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Model # R4120

Internet # 100618246

Store SKU # 187336

15-amp 12 in. Compound Miter Saw with Laser

This item has been discontinued.
The Home Depot no longer carries this specific product.




Model # R4120

Internet # 100618246

Store SKU # 187336

The RIDGID 15 amp 12 in. Compound Miter Saw with Laser features a heavy duty motor that delivers up to 4000 RPM to help you power through hard woods and tough jobs. You can make bevel cuts from 3 to 48 degrees and miter cuts from 0 to 50 degrees for versatility for a wide variety of cuts. The Exactline laser alignment system makes it easy to align the blade with the cut line.

California residents: see  Proposition 65 information

  • 12 in. blade with 1 in. arbor for easy blade changes
  • Laser guide to help you accurately follow cut marks and keep the saw aligned with the cut
  • Sliding left fence to support taller materials and adjust for bevel cuts
  • Soft-touch controls for comfortable operation and grip
  • Front-mounted clamp for securely holding the material in place
  • Left side table extension for material support
  • 2-1/2 in. dust port to connect to standard dust-collection systems to help keep your work area clean
  • UL listed
  • 3-year manufacturer warranty
  • Lifetime service agreement with registration within 90 days of purchase (begins after the warranty period expires)
  • UL listed

Info & Guides

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Blade Diameter 
12 in 
Product Depth (in.) 
28.1 in 
Product Height (in.) 
18.5 in 
Product Width (in.) 
22.6 in 
Amperage (amps) 
Arbor Size 
1 In. 
Bevel Type 
Color Family 
Cord Length (ft.) 
Corded Tool Type 
Miter Saw 
Dust collection type 
Keyless/keyed blade change 
Maximum Cutting Thickness (in.) 
Maximum Degree Miter Cuts - Left 
Maximum Degree Miter Cuts - Right 
Miter Saw Type 
Power Tool Product Type 
Product Weight (lb.) 
46 lb 
Tools Product Type 
Power Tool 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 
Manufacturer Warranty 
3 year warranty, Lifetime Service Agreement within 90 days of registration 


Rated 4.2 out of 5 by 84 reviewers.
Rated 1.0 out of 5.0 by Bent Fence I couldn't figure out why when I made trim cuts why they would always be off. Finally a friend of mine came over to use my saw to make a cut and discovered that when a straight piece of wood was placed against the entire length of fence it was tight on the left and right outside points of the fence but where the cut occurs along the fence it is gapped a 1/8+". There is no adjustment for this. I sure hope Rigid maintains their warranty and can replace this. May 24, 2015
Rated 5.0 out of 5.0 by Awesome saw! I purchased this saw to re-trim our our home. It handled it all with ease and has since proved invaluable during countless other construction projects. . I find the laser difficult to aim but have no trouble lining up the cuts manually. I am not really sure the laser is all that useful for me anyway. This thing is heavy. Buy the cart and you will be much more likely to use this saw. Also, a quality blade is as important as anything else in a saw like this. May 20, 2015
Rated 5.0 out of 5.0 by Great Performance Excellent powerful miter saw...I have had this 12" Compound Miter Saw for four years without problems.. I make rustic style furniture with different grades of wood. I like that the miter cuts go further than 45 degrees with clean cuts. Since I had this saw I have cut over three hundred hickory tree spalings between 3" to 5" in diam. these tree spalings are very hard wood, cutting with no problems. I also purchased the Ridged stand which is also very good quality. I give this machine a 10 with all honesty. If you are a woodworker and need a saw that won't give you problems this is the one at a great price also. November 24, 2014
Rated 4.0 out of 5.0 by Great Saw, One Flaw I bought this machine with the intentions of doing rough and finish carpentry. It works really well for both and does what you would expect it to. The one flaw is that the laser is very difficult to set to precision. I have had my saw for about 3 years now and still haven't fooled with it enough to get it right. Also, the belt chirps upon start up. The machine is 3 years old and runs fine but you cant really trust the metal angle angle adjustment either. It seems that when stored collapsed on the Ridgid cart, it may have tweaked something. I would recommend this however it isn't the most durable of the bunch November 24, 2014
Rated 5.0 out of 5.0 by Best compound miter saw I have ever owned. This compound miter saw has the brute force of a chain saw with the finess of a scroll saw. Everything I have thrown at it it cuts with absolute ease and control, from 6 x 6 timbers to 1/4 molding. The laser is accurate and the blade brake if very fast. The work clamp is especially handy when working solo. This beast is definitely worth having in your work shop. The life time warranty is just icing on the cake. December 12, 2014
Rated 4.0 out of 5.0 by This saw has performed flawlessly. It has been sometime now since I purchased my saw and I don't usually give reviews, but this saw has performed above my expectations. I've cut large timbers, intricate miter cuts and framed numerous projects with this saw. The dust collection could be improved on this saw but everything else performs great. I highly recommend the foldable table for this saw for ease of storage, mobility and the extendable arms for cutting long boards. November 24, 2014
Rated 5.0 out of 5.0 by Most accurate cutting saw I have ever used This miter saw cuts dead on 90 degree angles right on the money every time. Easy to adjust to any angle even compound angles. Easy to change saw blades.. Best saw, most accurate saw I have ever used. when selecting and moving from the preset miter angles the angles locks in smoothly and accurately every time. I highly recommend this saw, for any lever of user from home owner or professional ! Buy this saw ! November 24, 2014
Rated 5.0 out of 5.0 by Couldn't have done my living room renovation without my RIDGID tools! I used my RIDGID tools to custom-make all of the window framing and trim for my living room renovation and they exceeded my expectations. I could not have done it without my RIDGID Compound Mitre Saw, Portable Table Saw and Hand Tools. My neighbor borrowed them to do a small project. He liked them so much that he went out and bought one of each for himself. That's the greatest testament to quality. November 25, 2014
  • 2015-10-07T09:17:24.144-05:00
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