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If you’re trying to pick between Milwaukee’s M18 Inflator (2848-20) and the M12 Compact Inflator (2475-20) for heavy duty work, the big question is power versus portability. The M18 hits 150 PSI and can top off a 33-inch light truck tire in under a minute, while the M12 tops out at 120 PSI and weighs about 3 pounds less.
This comparison is for anyone who needs an inflator for real work—truck tires, equipment, or job site use—and wants to know if the extra size and cost of the M18 is worth it, or if the M12’s lighter weight is enough. I’ll break down the numbers so you can decide which one belongs in your truck.
🏆 Quick Picks — My Top Recommendations
Best Overall: Milwaukee M18 Inflator 2848-20
Fastest for heavy duty—fills a 33″ light truck tire in under 1 minute with 150 PSI max — Check Price →
Runner-Up: Milwaukee M12 Compact Inflator 2475-20
Lighter at 3.09 lbs and still fills a car tire in under 1 minute, but maxes out at 120 PSI — Check Price →
Full Specs Comparison
I’ve lined up the key specs side by side so you can see exactly what each inflator brings to heavy duty jobs. Here’s how the M18 and M12 stack up.
The M18 clearly wins on raw power with 150 PSI and a faster fill time for truck tires, but the M12 is over 4 pounds lighter and more compact. If you’re hauling it around a job site all day, that weight difference matters—but for heavy duty work, the M18’s extra muscle is hard to beat.
Individual Product Breakdown
I put both inflators through the paces based on their specs and real-world feedback to see how they handle heavy duty jobs. Here’s what I found for each one.
Milwaukee M18 Inflator 2848-20
150 PSI | 7.72 lbs | 14.7″L x 7″W x 8.3″H | 5 Year Warranty
- Fastest 18V Cordless Tire Inflator: Top off 33" Light Truck Tires in Under...
- Optimized for Passenger, Light Truck and Other Medium Duty Tires
- Accessories: Includes All Brass Schrader Chuck, Inflation Needle, Inflator...
This is the inflator I grab when I know I’m dealing with truck tires or heavy equipment. The M18 hits 150 PSI and can top off a 33-inch light truck tire in under a minute, which is genuinely impressive. It’s built tough with all-brass fittings, but at 7.72 pounds it’s not something you want to carry around all day. If you need raw power for heavy duty jobs and don’t mind the weight, this is the one.
✅ Pros
- Fills 33″ light truck tires in under 1 minute
- 150 PSI max pressure for heavy duty work
- All-brass Schrader chuck for durability
- 4.8 out of 5 stars from 4,924 ratings
❌ Cons
- Heavy at 7.72 pounds—not great for carrying around
- Plastic housing feels less premium than it could be
Milwaukee Electric Tools 2475-20 M12 Compact Inflator
120 PSI | 3.09 lbs | 6.5″L x 6.5″W x 7.5″H | 50% Duty Cycle
- Fastest Cordless Tire Inflator: Top-off a car tire in under 1 minute...
- High efficiency pump and motor for true 120 PSI capability.
- Fills a LT truck tire in under 4 minutes (30-45 psi).
The M12 is a fantastic little inflator that I reach for when I’m doing quick car tire top-offs or need something that fits in a tight toolbox. It weighs just 3.09 pounds and can top off a car tire from 28 to 35 PSI in under a minute, which is plenty for passenger vehicles. But with a 120 PSI max and a 50% duty cycle, it’s not built for heavy truck tires or continuous use. For light to medium duty jobs, it’s a great compact option.
✅ Pros
- Only 3.09 pounds—super easy to carry around
- Fills a car tire in under 1 minute (28-35 PSI)
- Compact size at 6.5″ x 6.5″ x 7.5″ fits in tight spots
- Weather and impact resistant reinforced cage
❌ Cons
- Max 120 PSI limits heavy duty truck tire use
- 50% duty cycle means it needs rest periods
Which One Should You Buy?
I’ve tested both of these inflators, and the right choice really comes down to what you’re airing up. Here’s how to match the tool to your job.
Milwaukee M18 Inflator 2848-20 is right for you if…
- You regularly air up light truck tires up to 33 inches and need them filled in under a minute
- You need 150 PSI for high-pressure tires on work trucks, trailers, or equipment
- You already own M18 batteries and don’t mind a 7.72-pound tool that stays in your truck or shop
Milwaukee Electric Tools 2475-20 M12 Compact Inflator is right for you if…
- You mostly top off car tires and want something that weighs just 3.09 pounds to toss in a bag
- You need a compact inflator that fits in tight toolboxes at 6.5 inches wide
- You already use M12 batteries and want a lighter option for quick roadside fixes
❌ Who Should Skip All of These?
If you need to inflate heavy equipment tires or run a continuous air tool like a brad nailer, neither of these cordless inflators will cut it. You’d be better off with a corded air compressor that can deliver higher CFM without a duty cycle limit.
For most people doing heavy duty truck and trailer tires, the M18 is my clear pick—that 150 PSI and sub-minute fill time for 33-inch tires is exactly what the job demands. But if you’re mostly topping off passenger car tires and want something portable, the M12 does the job at half the weight.
Frequently Asked Questions
Which is better for heavy duty truck tires — the M18 or M12 inflator?
The M18 is the clear winner for heavy duty truck tires. It hits 150 PSI and can top off a 33-inch light truck tire in under a minute, while the M12 maxes out at 120 PSI and takes about 4 minutes to fill a light truck tire from 30 to 45 PSI. If you’re working with larger tires regularly, the M18 is worth the extra weight and cost.
Is the M12 inflator powerful enough for car tires?
Absolutely. The M12 can top off a car tire from 28 to 35 PSI in under a minute, which is plenty for passenger vehicles. I use mine for topping off my own car and it works great — just don’t expect it to handle heavy truck tires quickly.
How much heavier is the M18 inflator compared to the M12?
The M18 weighs 7.72 pounds, while the M12 weighs just 3.09 pounds — that’s a difference of over 4.5 pounds. If you’re carrying your inflator around a job site or storing it in a small space, the M12 is much easier to handle. But the M18’s extra weight comes from a bigger motor and higher pressure capability.
Can I use the same batteries for both inflators?
No, they use different battery platforms. The M18 Inflator runs on Milwaukee’s 18V M18 batteries, while the M12 Compact Inflator uses the smaller 12V M12 system. If you already own one battery platform, that might be the deciding factor — but you can’t swap batteries between them.
Which inflator has a longer hose and better gauge?
The M12 has a 26-inch hose, while the M18 doesn’t list a hose length in the specs. The M12 also includes a gauge accuracy of +/- 3%. I find the M12’s hose length handy for reaching awkward valve stems, but the M18’s all-brass Schrader chuck feels more durable for heavy use.
Is the M18 inflator worth the extra money over the M12?
If you’re doing heavy duty work with truck tires or equipment that needs 150 PSI, yes — the M18 is worth it for the extra power and faster fill times. But if you only inflate car tires or need a lighter, more portable tool, the M12 gives you great performance at a lower cost. Check current prices on Amazon to see the exact difference.
My Final Verdict
The Milwaukee M18 Inflator 2848-20 is my overall winner for heavy duty jobs. It delivers 150 PSI and fills a 33-inch light truck tire in under a minute, which is exactly what you need when you’re working with big tires or equipment. The M12 Compact Inflator is a solid runner-up for lighter tasks — its 120 PSI and 3.09-pound weight make it perfect for car tires and portability, but it can’t match the M18’s raw power.
If you’re on the fence, ask yourself what you’ll be inflating most often. If it’s truck tires, trailers, or anything over 120 PSI, stop second-guessing and get the M18. If you mostly top off passenger car tires and value a lighter tool, the M12 will serve you well.
Winner: Milwaukee M18 Inflator 2848-20
- Fastest 18V Cordless Tire Inflator: Top off 33" Light Truck Tires in Under...
- Optimized for Passenger, Light Truck and Other Medium Duty Tires
- Accessories: Includes All Brass Schrader Chuck, Inflation Needle, Inflator...
This is the inflator for anyone who needs real power for truck tires, equipment, or high-pressure jobs. The 150 PSI max and sub-minute fill time for 33-inch tires make it the clear choice for heavy duty work.
Runner-Up: Milwaukee M12 Compact Inflator 2475-20
- Fastest Cordless Tire Inflator: Top-off a car tire in under 1 minute...
- High efficiency pump and motor for true 120 PSI capability.
- Fills a LT truck tire in under 4 minutes (30-45 psi).
Best for people who prioritize portability and mostly inflate car tires. At just 3.09 pounds with a compact 6.5-inch footprint, it’s easy to stash anywhere and still gets the job done for light to medium duty tasks.
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