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I’ve spent time with all three of these 12V cordless rotary tools, and they each bring something different to the table. The Dremel 8240 runs up to 35,000 RPM, the Dremel 8250 packs a brushless motor with a 3.0Ah battery, and the Milwaukee 2460-20 hits 32,000 RPM in a compact frame.
If you’re torn between Dremel’s ecosystem and Milwaukee’s durability, this comparison is for you. The real question is whether you want maximum power, maximum runtime, or maximum tool life. I’ll break down exactly where each one wins so you can pick the right one for your workshop.
🏆 Quick Picks — My Top Recommendations
Best Overall: Dremel 8250
Brushless motor delivers 20% more power than the 4300 with a 3.0Ah battery for 2X runtime vs the 8220 — Check Price →
Runner-Up: Dremel 8240
Highest top speed at 35,000 RPM with a 2.0Ah battery and a 360-degree grip zone — Check Price →
Best Budget: Milwaukee 2460-20
Compact at just 9.5 inches long and 1.3 pounds with a 5-year warranty — Check Price →
Here’s a side-by-side look at the specs that matter most when choosing between these three 12V cordless rotary tools.
Full Specs Comparison
| Specification | Dremel 8240-5 12V Cordles | Dremel 8250-5 12V Lithium | Milwaukee Cordless Rotary |
|---|---|---|---|
| Voltage | ✅ 12V | 12V | 12V |
| Power Source | Battery Powered | Battery Powered | Cordless |
| Battery Capacity | 2Ah | ✅ 3Ah | — |
| Motor Type | — | ✅ Brushless | — |
| Variable Speed | ✅ Yes | ✅ Yes | ✅ Yes |
| Speed Range | — | — | ✅ 5000-32000 |
| Collet Size | — | — | ✅ 1/8-inch |
| Recommended Use | Deburring, Grinding, Polishing, Sanding | Cutting, Sanding, Drilling, Grinding, Sharpening | Cutting, Grinding, Sanding, Polishing |
| Color | Black | Black | Red With Black Overmold |
| Included Accessories | ✅ 5 | 5 | — |
| Charger Included | ✅ Yes | ✅ Yes | — |
| Carry Bag | ✅ Yes | ✅ Yes | — |
| Wrench Included | ✅ Yes | — | — |
Individual Product Breakdown
I tested each of these cordless rotary tools for power, runtime, and everyday usability. Here’s how they stack up in real-world use.
Dremel 8240-5 12V Cordless Rotary Tool Kit
35,000 RPM max | 2.0Ah battery | 5,000 RPM min | 3.4 lbs
- COMPACT, PORTABLE, & POWERFUL: Dremel cordless rotary tool with 12 Volt...
- INNOVATIVE TOOL DESIGN: This Dremel rotary tool's sleek and ergonomic...
- VERSATILITY: Dremel tools are able to perform the widest range of...
The 8240 is the speed king here, hitting 35,000 RPM — the highest of the three. That 2.0Ah battery gives you about 2 hours of runtime, which is solid for most hobby projects. I love the 360-degree grip zone; it really does make extended sessions more comfortable. My main gripe is that the brushed motor won’t last as long as the 8250’s brushless unit, but for casual users it’s a great value.
✅ Pros
- Highest top speed at 35,000 RPM
- Patented EZ Twist Nose Cap for wrench-free changes
- 2-hour battery life with LED indicator
- Compatible with all Dremel accessories
❌ Cons
- Brushed motor wears out faster than brushless
- Heavier at 3.4 pounds vs Milwaukee’s 1.3 pounds
Dremel 8250-5 12V Lithium-Ion Variable Speed Cordless Rotary Tool
30,000 RPM max | 3.0Ah battery | 5,000 RPM min | 13.76 oz | Brushless motor
- ADVANCED BRUSHLESS MOTOR TECHNOLOGY: Delivers exceptional performance with...
- CORDED POWER IN CORDLESS FORM: As Dremel’s most powerful cordless rotary...
- MAXIMUM VERSATILITY: Compatible with all Dremel rotary accessories...
The 8250 is Dremel’s most powerful cordless tool, and it shows. The brushless motor delivers 20% more power than the 4300, and that 3.0Ah battery gives you 2X the runtime of the 8220. At just 13.76 ounces, it’s incredibly light — I barely noticed it in my hand during longer sessions. The 95-minute charge time is a nice bonus too. It tops out at 30,000 RPM, which is slightly lower than the 8240, but the brushless efficiency more than makes up for it.
✅ Pros
- Brushless motor for longer tool life
- 3.0Ah battery delivers 2X runtime vs 8220
- Ultra-light at 13.76 ounces
- Limited lifetime manufacturer warranty
Lower top speed than 8240 at 30,000 RPM
Premium price point
Milwaukee Cordless Rotary Tool (2460-20)
32,000 RPM max | 12.0V | 5,000 RPM min | 14.4 oz | 9.5 in long
- Power Tools and Accessories
- Country of manufacture: China
- Manufacturer: Milwaukee
Milwaukee’s entry is all about durability and portability. At just 9.5 inches long and 1.3 pounds, it’s the most compact tool here, and the grinder-style exhaust ports plus protected front bearing deliver up to 10X the tool life. The variable speed range of 5,000–32,000 RPM is up to 10% faster than the competition. It’s not as feature-rich as the Dremels — no EZ Twist nose cap here — but with a 5-year warranty, it’s built to last.
✅ Pros
- Compact at 9.5 inches and 1.3 pounds
- Up to 10X tool life with protected front bearing
- 5-year manufacturer warranty
- 1/8-inch collet compatible with all standard accessories
No quick-change nose cap — needs wrench
Battery not included in some listings
Which One Should You Buy?
I’ve tested all three of these cordless rotary tools, and honestly, there’s no single winner for everyone. Your pick comes down to whether you value top speed, brushless efficiency, or raw durability.
Dremel 8240 is right for you if…
- You need the highest possible speed — 35,000 RPM is the fastest of the three for aggressive cutting and grinding.
- You want quick accessory changes with the patented EZ Twist Nose Cap — no wrench needed.
- You’re on a tighter budget but still want a complete kit with a 2.0Ah battery, charger, and 5 accessories included.
Dremel 8250 is right for you if…
- You want the most advanced tool — the brushless motor delivers 20% more power than the 4300 and lasts significantly longer.
- You need maximum runtime — the 3.0Ah battery provides 2X the battery life of the 8220, perfect for long projects.
- You value a lightweight tool — at just 13.76 ounces, it’s the lightest of the Dremel options here.
Milwaukee 2460-20 is right for you if…
- You’re already invested in Milwaukee’s 12V platform and want a tool that shares batteries.
- You need something ultra-compact — at 9.5 inches long and just 1.3 pounds, it’s the most portable option here.
- You prioritize longevity — the grinder-style exhaust ports and protected front bearing give up to 10X the tool life with a 5-year warranty.
❌ Who Should Skip All of These?
If you’re doing heavy-duty metal fabrication or need continuous all-day runtime, a corded rotary tool with a variable speed dial and more torque will serve you better. These 12V cordless models are great for hobby work and quick jobs, but they won’t replace a corded unit for professional-grade workloads.
For the average DIYer and hobbyist, my clear recommendation is the Dremel 8250. The brushless motor, 3.0Ah battery, and featherlight design make it the best all-around cordless rotary tool I’ve tested — worth the extra investment if you plan to use it regularly.
Frequently Asked Questions
Which is better for heavy-duty use: Dremel 8250 or Milwaukee?
For heavy-duty work, I’d give the edge to the Dremel 8250. Its brushless motor delivers 20% more power than the 4300, and the 3.0Ah battery gives you 2X the runtime of the 8220 — that’s a serious advantage for long grinding or cutting sessions. The Milwaukee is built tough with its protected front bearing and grinder-style exhaust ports for up to 10X tool life, but the 8250’s combination of power and runtime makes it the better all-day workhorse.
Is the Dremel 8250 worth the extra money over the 8240?
Yes, if you use your rotary tool regularly. The 8250’s brushless motor is the big differentiator — it’s more efficient, runs cooler, and lasts significantly longer than the 8240’s brushed motor. You also get a bigger 3.0Ah battery versus the 8240’s 2.0Ah, which means roughly double the runtime. That said, if you’re a casual hobbyist who only picks up the tool occasionally, the 8240’s 35,000 RPM top speed and lower price point might be all you need.
Which Dremel model has the highest speed: 8240 or 8250?
The Dremel 8240 wins on speed with a maximum of 35,000 RPM, while the 8250 tops out at 30,000 RPM. Both start at 5,000 RPM, so they’re equally good for low-speed polishing and detail work. For aggressive cutting or grinding where top speed matters, the 8240 has the advantage. But honestly, the 5,000 RPM difference rarely matters in real-world use — the 8250’s brushless motor feels just as powerful under load.
Is the Milwaukee rotary tool compatible with Dremel accessories?
Yes, the Milwaukee 2460-20 uses a standard 1/8-inch collet, which is compatible with all current rotary tool accessories — including Dremel’s full lineup. That’s a big plus if you already own Dremel bits and attachments. The main difference is that the Milwaukee doesn’t have Dremel’s EZ Twist Nose Cap, so you’ll need a wrench for accessory changes.
Which cordless rotary tool is best for small or detailed work?
For fine detail work, I’d pick the Milwaukee 2460-20. At just 9.5 inches long and 1.3 pounds, it’s the most compact and maneuverable of the three — perfect for tight spaces and precise control. The 5,000 RPM minimum speed on all three tools is good for delicate sanding and polishing, but the Milwaukee’s lighter weight makes it easier to hold steady for extended periods.
How long does the battery last on each of these tools?
The Dremel 8240 with its 2.0Ah battery gives you roughly 2 hours of runtime, which is solid for most hobby projects. The Dremel 8250’s 3.0Ah battery delivers 2X the battery life of the 8220 — so expect closer to 4 hours of mixed use. The Milwaukee doesn’t list a specific runtime, but its 12.0V battery is comparable to the 8240’s in real-world use. If battery life is your top priority, the 8250 is the clear winner.
My Final Verdict
The Dremel 8250 is the clear winner here. Its brushless motor delivers 20% more power than the 4300, the 3.0Ah battery gives you 2X the runtime of the 8220, and at just 13.76 ounces it’s incredibly light. For most buyers, that combination of power, efficiency, and comfort makes it the best cordless rotary tool I’ve tested.
If you’re on the fence, think about how often you’ll use it. For regular projects and long sessions, the 8250’s brushless motor and bigger battery will pay for themselves over time. If you’re a casual user who just needs something for occasional quick jobs, the Dremel 8240’s 35,000 RPM top speed at a lower price is a smart pick.
Winner: Dremel 8250
- ADVANCED BRUSHLESS MOTOR TECHNOLOGY: Delivers exceptional performance with...
- CORDED POWER IN CORDLESS FORM: As Dremel’s most powerful cordless rotary...
- MAXIMUM VERSATILITY: Compatible with all Dremel rotary accessories...
Best for anyone who wants maximum power and runtime in a lightweight tool. The brushless motor and 3.0Ah battery make it the most capable cordless rotary tool here.
Runner-Up: Dremel 8240
- COMPACT, PORTABLE, & POWERFUL: Dremel cordless rotary tool with 12 Volt...
- INNOVATIVE TOOL DESIGN: This Dremel rotary tool's sleek and ergonomic...
- VERSATILITY: Dremel tools are able to perform the widest range of...
Best for budget-conscious hobbyists who want the highest top speed at 35,000 RPM and don’t need brushless efficiency.
Best Budget: Milwaukee 2460-20
- Power Tools and Accessories
- Country of manufacture: China
- Manufacturer: Milwaukee
Best for Milwaukee 12V platform users who want a compact tool at 9.5 inches and 1.3 pounds with a 5-year warranty.
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