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Model # 3651-20

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M18 18V Lithium-Ion Compact Brushless Cordless 1/4 in. Impact Driver (Tool-Only)

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  • Compact size while being lightweight and portable
  • Brushless motor delivers 1,700 in-lbs of torque and 3600 RPMs
  • Features 3 torque speed settings to match speed with application
  • View More Details

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Product Details

About This Product

The MILWAUKEE® M18™ Compact Brushless ¼” Hex 3-Speed Impact Driver is more compact and capable. Measuring only 4.4" in length and 2.1" in width, the compact size allows for better access in tight spaces while being lightweight and portable. The 3-Mode Drive Control™ provides greater control over output speed and power. The brushless motor technology provides 1,700 in-lbs of torque and up to 3600 RPMs for faster speed and increased productivity. MILWAUKEE® REDLINK™ Intelligence optimizes the way M18™ REDLITHIUM™ batteries work with the cordless impact driver for best-in-class performance. Premium components and an all-metal gear case provide the durability that professionals require. The Compact Brushless ¼” Hex 3-Speed Impact Driver is part of MILWAUKEE® M18™ system, fully compatible with over 250+ solutions.

Highlights

  • Compact size allows for unrivaled access in tight spaces
  • Brushless Motor delivers the power to quickly complete most common applications
  • Includes 3-Mode Drive Control for easier control
  • Professional Durability with all metal gearcase and gears
  • 0-3600 RPMs
  • 1,700 in-lbs. of Peak Torque
  • 4.4" in Length and 2.1" in Width
  • 1.7 lbs tool only
  • 5 year tool warranty
  • Compatable with 250+ solutions
  • Includes: M18 Compact Brushless 1/4" Hex 3-Speed Impact Driver (3651-20)
  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Product Information

Internet # 325593197

Model # 3651-20

Additional Resources

Shop All Milwaukee

Specifications

Dimensions: H 7.7 in, W 2.1 in, D 4.4 in

Dimensions

Product Depth (in.)

4.4 in

Product Height (in.)

7.7 in

Product Width (in.)

2.1 in

Details

Battery Amp Hours

No Battery

Battery Power Type

Lithium Ion

Battery Voltage (V)

18V

Battery/Charger

Tool Only

Charger Included

Charger Not Included

Color Family

Red

Cordless Tool Type

Impact Driver

Cordless/Corded

Cordless

Drive Size

1/4 In. Hex

Included

Tool Only

Maximum Speed (RPM)

3600 RPM

Motor Type

Brushless

Number of Total Batteries Included

0

Power Tool Features

LED Light

Product Weight (lb.)

1.7 lb

Returnable

90-Day

Tools Product Type

Power Tool

Torque (In-Lbs)

1700

Warranty / Certifications

Manufacturer Warranty

5 year tool warranty

Questions & Answers

What is the torq
BySep 27, 2026
1 Answer | 
Answer This Question

The M18 Compact Brushless 1/4" Hex Impact Driver Kit (3650-21P) delivers 1,700 in-lbs of peak torque and up to 3,600 RPM.

By|Sep 29, 2026


    Doesn’t have enough torque to remove old CV axles?
    BySep 3, 2026
    1 Answer | 
    Answer This Question

    No, a 1/4 in. impact driver is not intended for CV axle removal.

    By|Oct 26, 2026

      (1)

      What’s the voltage description
      ByAug 13, 2026
      1 Answer | 
      Answer This Question

      The M18 18-Volt Lithium-Ion Compact Brushless Cordless 1/4 in. Impact Driver Kit with One 2.0 Ah Battery, Charger & Tool Bag voltage is 18V.

      By|Aug 14, 2026


        Would this be suitable for an older woman, my friend Tyler‘s mom needs an impact.
        ByJul 18, 2026
        0 Answer | 
        Answer This Question

        Can I bring my old one in and swap it out
        ByJul 6, 2026
        1 Answer | 
        Answer This Question

        No you can't

        By|Oct 3, 2026


          what does it mean free with purchase
          ByJul 2, 2026
          1 Answer | 
          Answer This Question

          it.. it's free... with your purchase.

          By|Oct 6, 2026


            Can you use it to change a tire on a car or a truck
            ByJun 13, 2026
            2 Answers | 
            Answer This Question

            No, you will need a 1/2” impact driver for that. This is mainly for driving screws and smaller fasteners.

            By|Jul 27, 2026

              No — the M18™ 1/4" Impact Driver (Compact Brushless) is not suitable for changing vehicle tires.

              By|Jun 17, 2026


                How to prevent from over tightening?
                ByJun 1, 2026
                1 Answer | 
                Answer This Question

                Hey Paul. Milwaukee compact brushless impact drivers are designed with enhanced variable‑speed trigger control, which is your primary protection against over‑driving fasteners.

                By|Jun 10, 2026


                  Viewing 1-8 of 71

                  Customer Reviews

                  4.7 out of 5

                  • 4.7 out of 1,900 reviews
                  • 77% recommend this product
                  Filter by:
                  Showing 1-10 of 1,900 reviews
                  Best drill
                  [This review was collected as part of a promotion.] I like hot, compact and how durable it is. And it's very light and it's something you can use to do very different projects and nice nice full charge. I love everything about it. And I appreciate the opportunity with # influence.
                  by
                    • Recommended
                    Great size and lots of power for daily use
                    [This review was collected as part of a promotion.] I love this upgraded impact from Milwaukee. My old one that I have is not brushless and is more bulky. This one fits in the hand nicely and with being smaller it definitely helps with screwing in snug places. My only complaint is that it did mention it will come with a battery and charger which it did not, but my previous impact was also M18 so I was able to use those.
                    by
                      • Recommended
                      10/10 recommend
                      [This review was collected as part of a promotion.] Tou really can’t go wrong with Milwaukee, their tools are always reliable and built to last. Love how portable and powerful this little impact driver is. Fits comfortably in your hand, easy to maneuver in tight spaces , and speed setting give you total control. Heavy duty quality without feeling heavy at all
                      by
                        • Recommended
                        Works great and I like the speed options.
                        [This review was collected as part of a promotion.] Great quality, love these impacts. Works great and I like the speed options. Good right out of the box. Last Milwaukee lasted a long time, I expect this one to do the same.
                        by
                          • Recommended
                          Gen 3 on left vs new gen 4 on right. I upgraded to the new Gen 4 and I like. The gen 3 did great for me and never had an issue with it. The new one is lighter, more compact and more power! Trigger control is nicer. I especially like the tri led light up front vs single light on old one. The gen 3rd did have a bit holder opposite side of belt clip. The new one does not. Not a deal breaker but I did try to switch bit holder from old one to new one. It screws on but doesn’t fully seat properly so it’s not 100% compatible without doing some modifications to bit holder. They do make bit holders you can purchase for the new gen 4 if you have to have one. But it was nice that the gen 3 already came with one. Besides that gen 4 is better in every single way!
                          by
                          I like the compact design and cordless convenience of this Milwaukee M18 FUEL impact wrench. The 1/2-inch drive and pin-detent socket retention are useful features for garage projects.
                          by
                          Milwaukee never fails. This impact driver is such a great tool. Light weight, short, powerful and very durable. It can fits to many tiny areas where other impacts can fit. This is a small impact, but I tell you what its got a lot of power behind it and its lighter than most impacts. I love it. Im glad I got it. Switched to Milwaukee a couple of years ago and got many Milwaukee tools, but this is my favorite one.
                          by
                          This drill works great for what I need to use it for!
                          by
                          I have been extremely impressed with this tool. I received it when purchasing a Milwaukee drill and considered it a significant bonus. It has a lot of torque, so be sure you have high quality bits when using.
                          by
                          Awesome tools! Been using it nonstop ever since i got it
                          by
                          Showing 1-10 of 1,900 reviews

                          Compare Key Features

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                          Product Snapshot

                          Ideal for professionals who need power and portability, the M18 Compact Brushless Impact Driver delivers 1, 700 in-lbs of torque in a compact size.
                          Ideal for customers who want the fastest, most compact impact driver, ensuring maximum workspace visibility.
                          Ideal for professionals who want quiet operation and powerful, efficient driving with less vibration.
                          Ideal for professionals wanting unmatched power, speed, and ultimate trigger control for diverse applications.

                          Torque Output

                          1, 700 in-lbs
                          1500 in-lbs.
                          1000 in-lbs
                          2000 in-lbs

                          Battery Capacity

                          No battery included
                          Tool Only

                          Power Source Cordless

                          Brushless Motor

                          Speed Settings

                          3
                          4-Mode Drive Control
                          3 modes
                          4