Model#: MILN2101-21

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Milwaukee 2101-21 4V Cordless M4 Lithium-Ion 1/4 in. Hex Screwdriver with 2.0 Ah RedLithium Battery

  • Milwaukee 2101-21 4V Cordless M4 Lithium-Ion 1/4 in. Hex Screwdriver with 2.0 Ah RedLithium Battery
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  • Due to federal regulations, this product can only be shipped within the continental US. Express delivery not available.


Featuring 44 in-lbs. of peak torque and a 21-position clutch with auto shut-off, the new screwdriver offers improved torque control during repetitive applications. Two speeds (0 - 200 RPM / 0 - 600 RPM) offer further user control for precision work and at only 9.6 in. in length and under one pound, the M4 Screwdriver is easy to use with one hand, featuring a 1/4 in. quick-change chuck for one-handed bit changes.Drilling more than 200 holes per change, the M4 Screwdriver is the first tool to feature Milwaukee's RedLithium 2.0 Ah battery on the new M4 platform, offering up to 50% more runtime.
  • 44 in-lbs. of torque and a 21- position clutch setting with auto shut-off offer improved torque control.
  • 2 speed gear box produces 0 - 200 RPM / 0 - 600 RPM for optimal user control for precision work
  • Lightweight and compact at only 0.85 lbs. in weight and 9.6 in. in length
  • 1/4 in. quick-change chuck for one-handed bit changes
  • 4V Cordless M4 Lithium-Ion 1/4 in. Hex Screwdriver - 2101-21
  • 4V M4 2.0 Ah RedLithium Battery - 48-11-2001
  • 4V M4 Charger - 48-59-2001


Cordless: Yes
Length: 9.6 in.
Width: 1.56 in.
Height: 1.56 in.
Weight: 1 lbs.
Drive: 1/4-in
Drive Type: Hex
RPM: 0 - 200 / 0 - 600
Torque: 44 in-lbs.
Voltage: 4V

More Versions Of This Item

Item Name Price
MILN2101-22 Milwaukee 4V Cordless M4 Lithium-Ion 1/4 in. Hex Screwdriver Kit
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4.7 / 5.0
20 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Yes, I would recommend this to a friend (19)
Easy To Use (4)
Powerful (3)
Ergonomic Design (2)
Lightweight (2)
Lack of Power (1)
Short Run Time (if applicable) (1)
Best Uses
Home Repair (3)
Frequent Use (2)
Small Projects (2)
Yes, I would recommend this to a friend
Milwaukee, enough said.
I use my tools at work and at home.
If it doesn't say Milwaukee, I don't buy it.The battery life are exellent and charges in minutes. I can say no wrong with Milwaukee.
November 3, 2013
Yes, I would recommend this to a friend
Works great!
Received it the next day after placing my order. Used it right away to drill some small screw holes in a narrow opening. Good Quality, easy to use.
March 8, 2014
Yes, I would recommend this to a friend
Very Handy Tool
Very nice tool for getting into tight places. Good battery mount and dismount. Trigger is a little akward.
March 8, 2014
Yes, I would recommend this to a friend
Excellent Tool
Had to remove and then re-install multiple screws from a panel. Tool performed flawlessly and efficiently. I really enjoy the battery level meter in the handle! I look forward to abusing this tool some more in the future. It's Milwaukee tough!
March 10, 2014
Yes, I would recommend this to a friend
Review Milwaukee 4V Cordless Screwdriver
Very convenient for installing door and cabinet hardware, electrical switches, outlets and plates. This is a replacement for a similar Milwauked screwdriver that I have used for over 10 years (and it's still working)
March 12, 2014
Yes, I would recommend this to a friend
milwakee cordless screwdriver
running a remodeling business...this screwdriver is great and makes the job easier
March 12, 2014
Yes, I would recommend this to a friend
Small size, big capabilities
This little jigsaw performs "above it's weight," as they say. I thought it would be a good purchase to have just in case - now I'm wondering if I can dump my corded jigsaws! It has sufficient weight to cut cleanly and solidly in just about any material. It doesn't have a pneumatic sawdust clearance system, or occilator, but I lived without those things before. The trigger action is smooth and positive, the saw moves over the surface smoothly and easily, and the design allows one- or two-handed operation. In short, it's a keeper! And buying reconditioned from CPO was a BIG bonus!
March 17, 2014
Yes, I would recommend this to a friend
Another Solid Milwaukee Performer
This is an update of the Milwaukee 4v screwdriver without the rubber overmold. That means it's a solid performer for the smaller tasks, with slower speeds for precision screw driving and a redesigned battery and charger. The 2-way handle - straight or pistol-grip - is a plus. The battery charges in an hour or less, and seems to have very decent life, although I don't have any numbers to back that up. The unit feels solid and is a pleasure to use. Granted, you won't be driving #10 screws without a pilot hole with this thing, but that's not what it's meant for. For most average work, though, it can be a star. For woodworkers, this thing can be a great teammate to your drill.
March 24, 2014
Yes, I would recommend this to a friend
I would buy this tool again
Small jobs around the house
May 6, 2014
Yes, I would recommend this to a friend
Great for what it is.
Ahh, good ole Milwaukee power tools. I got this little beauty as a companion to their M12 Fuel Impact Driver. I use this for very sensitive applications like electronic work, and the Impact for everything else.

When I first took it out of its box, I was surprised with how small it was. The ergonomics are pretty good for it just being basically a 10 inch long shaft. The rubber on the tool feels good on the hands. The transition from it's "Straight" grip to it's "Pistol" grip feels very smooth and feels like it wont go from one to the next on accident while working.

The Battery light indicator is a definite plus to the tool as well. I also really dig the forward clutch, as when it's activated the tool just stops instead of making that annoying clicking noise that most clutch systems do.

This tool has around 40 pounds of torque and 21 clutch setting with about 2 pounds at it's first.

Suffice it to say this thing wont be driving deck screws any time soon. This particular tool was designed with electricians, Computer Tech's, and just regular home owners in mind. I personally find this tool very useful for building computers in my shop.

Overall, I would highly recommend this tool for anybody who wants a good, lightweight, low torque, and very precision oriented tool to preform lightweight and sensitive tasks in their shop.
May 9, 2014

Questions & Answers

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Browse 8 questions Browse 8 questions and 9 answers
Does it come with two batteries? How quick will the battery recharge?
David on Feb 21, 2014
BEST ANSWER: This includes one battery and one charger.
Dear sirs, we are a hand tools / air tools supplier located in Taiwan. we are looking for Milwaukee #2101-21 4V Cordless M4 Lithium-Ion 1/4 in. Hex Screwdriver with 2.0 Ah RedLithium Battery + charger
for our Taiwan local customer, 1. can you quote us with 10 kits? & lead time? 2. also, can you make international shipping to us in Taiwan? 3. can these tools with lithium batteries be shipped by FedEx express to us?

TMD Aircraft Tools Company
Johnny Huang
TEL: 886 4 2253 2955
FAX: 886 4 2254 9724
E-mail :
Johnny on Jun 27, 2016
BEST ANSWER: CPO only ships within the United States at this time.
Is this tool varibale speed and not just a 2 speed gear box
Will it operate at a very slow starting speed?
Captain Crunch on Feb 21, 2014
BEST ANSWER: There are two speeds on the screwdriver, high and low. On the side of the screwdriver there is a speed selector.
Does this come with any bits?
Rick on Feb 21, 2014
BEST ANSWER: The Milwaukee model 2101-21 does not come with any bits.
CAN YOU BUY Lithium batteries for it.
charles on Jan 18, 2014
BEST ANSWER: The model number for the battery is 48-11-2001. You can contact Milwaukee directly at 800-729-3878.
what is the length straight? Not folded.
Mark on Dec 12, 2013
BEST ANSWER: The total length is 10".
Does this have a light.
tools4me on Dec 11, 2013
BEST ANSWER: No, there is no light on the screwdriver.
Does it come with its own charger
Al on Dec 4, 2013
BEST ANSWER: Yes, a 4V M4 Charger - 48-59-2001, is included.


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