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Model#: MILN2446-20

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Brand new items;Full manufacturer warranty available
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New items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Milwaukee 2446-20 M12 12V Cordless Lithium-Ion Grease Gun (Tool Only)

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  • Milwaukee 2446-20 M12 12V Cordless Lithium-Ion Grease Gun (Tool Only)
  • Note: Battery & Charger sold separately
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Product Overview


Get up to 25% more pressure, best-in-class runtime, and compatibility with tools for drilling, fastening, lighting and cutting. The M12 Cordless Lithium-Ion Grease Gun delivers the highest max operating pressure in its class to help you handle heavy-duty applications and eliminate downtime. It’s capable of delivering more than 8,000 PSI max operating pressure for heavy machinery, cold weather applications and clogged grease fittings. The M12 REDLITHIUM Battery (sold separately) lets you dispense up to seven grease cartridges per charge and is compatible with a variety of Milwaukee tools for greater workplace versatility. A lightweight, ergonomic handle offers greater comfort during prolonged use, and an onboard hose storage and shoulder strap loop offer convenience with less mess. The gun comes with a 36 in. flex hose with spring guard and grease coupler.
  • Best-in-class runtime: Dispenses up to 7 cartridges per charge
  • Powerful 12V motor: Delivers more than 8,000 PSI max operating pressure
  • Onboard fuel gauge: Helps you increase productivity and avoid interruptions
  • M12 Lithium-Ion system: Compatible with more than 20 tools for greater
  • versatility
  • REDLITHIUM Battery Technology: Superior pack construction, electronics, and performance deliver more work per charge and more work over pack life than any battery on the market
  • Integrated hose storage: Adds convenience
  • Air bleeder valve: Priming mechanism provides quick flow
  • M12 12V Cordless Lithium-Ion Grease Gun - 2446-20
  • Tool Only - Battery and Charger Sold Separately
  • 36 in. Flex Hose with Spring Guard
  • Grease Coupler


Series: M12
Cordless: Yes
Length: 14 in.
Width: 3 in.
Height: 9.75 in.
Weight: 7.2 lbs.
Amp Hour: 3 Ah
Batteries Included: 0
Battery System: M12
Battery Type: Li-Ion
Bluetooth Compatibility: No
CSA Safety: Yes
Case Included: No
Charger Included: No
Cylinder Capacity (Bulk): 16 oz
Cylinder Capacity (Cartridge): 14.5 oz
ETL Safety: Yes
Flow Rate(volume per minute): 2.6 oz/min at 1000 PSI
Motor Type: Brushed
Operating Pressure (PSI): 8150
Powered Tool Power Source: Electric - Cordless
UL Safety: Yes
Voltage: 12V
Wifi compatibility: No



4.6 / 5.0
51 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (20)
No, I would not recommend this to a friend (1)
Lightweight (8)
Easy To Use (7)
Powerful (4)
Best Uses
Frequent Use (1)
Heavy Duty Requirements (1)
Large Projects (1)
Small Projects (1)
Once we got the air out, and the gun primed, it worked well, I mean very well.
August 31, 2019
Millwaukee 12v grease gun
I have only used it once to grease my skid loader, but it worked perfectly.
August 31, 2019
Absolutely love it so much I bought a 2nd one
August 21, 2019
Totally awesome!
Definitely recommend this product. Greased my dump trailer wheel bearing where are you pump in new grease and the old grease squishes out the front. Always had hand repacked bearings. Pumped in four wheels 2 1/2 tubes of grease . What a huge blessing not have to work grease handle.
June 17, 2019
Great tool for grease my excavator
For my daily grease of my excavator, it is really great tool.
June 16, 2019
Originally posted at
M12 grease gun
It is lightweight and easy to use, once you go cordless and Milwaukee you won't go back
May 30, 2019
Works just as it should. Fast shipping too.
May 28, 2019
Dread grease job just got easier
Can’t believe I lived without this tool. Have tractor an boat that I always hated to grease. But with this new m12 grease gun it’s a breeze. No more arthritis from pumping an a lot cleaner to use.
May 7, 2019
Originally posted at
Very Tough!
I work as a mechanic on highway snow plows. One of the operators greased his truck with this unit. He forgot where he left the grease gun. When he backed out of the shop he found the grease gun with the tire!
The battery busted but popped in a new battery and the grease gun still works!
I am super impressed with this unit.
May 6, 2019
Originally posted at
This will pay for itself in the first week or so in lubrication time saved over a manual pump gun.
When there is the option, I generally go with the M18 Fuel version of a Milwaukee cordless tool. I have some M12 stuff, but 3 to 1 for M18 tools and batteries. I love all of my M12 Fuel tools though and this grease gun is no exception. I decided to go with this one over the M18 version for 3 reasons. Cost was the biggest factor with the M12 tool only being roughly half of the M18 tool only grease gun. Next was weight. The M12 version is reported to be over a pound lighter. Plus the M12 4.0 XC batteries are lighter, and physically smaller than M18 4.0+ XC or 9.0 and 12.0 HD/HO batteries. Lastly I just didn't need some of the features the M18 version has. All we are doing is greasing bushings on logging equipment. We're not too concerned about over lubrication. If we put a little too much in a pin and bushing it just squirts out of the seal. That's how you know when to stop pumping anyway. I will say that I was worried about the 8500 psi max output pressure of this one vs. The M18 having 10000 psi max. It hasn't been a problem in the real world yet though, even on stubborn alemites. If it's that hard to pump grease ona bushing its probably either time to replace the alemite or knock the pin out of the bushing and clean everything up anyway to see where the problem is. More pressure might work a little while longer but you still have a problem to figure out and fix.

We couldn't be happier with our little M12 grease gun. So much easier to start grease on a picky or stubborn alemite. You know the kind where you have to hold the hose at just the right angle and just the right pressure down on the fitting, and work the handle super slow so nothing moves, or otherwise grease just jumps out around the alemite but not in it. Everyone has at least one problem child like that. This gun won't solve that problem, but it sure is handier now for one person where sometimes you just had to have one person pumping and another holding the hose on the fitting. Not anymore. That alone paid for this grease gun in the first week of ownership.

I am probably going to get a second M12 grease gun for the shop. This first one will live out it's life on the work truck and in the woods. I'm not getting it back anytime soon. The good news is I have plenty of old school grease guns now at the shop. Everyone wants to only use this little Milwaukee now.

Battery life is another concern, or at least a question I had before I bought this one. I had some extra 2.0 M12 batteries that I never use (I tend to use the 4.0's because the tools are more stable standing up on them than the little 2.0's) and put a fully charged one in the grease gun and primed the hose with a new tube of grease. I believe we are on tube #3 and the 2.0 battery is still half charged. It is looking like we will get between 4 and 6 tubes on a fully charged 2.0 M12 battery. We have a 12V M18/M12 battery charger either way, but I doubt we'll be using it more than once a week for this little grease gun even on a little 2.0 M12 battery. Pretty impressive to me.
March 31, 2019

Questions & Answers

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Browse 3 questions Browse 3 questions and 3 answers
Does this come with a case?
A shopper on May 17, 2018
BEST ANSWER: No, Milwaukee (Bare Tools) do not come with a case.
Will this gun work with the smaller 1.5ah batteries? If so how well does it work?
Chris on Mar 21, 2015
BEST ANSWER: Yes,as long as the 1.5 ah battery that your speaking of is 12 volt.Power is the same,just less run time.
What is the difference in M12 round end and M12 square end? Can you use either kind as long as its 12v?
BUFF on Mar 23, 2013
BEST ANSWER: Your question would be best answered by Milwaukee. They can be contacted directly at 1-800-729-3878.

New Vs. Reconditioned

What's the difference between New and Factory-Reconditioned?

Factory-Reconditioned products have been returned to the manufacturer and are restored to like-new operating condition; they go through a rigorous testing and inspection process. Plus, they offer a significant savings vs. new.
  • Reconditioned products may have minor cosmetic blemishes or scratches that do not affect item performance.
  • Reconditioned products may not come with all of the consumables the new version comes with (bits, sanding pads/papers, cases, etc.).
  • Both come with a manufacturer warranty and are covered by our Money Back Guarantee; New is 30 days, Reconditioned is 120 days.
Condition: New Factory Reconditioned
Features: Same Same
Specs: Same Same
Includes: M12 12V Cordless Lithium-Ion Grease Gun - 2446-20,
Tool Only - Battery and Charger Sold Separately,
36 in. Flex Hose with Spring Guard,
Grease Coupler
M12 12V Cordless Grease Gun (Tool Only) - 2446-80,
Tool Only - Battery and Charger Sold Separately,
36 in. Flex Hose with Spring Guard,
Grease Coupler
Availability: In Stock Out of Stock
Warranty: 5 Year 5 Year


The Milwaukee Warranty Every MILWAUKEE power tool is tested before leaving the factory and is warranted to be free from defects in material and workmanship. MILWAUKEE will repair or replace (at MILWAUKEE's discretion), without charge, any tool (including battery chargers) which examination proves to be defective in material or workmanship from five (5) years after the date of purchase. Return the tool and a copy of the purchase receipt or other proof of purchase to a MILWAUKEE factory Service/Sales Support Branch location or MILWAUKEE Authorized Service Station, freight prepaid and insured. This warranty does not cover damage from repairs made or attempted by other than MILWAUKEE authorized personnel, abuse, normal wear and tear, lack of maintenance, or accidents.

The warranty period for V28, M12 and M18 Li-Ion Battery Packs is two (2) years from the date of purchase. XC M18 Battery packs carry a (3) year warranty. The warranty period for Ni-Cd Battery Packs, Flashlights, Radios, and Professional Hoists (lever, chain, and electric) is one (1) year from the date of purchase.

*The warranty period for Portable Generators is two (2) years from the date of purchase.



This warranty gives you specific legal rights. You may also have other rights that vary from state to state and province to province. In those states that do not allow the exclusion of implied warranties or limitation of incidental or consequential damages, the above limitations or exclusions may not apply to you. This warranty applies to the United States, Canada, and Mexico only.

Please call Milwaukee Electric Tool Corporation for warranty questions at 800-729-3878