Milwaukee Gen 4 vs DeWalt DCF860 The 264° Impact Driver Meltdown!

Milwaukee Gen 4 vs DeWalt DCF860 The 264° Impact Driver Meltdown! is the exact viewer-requested test that turned into a full-on heat and shutdown showdown. I drove 1/4" x 6" lags into a 6×6, drilled brutal 1.5" spade-bit holes, and checked temps with a FLIR. One tool finished at insane heat. The other protected itself… and came up short.

Key takeaways (read this first)

• Milwaukee Gen 4 (2953-20) completed 100 holes and peaked around 264°F at the nose during the final stretch.
• DeWalt DCF860B ran cooler overall, but it shut down sooner under sustained load and finished 21 holes short of the 100-hole goal.
• This isn’t a “normal use” test. It’s a limit test designed to show what happens when the duty cycle gets ugly.

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Why this Milwaukee Gen 4 vs DeWalt DCF860 test exists

In our last matchup, we compared quiet/hydraulic style impacts, and a bunch of you said the same thing: “That’s not the DeWalt we want to see. Put the DCF860 up against the Milwaukee Gen 4.” You weren’t wrong—these are the tools most people actually cross-shop.

If you want the backstory and the “why” behind this rematch, start here (internal link): Milwaukee vs DeWalt Hydraulic Impact Torture Test – One Cooked, One Quit!

Tools in the Milwaukee Gen 4 vs DeWalt DCF860 showdown

Here are the two impact drivers tested in this 264° meltdown comparison:

• DeWalt DCF860B 20V MAX XR (tool-only) — official specs: DeWalt DCF860B product page
• Milwaukee M18 FUEL Gen 4 2953-20 — official specs: Milwaukee 2953-20 product page

Quick spec snapshot (why the matchup is interesting)

On paper, DeWalt comes in swinging with torque. Milwaukee counters with speed, compact size, and control. Here are the headline numbers from the official pages (plus our in-test callouts where noted):

Note: Specs can change over time. I recommend double-checking the official pages linked above if you’re comparing current production versions.

That’s why this comparison is fun: spec sheets don’t tell the whole story once you push sustained load and heat. If you like that theme, you’ll recognize it from this internal link too:

Milwaukee vs DeWalt Hammer Drill Test: Why Buying the Most Powerful Drill Can Be a Mistake!

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Milwaukee Gen 4 vs DeWalt DCF860 test setup (lags + 1.5" spade bits + thermal scans)

This wasn’t a “one fastener and done” demo. I wanted a test that feels like a real job that never gives your tool time to cool off.

The protocol

1. Drive 50 1/4" x 6" lag fasteners into a 6×6 (no pilot holes).
2. Drill 50 holes using a 1.5" spade bit (brand new bits).
3. Check temps with FLIR (front/nose, body, handle areas).
4. Drive 50 more 1/4" x 6" lag fasteners.
5. Return to the 1.5" spade bit and push toward a 100-hole goal.

Important note: This is not the ideal duty cycle for an impact driver. It’s intentionally abusive. The point is to compress time so you see what happens under heat and sustained load—before you find out on a jobsite.

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Milwaukee Gen 4 vs DeWalt DCF860 thermal checks (what the FLIR showed early)

We started taking thermal readings earlier than most people would, because heat is the silent killer in a test like this.

After the first round of lag driving, both tools were already warm. We saw roughly ~148°F at the collet/nose area, while the switch/handle area was far cooler (around “normal hand temperature” range).

That early heat matters because the next step—1.5" spade-bit drilling—doesn’t cool anything down. It compounds the temperature climb.

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Milwaukee Gen 4 vs DeWalt DCF860: 50 lag fasteners (Round 1)

I expected the lag portion to be pretty uneventful, and it mostly was. Both impact drivers can drive lags. However, one detail surprised me:

• DeWalt jumped ahead early in lag driving.
• Milwaukee felt hot sooner in the hand, even while still performing.

I’m not crowning a winner off one round of lags, though. Impacts can look amazing in short bursts. The real story starts when the bit stays buried and the motor has to live under load.

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Milwaukee Gen 4 vs DeWalt DCF860: 1.5" spade bit drilling (Round 1)

Let me say it plainly: 1.5" spade-bit drilling is brutal for an impact driver. It’s not just torque. It’s sustained resistance, heat soak, and the tool’s protection strategy doing whatever it was designed to do.

Both tools became intermittent during drilling. The pattern looked like this:

• Drill most of the way through.
• Stall or shut down.
• Pull out, let the tool free-spin for a second, then finish the hole.

That “pull it out and let it breathe” technique helped a lot. In other words, airflow and recovery time became part of the strategy—not just power.

Also, quick reality check: when you do this kind of drilling, bit quality and bit condition matter. If you want a deep dive on why accessories can change “tool performance” more than people think, this internal test is worth reading:

Harbor Freight Driver Bits Tested – The Results Shocked Me

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Milwaukee Gen 4 vs DeWalt DCF860: The “role reversal” starts

After that first spade-bit round, the heat story got interesting.

DeWalt looked cooler overall—but it also wanted to shut down sooner when it got overheated. Meanwhile, Milwaukee kept running at higher temps and kept pushing the work forward.

This is the trade-off that showed up again and again:

• DeWalt’s approach: shut down earlier to protect the tool (and arguably the user).
• Milwaukee’s approach: run hotter and keep working.

I honestly expected the opposite going into this.

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Milwaukee Gen 4 vs DeWalt DCF860: 50 more lags (Round 2)

Next, we went back to driving another set of 1/4" x 6" lags. This matters because it stacks heat into the same components that are already stressed from the drilling.

At this point, the comparison stopped being “which is stronger” and started being “which strategy matches your work.” Because if you’re a tradesperson running continuous cycles, heat management becomes performance.

If you’ve ever bought “the most powerful tool” and then realized it wasn’t the best choice for how you actually work, you’ll relate to this internal read:

Why buying the most powerful tool can be a mistake (Milwaukee vs DeWalt Hammer Drill Test)

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Milwaukee Gen 4 vs DeWalt DCF860: The 264°F meltdown moment (100 holes)

Now we get to the headline.

We went back into the 1.5" spade-bit drilling for the final stretch. The goal was simple: get to 100 holes.

Milwaukee hit 100 holes. And when it did, the tool was hot enough that you could literally hear it sizzling.

Then we checked temps.

• ~264°F at the nose
• ~245°F at the motor housing

At that point, there was visible heat damage on the tool’s outer coating. That’s the definition of “meltdown moment.”

Now here’s what makes this a real comparison: DeWalt didn’t explode. Older generations of impacts would’ve done something dramatic here. Instead, DeWalt behaved like a modern tool with protection built in.

But… DeWalt finished 21 holes short of the goal. It started bogging down earlier and shutting down sooner as the heat built up. In other words, it “lived to fight another day,” but it didn’t finish the same workload in this compressed test window.

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Milwaukee Gen 4 vs DeWalt DCF860: What the FLIR image tells you in one glance

Thermal imaging is the cheat code for understanding what’s happening. The hottest zones stay concentrated toward the front and main housing under load. That matters because:

• That’s where heat soaks into the anvil/collet area.
• That’s where you’ll accidentally touch, bump, or set the tool down.
• That’s where “it feels fine” can turn into “this is a problem” fast.

So yes, gloves become mandatory. And no, this isn’t a normal duty cycle for an impact driver.

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What this Milwaukee Gen 4 vs DeWalt DCF860 test actually means (real-world buying advice)

Here’s the cleanest way I can explain it:

DeWalt’s DCF860 is acting like a tool that prioritizes protection. It runs cooler overall and shuts down sooner when overheated.

Milwaukee’s Gen 4 is acting like a tool that prioritizes finishing under abuse. It kept going—even when the temperatures got wild.

So which one is “better”?

It depends on your work.

• If you’re doing a lot of heavy fastening and you want a tool that pushes through ugly cycles, Milwaukee’s performance in this meltdown test was impressive.
• If you value a tool that protects itself sooner (and you don’t want a 260°F hairdryer in your hand), DeWalt’s behavior makes sense.

Also, don’t ignore the obvious takeaway: for repeated large-hole drilling, pick a drill. This test is about limits—not best practice.

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Where to buy (with affiliate links)

Disclosure: These links may earn us a small commission at no extra cost to you. It helps fund more independent tests.

• Check price at Home Depot (Milwaukee Gen 4 impact driver)
• Check price at Home Depot (Milwaukee REDLITHIUM FORGE XC 8.0Ah battery)
• Check price at Lowe’s (DeWalt DCF860 impact driver)
• Check price at Lowe’s (DeWalt XR PowerPack 8Ah battery)

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Final verdict: Milwaukee Gen 4 vs DeWalt DCF860 (264°F meltdown edition)

If you only remember one thing from this test, remember this: the tools didn’t just perform differently— they protected differently.

In this compressed torture test, Milwaukee finished 100 holes at a ridiculous temperature peak. DeWalt stayed cooler overall, protected itself sooner, and didn’t finish the 100-hole goal.

Now I want to hear from you: Which protection strategy do you want in your hand? And would an impact driver test like this sway your platform choice one way or the other?

If you want more Milwaukee vs DeWalt punishment tests, here are the two internal reads that pair perfectly with this one:

• Milwaukee vs DeWalt Hydraulic Impact Torture Test – One Cooked, One Quit!
• Milwaukee vs DeWalt Hammer Drill Test: Why Buying the Most Powerful Drill Can Be a Mistake!

Impact Driver Frequently Asked Questions