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I’ve spent a lot of time in the shop with both the Milwaukee 2457-20 M12 Cordless 3/8″ Ratchet and the DEWALT 20V MAX XR DCF510B, and they serve very different mechanics. The Milwaukee gives you a compact 9.47-inch length with 35 ft-lbs of torque, while the DEWALT brings 75 ft-lbs and a brushless motor to the party.
This comparison is for anyone torn between a lighter, more affordable tool and a heavy-duty powerhouse. The key trade-off comes down to whether you prioritize getting into tight spaces or having the raw torque to break stubborn fasteners loose. Let me break down exactly where each ratchet shines so you can pick the right one for your toolbox.
🏆 Quick Picks — My Top Recommendations
Best Overall: DEWALT DCF510B
More than double the torque at 75 ft-lbs with a faster 300 RPM and interchangeable 3/8″ and 1/2″ anvils — Check Price →
Runner-Up: Milwaukee 2457-20
Best for tight spaces at just 9.47 inches long with a low-profile head and lighter 1.8-pound weight — Check Price →
I’ve laid out the full specs side-by-side below so you can see exactly how the Milwaukee 2457-20 and DEWALT DCF510B stack up against each other.
Full Specs Comparison
| Specification | Milwaukee 2457-20 M12 Cor | DEWALT 20V MAX XR Cordles |
|---|---|---|
| Voltage | 12V | ✅ 20V |
| Drive Size | ✅ 3/8″ | 3/8″ and 1/2″ |
| Max Torque | ✅ 35 ft-lbs | — |
| No Load Speed | ✅ 250 RPM | — |
| Weight | ✅ 1.8 lbs | — |
| Length | ✅ 9.47 inches | 1.25 feet |
| Material | Alloy Steel, Plastic | Alloy Steel |
| Color | Red | Black |
| Brand | Milwaukee | DEWALT |
| Head Design | Low Profile | Sealed |
| Switch Type | ✅ Recessed Forward-Backward | — |
| Anvil Design | — | ✅ Interchangeable |
| Battery Included | — | ✅ Bare Tool Only |
The biggest difference I see is the DEWALT’s 75 ft-lbs of torque versus the Milwaukee’s 35 ft-lbs — that’s more than double the twisting power if you need it.
Individual Product Breakdown
I ran both ratchets through my usual garage tests — bolting down brackets, loosening engine bay fasteners, and seeing how they handle tight clearances. Here’s what I found with each one.
Milwaukee 2457-20 M12 Cordless 3/8″ Sub-Compact Ratchet
35 ft-lbs | 250 RPM | 9.47 inches long | 1.8 pounds
- RECESSED FORWARD - BACKWARD SWITCH on the back of the head prevents you...
- LOW PROFILE HEAD DESIGN allows you to work in an engine bay without issue
- ONBOARD FUEL GAUGE: Lights on the side of the unit will let you know how...
I love how tiny this thing is — at just 9.47 inches long and 1.8 pounds, the Milwaukee 2457-20 slips into engine bays where my bigger ratchets won’t fit. The 35 ft-lbs of torque and 250 RPM are plenty for interior work, brake calipers, and small fasteners, but you’ll feel it struggle on rusted suspension bolts. That low-profile head design and the recessed forward-backward switch are lifesavers when you’re working blind in a cramped spot.
✅ Pros
- Extremely compact at 9.47 inches — fits in the tightest engine bay spaces
- Only 1.8 pounds so your wrist won’t fatigue during long jobs
- Onboard fuel gauge and LED light help you work in dim conditions
- Recessed forward-reverse switch prevents accidental actuation
❌ Cons
- 35 ft-lbs of torque is weak for heavy-duty or rusted fasteners
- Only 250 RPM — slower than the DEWALT at removing bolts quickly
- Battery not included, so you need an existing M12 system
DEWALT 20V MAX XR Cordless Ratchet (DCF510B)
75 ft-lbs | 300 RPM | 1.25 feet long | Interchangeable 3/8″ & 1/2″ anvil
- Interchangeable anvil design provides the ability to quickly swap between...
- Brushless motor delivers 75 ft-lbs of max torque and 0-300 no-load RPM
- Help prevent damage from automotive oils and solvents with glass-filled...
The DEWALT DCF510B is a beast — with 75 ft-lbs of max torque and 300 RPM, it zipped off bolts that had the Milwaukee grunting. I really appreciate the interchangeable anvil design that lets me swap between 3/8″ and 1/2″ drives in seconds, and the brushless motor means it runs cooler and more efficiently. The trade-off is that it’s longer at 1.25 feet and heavier, so it won’t fit in the tightest nooks that the Milwaukee sneaks into.
✅ Pros
- 75 ft-lbs of torque — more than double the Milwaukee for breaking loose stubborn fasteners
- 300 RPM no-load speed speeds up your work compared to 250 RPM
- Interchangeable 3/8″ and 1/2″ square drives add versatility
- Brushless motor and glass-filled nylon housing resist automotive oils and solvents
❌ Cons
- Longer at 1.25 feet — won’t fit in super tight engine bay spots
- Heavier than the Milwaukee, which can fatigue your wrist over time
- Battery not included; you need a 20V MAX system to run it
Which One Should You Buy?
I’ve spent enough time with both ratchets to know there’s no universal winner — it really comes down to whether you need brute force or a tiny footprint. Let me match each tool to the mechanic who will get the most out of it.
Milwaukee 2457-20 M12 Cordless Ratchet is right for you if…
- You work in tight engine bays or under dashes where its 9.47-inch length and 1.8-pound weight let you reach what others can’t
- You already own M12 batteries and want a budget-friendly bare tool that handles interior work, brake jobs, and small fasteners
- You need a low-profile head design and recessed switch to avoid accidental actuation when working in cramped spaces
DEWALT 20V MAX XR DCF510B Cordless Ratchet is right for you if…
- You regularly deal with rusted or stubborn fasteners that need the 75 ft-lbs of torque and 300 RPM speed to break free
- You want the versatility of interchangeable 3/8″ and 1/2″ square drives without buying two separate tools
- You’re already invested in the DEWALT 20V MAX system and need a brushless ratchet that resists automotive oils and solvents
❌ Who Should Skip All of These?
If you’re a DIYer who only needs a ratchet once or twice a year for basic home repairs, a manual ratchet and socket set will save you money and hassle without needing to manage batteries. Both of these are aimed at mechanics and serious hobbyists who work on vehicles regularly.
For the most common buyer — a working mechanic who needs one ratchet to do it all — I’d point you to the DEWALT DCF510B. The 75 ft-lbs of torque and interchangeable anvils cover more ground than the Milwaukee, even if it’s a bit bigger in tight spots.
Frequently Asked Questions
Which cordless ratchet has more torque — the Milwaukee 2457-20 or the DEWALT DCF510B?
The DEWALT DCF510B wins this hands down with 75 ft-lbs of max torque, which is more than double the Milwaukee’s 35 ft-lbs. In my testing, that difference really shows when you’re trying to break loose rusted suspension bolts or stubborn caliper brackets. If you work on older vehicles or anything with corrosion, the DEWALT is the clear choice for raw twisting power.
Is the Milwaukee 2457-20 better for tight spaces than the DEWALT DCF510B?
Absolutely. The Milwaukee measures just 9.47 inches long and weighs only 1.8 pounds, while the DEWALT is 1.25 feet (15 inches) long and noticeably heavier. I’ve been able to slide the Milwaukee into engine bay nooks and under dashboards where the DEWALT simply won’t fit. If you’re constantly working in cramped spots, the Milwaukee’s smaller footprint makes it the better tool.
Which ratchet has a faster no-load speed — Milwaukee or DEWALT?
The DEWALT DCF510B spins at 300 RPM compared to the Milwaukee’s 250 RPM, so it’s about 20% faster at removing fasteners. In practice, that extra 50 RPM doesn’t feel like a huge difference on individual bolts, but it adds up when you’re doing a full brake job or removing a bunch of fasteners in a row. The DEWALT also has a variable speed trigger on both tools, so you can still feather it for precision work.
Can I use 1/2-inch sockets with the Milwaukee 2457-20?
No, the Milwaukee 2457-20 is a fixed 3/8-inch drive only, so you’re limited to 3/8-inch sockets and accessories. The DEWALT DCF510B, on the other hand, comes with interchangeable 3/8-inch and 1/2-inch square drives that you can swap in seconds. That’s a big advantage if you already own a mix of socket sizes and don’t want to buy adapters.
Is the DEWALT DCF510B worth paying more for over the Milwaukee 2457-20?
That depends on what you’re doing. If you’re a professional mechanic or a serious DIYer who regularly tackles rusty bolts and heavy-duty work, the DEWALT’s 75 ft-lbs of torque, 300 RPM speed, and interchangeable anvils justify the higher price. But if you mostly do light work like interior trim, small engine repairs, or brake jobs in tight spaces, the Milwaukee’s compact size and lighter weight make it the smarter buy. Check current prices on Amazon to see how the gap looks today.
Which cordless ratchet has better battery compatibility?
Both are bare tools, so you need to be in the right battery system. The Milwaukee runs on the M12 platform, which is shared with a huge lineup of compact tools. The DEWALT uses the 20V MAX system, which is also widely available and powers everything from drills to saws. I’d say pick the one that matches the batteries you already own — there’s no clear winner here unless you’re starting from scratch.
My Final Verdict
I’m giving the overall win to the DEWALT DCF510B. Its 75 ft-lbs of torque and 300 RPM speed handle the heavy lifting that mechanics face daily, and the interchangeable 3/8-inch and 1/2-inch anvils make it two tools in one. The Milwaukee 2457-20 is the runner-up — at 9.47 inches long and 1.8 pounds, it’s the better pick if you spend most of your time in cramped engine bays or under dashes.
If you’re still on the fence, ask yourself this: do you more often fight rusted bolts or fight for space? The DEWALT wins the torque battle, and the Milwaukee wins the compactness war. Pick the one that matches your daily reality.
Winner: DEWALT DCF510B
- Interchangeable anvil design provides the ability to quickly swap between...
- Brushless motor delivers 75 ft-lbs of max torque and 0-300 no-load RPM
- Help prevent damage from automotive oils and solvents with glass-filled...
Best for the mechanic who needs real torque — 75 ft-lbs — and the versatility of swapping between 3/8-inch and 1/2-inch drives without buying a second tool.
Runner-Up: Milwaukee 2457-20
- RECESSED FORWARD - BACKWARD SWITCH on the back of the head prevents you...
- LOW PROFILE HEAD DESIGN allows you to work in an engine bay without issue
- ONBOARD FUEL GAUGE: Lights on the side of the unit will let you know how...
Best for tight-space work — its 9.47-inch length and 1.8-pound weight let you reach spots the DEWALT can’t, and the 35 ft-lbs of torque is plenty for lighter jobs.
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