbs): 3.26
Weight w/ 2Ah battery (lbs): 4.20
Weight w/ 4Ah battery (lbs): Not tested
Weight w/ 5Ah battery (lbs): 4.87

We look forward to when power tool technology advances to the point where the most powerful drills are compact and light. Unfortunately, that day has yet to come, including with the 2904-20, which is heavy and bulky feeling in hand. This drill is one of the heavier hammer drills in our test fleet and one of the heavier options on the market.

We tested different battery configurations since the working weight can differ meaningfully from the bare tool weight. We recommend combining the 2904-20 with Milwaukee’s M18 Red Lithium CP 2Ah battery for the lightest setup we’d suggest that is still powerful with an acceptable battery life.

Or pair the 2904-20 with Milwaukee’s M18 Red Lithium XC 5Ah battery for a longer run time and improved drilling performance if weight is less of a concern.

Compare drill weight test results


Milwaukee 2904-20 Footprint1
Milwaukee 2904-20 Footprint2

Max height (in.): 9.500
Max width (in.): 3.125
Chuck to back length (in.): 7.000
Base length (in.): 4.625
Base width (in.): 3.125

The 2904-20 is bulky when measured in different orientations. While it is tall with a battery attached, the tip-to-tail length is reasonably short compared to the competition. As a result, it fits better through narrow openings and tight spaces than other high-end hammer drills.

Compare drill footprint test results

Drilling clearance

Min. interior width clearance (in.): 8.625
Min. top edge clearance (in.): 1.375
Min. interior 45-deg. clearance (in.): 6.875

The 2904-20 isn’t the ideal drill for fitting through narrow spaces and into tight corners. While it is admirably compact compared to other hammer drills in its class, it is still bulk overall.

In the three clearance tests we conducted, it performed best with its interior width clearance. It fits moderately well between two vertical boards, primarily thanks to its tip-to-tail footprint.

Compare drilling clearance test results

Auxiliary arm

Milwaukee 2904-20 Auxiliary Arm

Auxiliary arm: Yes

The 2904-20 includes an auxiliary handle to control recoil and enhance stability during heavy-duty drilling tasks, improving user safety. The 2904-20 is a powerful drill, so it makes sense that an auxiliary arm is included.

The handle is easy to attach and remove just behind the chuck and is mountable on either the right or left side.


Milwaukee 2904-20 Noise Chart

Max no-load noise (dBA): 84.7
Max drilling noise (dBA): 95.0

No power tool is a wallflower, but the 2904-20 is one of the loudest drills in our test fleet. We measured 95.0 dBA of noise output in the hammer drilling mode. This result is loud for a hammer drill and rivals the sound profile of an impact driver, which can cause damage with prolonged noise exposure.

Compare drill noise test results


Milwaukee 2904-20 Light Wall
Milwaukee 2904-20 Light Closeup

Light: Yes
Light location: In base
Light positions: 1
Customizable light settings: None
Light count: Single LED
Light active time (sec.): 15.0

The work light located in the base is effective and bright and no-frills at the same time. Several competing high-end Dewalt drills include a three-position light that has a spotlight mode or can be disabled. These premium features enhance the versatility, an area for improvement with the 2904-20.


Tool warranty (years): 2-3 (depends on model)
Battery warranty (years): 5

Milwaukee stands behind the durability of its drills with exceptionally long warranties. The 2904-20 has a five-year warranty, which is among the longest offered by any manufacturer. Milwaukee’s M18 Li-Ion batteries have two or three-year warranties, depending on the specific model.

Picture of Nathan Hamilton
Nathan Hamilton
Nathan Hamilton is the founder of DIY Gear Reviews and a recognized expert in the home and DIY space. He has over 200 bylines covering topics such as power tools, hand tools, and woodworking. Nathan is the strategic director for DIY Gear Reviews, deciding everything from the content covered to designing the testing methodologies for lab-tested reviews. He can be emailed at


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