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Internet # 330351033

Model # R8646K

Store SKU # 1011706657

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18V Cordless Reciprocating Saw Kit with 4.0 Ah Battery and Charger

$139.00
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  • Powerful Motor And Enhanced Ergonomics
  • Combo Includes: 4.0 Ah Lithium-Ion Battery And 18V Charger
  • RIDGID 18V - Free Parts and Service for Life with Registration
  • View More Details

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Product Details

About This Product

The RIDGID R8646K 18V Reciprocating Saw Kit with 4.0 Ah Battery and 18V Charger delivers a powerful 3,000 strokes per minute (SPM) along with a 1-1/8 in. stroke length to quickly cut through tough jobsite materials. The R8646B has a conveniently located side-lever tool-free blade release for quick and easy blade changes. This 18V reciprocating saw features a superior ergonomic handle for enhanced user comfort. The included battery and charger are compatible with all RIDGID 18V Tools. As always, this RIDGID 18V Reciprocating Saw is 100% compatible with all RIDGID 18V batteries. Best of all, this tool is backed by the Industry’s Only Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, Free Service, For LIFE. The R8646K includes the Reciprocating Saw, Wood Cutting Reciprocating Saw Blade, 4.0 Ah Battery, 18V Charger, and Operator’s Manual.

Highlights

  • Powerful motor delivers 3,000 strokes per minute (SPM)
  • 1-1/8 in. stroke length for faster cutting
  • Enhanced ergonomic design delivers superior comfort and control
  • Easy access side-lever tool-free blade release for fast and easy blade changes
  • The included 4.0 Ah Battery and 18V Charger are compatible with all RIDGID 18V Tools
  • 100% Compatible: Works with all RIDGID 18V Batteries, Tools, and Chargers
  • Lifetime Service Agreement with registration within 90 days of purchase
  • Includes: (1) R8646B Reciprocating Saw, Wood Cutting Reciprocating Saw Blade, (1) R87004 18V 4.0 Ah Battery, (1) R86093 18V Charger, and Operator’s Manual
  • RIDGID: Build for a Lifetime
  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents
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Product Information

Internet # 330351033

Model # R8646K

Store SKU # 1011706657

Additional Resources

Shop All RIDGID

Specifications

Dimensions: H 6 in, W 3.5 in, D 16.5 in

Dimensions

Product Depth (in.)

16.5 in

Product Height (in.)

6 in

Product Width (in.)

3.5 in

Details

Battery Amp Hours

4 Ah

Battery Power Type

Lithium Ion

Battery Size

18-volt

Battery Voltage (V)

18V

Battery/Charger

1 Battery & Charger Included

Charger Included

Charger Included

Color Family

Orange

Cordless Tool Type

Reciprocating Saw

Cordless/Corded

Cordless

Cuts Through

Wood

Included

Battery Included, Blade(s), Charger

Length of Stroke (in.)

1.125 in

Motor Type

Brushed

Number of Total Batteries Included

1

Power Source

Battery

Power Tool Features

Keyless Blade Change, Variable Speed

Product Weight (lb.)

5 lb

Returnable

90-Day

Strokes per Minute

3000

Tools Product Type

Power Tool

Warranty / Certifications

Manufacturer Warranty

Lifetime Service Agreement

Questions & Answers

The trigger is stuck in the ON position. How can I release it?
ByAug 3, 2026
1 Answer | 
Answer This Question

Hello, Helen - Thank you for the question. If you would, please contact us by phone at 1.866.539.1710, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Cordless Reciprocating Saw (Tool Only) (R8646B).

By|Aug 4, 2026


    Can this cut a tree limb?
    ByJun 29, 2026
    1 Answer | 
    Answer This Question

    Hello, Mike - This product can be used for cutting all types of wood products (lumber, plywood, paneling, composition board, and hard wood). It has a 1-1/8" stroke length. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.866.539.1710, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Cordless Reciprocating Saw Kit with 4.0 Ah Battery and Charger (R8646K).

    By|Jun 30, 2026


      Can I use the battery pack from the Ridgid drill with this saw?
      ByJun 23, 2026
      1 Answer | 
      Answer This Question

      Hello, Cailb - Yes, you can use that 18V battery with this saw. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.866.539.1710, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Cordless Reciprocating Saw (Tool Only) (R8646B).

      By|Jun 24, 2026


        Is it variable speed?
        ByJun 22, 2026
        1 Answer | 
        Answer This Question

        Hello, Kbc365 - Yes, this saw has a variable speed trigger. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.866.539.1710, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Cordless Reciprocating Saw (Tool Only) (R8646B).

        By|Jun 24, 2026


          Can you use a blade longer than 6-1/2 with this tool? If so, what is the longest blade that can be used?
          ByMay 21, 2026
          1 Answer | 
          Answer This Question

          Hello, Joseph - Yes, you can use a blade up to 12" long. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.866.539.1710, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Cordless Reciprocating Saw Kit with 4.0 Ah Battery and Charger (R8646K).

          By|May 23, 2026


            Is there really a difference between the Ridgid cordless reciprocal saw ( not the brushless one) and the ryobi. I’ve had to replace the gear in my ridgid twice now, and it’s the same part as the Ryobi. Is there a difference other than color? Thanks
            ByDec 4, 2025
            1 Answer | 
            Answer This Question

            Hello, Brettc18 - While some internal parts may look similar, there is certainly a meaningful step up in overall performance, durability, and build quality between the brushed RYOBI and the comparable RIDGID reciprocating saw. RIDGID tools are engineered and tested to handle heavier-duty, more frequent use, and the saws are built with tighter tolerances, stronger housings, and a higher duty cycle in mind. If you need further support, then feel free to ask another question. You can also contact us by phone or text at 1.866.539.1710, Monday - Friday from 9 am to 5 pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Cordless Reciprocating Saw Kit with 4.0 Ah Battery and Charger (R8646K).

            By|Dec 5, 2025


              This saw can cut scew
              ByOct 26, 2025
              1 Answer | 
              Answer This Question

              Hello, Wessam - Yes, this saw can cut through a screw. If you need further support, then feel free to ask another question. You can also contact us by phone or text at 1.866.539.1710, Monday - Friday from 9 am to 5 pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Cordless Reciprocating Saw Kit with 4.0 Ah Battery and Charger (R8646K).

              By|Oct 27, 2025


                Can this replace my battery R840087?
                BySep 18, 2025
                1 Answer | 
                Answer This Question

                Hello, John - Yes, this battery can replace the R840087. If you need further support, then feel free to ask another question. You can also contact us by phone or text at 1.866.539.1710, Monday - Friday from 9 am to 5 pm (EST), or via email when you visit us at https://register.ridgidpower.com/contact. This question is from RIDGID 18V Lithium-Ion 4.0 Ah Battery (AC87004_OLDER).

                By|Sep 19, 2025


                  Viewing 1-8 of 35

                  Customer Reviews

                  4.7 out of 5

                  • 4.7 out of 389 reviews
                  • 81% recommend this product
                  Filter by:
                  Showing 1-10 of 389 reviews
                  Since being introduced to 18 volt Ridgid Tools 8-10 years ago by a Home Depot employee, I have exclusively bought them because of their LIFETIME WARRANTY, the only one among all the competition ... and that warranty even INCLUDES THEIR BATTERIES! I have a big modular plastic toolbox that is so FILLED with 18volt Ridgid Tools that I just had to buy another last week after buying two more, a Ridgid Jig Saw and a Ridgid Oscillating Tool. My name is Bill and I confess: I am addicted to Ridgid Tools. These Lithium batteries hold a charge better than any batteries I have ever had, bar none. What more could you ask for?
                  by
                  This review is from 18V Lithium-Ion 4.0 Ah Battery
                  • Verified Purchase
                  6 found this review helpful
                  Issues less than an hour of Use.
                  I like the Rigid brand. It has a great warranty. I expect I won't need their warranty. I had batteries and 2 other Rigid tools so got this saw. Less than 1 hour of use and it started vibrating badly like it was unbalanced. The blade release also was acting up. I registered it and noticed when getting the SN that wires were sticking out from the motor.. Uneven rotation solved bad motor connections. Very disappointed.. 2 problems within hours of it being delivered. Losing time on job.
                  by
                  Response from RIDGIDMar 25, 2024
                  Hello, Lsvnh - We're sorry to hear that your saw isn't working correctly! It’d be great to speak with you so we can get this matter resolved as soon as possible. If you would, will you please email us at Reviews@RIDGIDmail.com? ridgidtti
                    2 found this review helpful
                    A great implementation of a great tool.
                    I am a bit of a fan of Rigid tools, especially their cordless tools. This cordless reciprocating saw keeps with their high standards for fit, finish, ergonomics, ruggedness and quality. It has great power and heft making it very efficient for the task. I’m a fan of its locking features for both blade and trigger. It makes a great additio. To my tool collection.
                    by
                    • Recommended
                    Cordless convenience
                    We already had a reciprocating saw but it is corded and not so easy to use in certain applications. The RIDGID 18V Cordless Reciprocating Saw is battery operated and makes using it so much easier because you can literally take it anywhere. The saw comes with one woodcutting blade. It has a convenient side lever keyless blade release that's easy to access. It has a lifetime warrantee on parts and service if registered within 90 days.
                    by
                    • Recommended
                    3 found this review helpful
                    Terrific cordless reciprocating saw!
                    My husband loves his new RIDGID cordless 18v reciprocating saw. He said it’s powerful and well-made. The handle has a good grip material to make it easier to hold while using. The saw blade is easy to insert and remove. You’ll need to purchase the battery and its charger separately. RIDGID provides a “Lifetime Service Agreement” for the reciprocating saw and its parts with details on their website.
                    by
                    • Recommended
                    3 found this review helpful
                    Sawzall Recepricating saw
                    Another Ridgid high quality tool, very easy to use and care for, light weight and very easy to use. I use mine for demolition work, cutting branches off small trees. The blade is very easy to change and is compatable with all sawzall blades. You need to hang on tight when cutting steel studs or pipes as it wants to jump and get stuck. So nice to have battery power and no cords. This is the only way to go now.
                    by
                    • Recommended
                    3 found this review helpful
                    Excellent No Frills 18V Recip Saw
                    The Ridgid R8646B is TOOL ONLY and represents the solid, but no bells and whistles two-handed cordless reciprocating saw in the Ridgid lineup. It is lightweight, yet powerful. Blade changing is tool free with a blade clamp lever on the side of the body. Extending the Pivot Foot requires a 5mm Hex Tool (not included). The body of the saw is covered with soft over-molded textured grip. The saw is easy to hold and hang onto.
                    by
                    • Recommended
                    6 found this review helpful
                    Great Saw For Those Unique Jobs
                    It’s fall in the Midwest and time to safely trim the trees. My old corded reciprocating saw died last year and it’s time to upgrade to battery power. Since I already possess a Ridgid battery powered circular saw I decided to go with this saw. I attached the battery after removing the saw from the box and noticed how well balanced it was. The saw grips well and runs quiet. The blade loads easily with the flip of a thumb switch. A safety lock prevents the trigger from activating. This will be a nice addition to my power tool box.
                    by
                    • Recommended
                    5 found this review helpful
                    Love this saw!
                    I'd had a corded reciprocating saw for a few years now and it's really nice to have, but this cordless Ridgid reciprocating saw is super convenient. I'm doing a reno on an old house and there are countless times I've needed a reciprocating saw and there was no electricity available where I was working. Also, working on a ladder, you don't want to be dragging a cord with you up a ladder. This saw has a good, ergonomic design and it comfortable to grip. It has a on/off switch on top and a quick release blade changing mechanism that makes it super easy to switch out the blade. It also has a locking feature so that the saw cannot be accidentally turned on I suppose. This doesn't seem to be covered in the manual. At least I didn't see it anywhere, but who knows. I thought it was to keep the blade running without having to hold the trigger down, but I couldn't seem to get it to work that way, so I figured it was just to prevent accidental turning on like if you threw it in your tool box and the trigger got hit. It seems to have good power. The blade that comes with it is rather short, something you might see in a jigsaw or something and it didn't seem to cut a metal screw off very well, but I'm sure a different blade would work better and they look like it will use a universal blade design. I think they need to improve the manual a bit to cover the lock on the handle more clearly.
                    by
                    • Recommended
                    5 found this review helpful
                    Very nice cordless saws-all with capability equal to my plug-in Saws-all.
                    This is an excellent addition to my RIDGID 18V tool collection. Since I already have a 4AH battery that came with my 1/2" hammer-drill, Tool Only was a good way to go. The saw (with battery attached) is well balanced and a nice balance of weight to be heavy enough to control vibration but not too heavy to use for extended periods. It has tool-less blade changing that works great and a trigger lock which is a nice safety feature. I used the blade that came with the saw to cut a 1" thick piece of dry red oak and compared cutting efficiency to my older corded Saws-all. The 2 tools were comparable with this saw cutting slightly faster. The advantages of a cord-less tool will make this my go-to saw unless making more cuts than the battery can handle which is rare. I did not determine battery life but I don't expect it to be an issue since I don't tend to use this type of saw for extended periods.
                    by
                    • Recommended
                    1 found this review helpful
                    Showing 1-10 of 389 reviews

                    Compare Key Features

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                    Product Snapshot

                    Great for homeowners looking for a powerful reciprocating saw, making tough cuts easier and more efficient. This saw features a tool-free blade release and comfortable ergonomic design.
                    Great for homeowners looking for versatility, making tough cuts easier and more efficient.
                    Great for homeowners looking for a powerful and efficient reciprocating saw, making demolition and cutting tasks easier.
                    Great for homeowners looking for cordless power, making tough cuts easier. This reciprocating saw boasts a powerful motor and tool-free blade changes for efficient operation.

                    Power (Amp or Volt)

                    18V
                    20V
                    18V
                    18V

                    Stroke Length

                    1-1/8 in
                    1.125 in
                    1-1/4 in.
                    1-1/8 in

                    Variable Speed Control

                    Orbital Action

                    Battery Life