Small but Powerful: The Best Compact Milwaukee Drills for Trade Professionals

If you've ever tried to drive a screw in a ceiling joist, run wiring through a wall cavity, or fasten hardware inside a tight mechanical enclosure, you already know the problem. A full-size drill gets in the way. It's too long, too heavy, and too bulky to position correctly, and you end up fighting the tool just as much as the job itself.

Milwaukee has been making compact cordless tools for a long time, but their M12 Subcompact line takes things to a whole new level. These are purpose-built for access, control, and all-day use on the jobsite. 

Whether you're an electrician snaking cable through tight panels, a plumber working under a sink, a finish carpenter on a job site, or a contractor doing punch-out work, these small Milwaukee drills might be just what you need.

Before getting into the individual tools, it's worth talking about why compact size is such a big deal for trade professionals.

When you're drilling overhead, a heavier tool means your arms fatigue faster. That leads to less control, more mistakes, and more time on the job. When you're working inside an electrical panel, a panel box, or any kind of confined space, a long drill body cannot fit at the right angle. You end up working at a bad angle or pulling the drill back and forth trying to find a position that works.

Weight also adds up over a full shift. A tool that is a half pound lighter doesn't sound like much, but after eight hours of drilling and driving, your wrist, elbow, and shoulder will notice the difference. Trade professionals who work in tight or overhead conditions consistently rate compact size and low weight as some of the most important features in a handheld tool.

That's exactly the problem Milwaukee set out to solve with the M12 Subcompact line.

Model: 3401-20 (Bare Tool) | 3401-22 (Kit)

The Milwaukee 3401-20 is Milwaukee's most compact and lightest drill/driver. It measures only 5.4 inches in length and weighs just 2 pounds with a battery installed. To put that in perspective, most standard cordless drills are 7 to 8 inches long and weigh 3 to 4 pounds. The 3401-20 cuts that length nearly in half.

The drill runs on a brushless motor that delivers 350 inch-pounds of torque with a two-speed gearbox. Low range runs from 0 to 450 RPM and high range goes up to 1,550 RPM. That speed range covers most common drilling and driving tasks including wood, metal, and light masonry.

The 3/8-inch keyless chuck is built from forged steel. That matters because cheaper compact drills often use plastic chuck components that crack or wear out quickly in daily use. Milwaukee went with metal here for long-term durability.

There are 12 clutch settings, giving you solid control over torque output when driving screws. You can dial it down for finish work or open it up for structural fastening. The drill also has a full reverse function and variable speed trigger.

Milwaukee's REDLINK Intelligence system is built into the tool and communicates directly with the M12 REDLITHIUM battery pack. The system monitors temperature and load conditions to prevent overheating and overloading. If the tool or battery gets too hot or too stressed, the system backs off performance before any damage occurs. This extends tool life and battery life over time.

REDLITHIUM battery packs are designed with tighter cell construction and better electronics than standard lithium-ion packs. Milwaukee says they deliver more work per charge and more total work over the life of the pack compared to competitor batteries. The 3401-22 kit comes with two CP 2.0 Ah battery packs, a charger, and a contractor bag.

The 3401-20 is a strong pick for electricians doing panel work, HVAC techs installing controls in tight enclosures, carpenters doing trim and cabinet work, and any contractor who frequently works overhead or in confined spaces. It is also a smart second drill to keep on your belt for quick tasks while your main drill charges.

The 5-year tool warranty and 2-year battery warranty on the kit give you solid coverage for day-to-day trade use.

3401-20 Bare Tool:

• (1) M12 Subcompact Brushless 3/8" Drill/Driver Bare Tool (3401-20)

3401-22 Kit:

• (1) M12 Subcompact Brushless 3/8" Drill/Driver (3401-20)

• (2) M12 REDLITHIUM CP2.0 Battery Packs (48-11-2420)

• (1) M12 Lithium-Ion Battery Charger (48-59-2401)

• (1) Contractor Bag (42-55-3450)

Model: 3450-20 (Bare Tool) | 3450-22 (Kit)

If the 3401-20 drill is impressive for its size, the 3450-20 impact driver takes compact tool design even further. This is Milwaukee's smallest and lightest cordless impact driver. It measures 4.3 inches in length and 2.0 inches in width, and it weighs only 1.7 pounds with a battery installed.

That 4.3-inch length is remarkably short for a tool with real power behind it.

The 3450-20 runs a brushless motor delivering up to 1,100 inch-pounds of torque. That is significant output for an impact driver this size. It spins at up to 3,000 RPM and delivers 4,100 impacts per minute. For context, that impact rate is fast enough to drive structural screws, lag bolts, and long deck screws without bogging down.

The 1/4-inch hex drive accepts standard impact-rated bits, so you can use the same bits you already carry. An internal metal gearcase handles the stress of impact driving without the cracking and fatigue that plastic housings can develop over time.

The tool also has an on-board battery fuel gauge so you can check charge level without pulling the battery off the tool.

Impact drivers are already more compact than drills by design, but the 3450-20 takes that advantage further. Think about electrical rough-in work where you're driving screws into studs inside wall cavities, or HVAC installations where you're fastening duct hangers in ceiling spaces with just a few inches of clearance. At 4.3 inches long, this tool can get into positions that a standard impact driver simply cannot.

The 3450-20 also works well for mechanics doing assembly work inside engine bays or equipment compartments where a larger impact cannot swing into position. Contractors doing punch-out work and finish carpenters doing cabinet and fixture installs will find the combination of power and compact size useful on a daily basis.

The bare tool includes a belt clip. Battery and charger are sold separately. If you're already on the M12 platform, your existing batteries work here. If you're new to M12, the 3450-22 kit bundles in two CP 2.0 Ah batteries, a charger, and a contractor bag.

3450-20 Bare Tool:

• (1) M12 Subcompact Brushless 1/4" Hex Impact Driver (3450-20)

• (1) Belt Clip

3450-22 Kit:

• (1) M12 Subcompact Brushless 1/4" Hex Impact Driver (3450-20)

• (2) M12 REDLITHIUM CP2.0 Battery Packs (48-11-2420)

• (1) M12 Battery Charger

• (1) Belt Clip

• (1) Contractor Bag

Model: 3494-22

If you need both a drill/driver and an impact driver and you want to stay on the M12 Subcompact platform, the 3494-22 combo kit is the most straightforward way to do it.

This kit includes the 3401-20 drill/driver and the 3450-20 impact driver together, along with two M12 REDLITHIUM CP 2.0 Ah battery packs, an M12 charger, two belt clips, and a contractor bag. You get the full subcompact setup in one box at a better price than buying each piece separately.

The real value here is that both tools share the same battery platform. You run the same two batteries across both tools, and both tools benefit from REDLINK Intelligence communicating with REDLITHIUM packs. If one battery is on the charger, the other is in a tool. That kind of workflow keeps you moving on the job without waiting.

The drill handles your boring tasks, countersinking, and low-torque driving where clutch control matters. The impact driver takes over for high-torque fastening, driving long screws, and applications where you do not want to cam out or strip a fastener head.

Having both tools on your belt at the same time adds very little total weight. The drill is 2 pounds and the impact is 1.7 pounds. That is under 4 pounds for both tools combined, which is less than a single standard full-size drill. For any tradesperson doing varied work across a shift, that total weight matters.

• (1) M12 Subcompact Brushless 3/8" Drill/Driver (3401-20)

• (1) M12 Subcompact Brushless 1/4" Hex Impact Driver (3450-20)

• (2) M12 REDLITHIUM CP2.0 Battery Packs (48-11-2420)

• (1) M12 Battery Charger (48-59-2401)

• (2) Belt Clips

• (1) Contractor Bag

Model: 3601-20 (Bare Tool)

Not every job calls for an M12. If you need more power and a larger 1/2-inch chuck but still want a compact body, the Milwaukee 3601-20 is worth adding to this conversation.

The 3601-20 is Milwaukee's compact brushless drill/driver on the M18 platform. It measures 5.7 inches in length and weighs 2.3 pounds without a battery. That is slightly longer and heavier than the M12 drill, but it is still noticeably more compact than a standard M18 drill/driver.

The 3601-20 delivers 550 inch-pounds of torque and runs up to 1,700 RPM through a two-speed gearbox. The half-inch metal chuck and all-metal gear case give it the durability to handle heavier drilling tasks that would push the smaller M12 platform. Think larger diameter bits, hole saws in wood or metal, and applications that require more torque to drive large fasteners.

REDLINK Intelligence works the same way here, pairing with M18 REDLITHIUM batteries to monitor and protect the tool and battery during use. The compact design still gives you good overhead control and access into tighter spots compared to a standard full-size M18 drill.

This tool ships as a bare tool, so you need an M18 battery to run it. If you're already invested in the M18 platform, this drops right into your existing setup. The 3601-20 includes a belt clip and carries a 5-year tool warranty.

The choice between these two platforms comes down to the type of work you do most often.

If you work primarily in tight spaces, do a lot of overhead driving, run electrical, work inside panels or enclosures, or want the absolute smallest and lightest tool possible, the M12 platform with the 3401-20 or the combo kit is the better fit.

If you do heavier drilling in wood framing, metal, or concrete, need a 1/2-inch chuck for larger bit shanks, or already run M18 tools and want a compact option that shares batteries with the rest of your kit, the 3601-20 is the right move.

Both platforms are solid choices. It really comes down to which voltage system fits your current setup and what your daily tasks look like.

• (1) M18 Compact Brushless 1/2" Drill/Driver Bare Tool (3601-20)

• (1) Belt Clip

One reason the M12 platform is worth investing in is the size of the system behind it. Milwaukee's M12 lineup includes over 150 compatible tools running on the same batteries. That means the same CP 2.0 batteries that power your subcompact drill and impact driver can also run an M12 rotary hammer, oscillating multi-tool, circular saw, work light, jobsite radio, inflator, and dozens of other tools.

For trade professionals, that kind of battery compatibility across a large tool lineup reduces the number of chargers and battery packs you need to carry and manage on a job site. It also gives you options to expand your M12 tool inventory over time without starting a new battery platform from scratch.

Here is a simple breakdown to help you decide which Milwaukee compact tool or kit makes the most sense:

You should look at the 3401-20 or 3401-22 if: You need a drill/driver for tight spaces, work overhead frequently, are already on M12, or want a lightweight second drill to keep charged and ready.

You should look at the 3450-20 or 3450-22 if: You drive a lot of fasteners and need the compact size of an impact driver, want a tool for panel and enclosure work, or want a lightweight impact that you can use for overhead installation all day.

You should look at the 3494-22 combo kit if: You want both tools at once, want to share batteries between them, and want the convenience of one kit purchase that covers drilling and driving.

You should look at the 3601-20 if: You need a compact M18 drill for heavier work, want a 1/2-inch chuck, and already run M18 batteries on your job site.

Milwaukee built the M12 Subcompact line for professionals who work in real-world conditions. These tools aren't designed for occasional homeowner use or light-duty tasks. They are built for trade professionals who spend full shifts in cramped, overhead, and awkward positions and need tools that can keep up without getting in the way.

The 3401-20 drill, 3450-20 impact driver, and the 3494-22 combo kit represent some of the most capable compact cordless tools available today. They deliver real torque, real speed, and brushless motor efficiency in a package that is smaller and lighter than almost anything else on the market. The 3601-20 rounds out the lineup for those who need M18 power in a compact frame.