Model#: DEWNDCG412B

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New items with possible minor cosmetic damage; CPO 120 day money back guarantee
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Dewalt DCG412B 20V MAX Cordless Lithium-Ion 4-1/2 in. Cut Off Tool (Bare Tool)

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  • Note: Battery & Charger sold separately
New $109.00
Recon $99.99
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The DCG412B 20V MAX Lithium Ion 4-1/2 in. / 5' in. Grinder increases productivity with features like Quick-Change wheel release, convenient trigger switch with lock-off button, and extended run-time battery.
  • 8,000 RPM motor provides high power for cutting and grinding applications
  • Tool-free guard allows for quick and easy guard adjustments/positioning
  • 2-position side handle offers greater control, comfort and versatility
  • Quick-Change Wheel Release allows for tool free wheel changes without the need for a wrench
  • 2-finger trigger switch with lock-off button for convenient activation and easier gripping
  • 20V MAX Cordless Lithium-Ion 4-1/2 in. Cut Off Tool - DCG412B
  • 2-Position Handle
  • Type 27 Grinding Guard
  • Hex Wrench
  • 5 in. X 1/4 in. T27 Metal Grinding Wheel
Compliance and Restrictions
warning: This product can expose you to Lead, which is known to the State of California to cause Cancer and Birth Defect/Reproductive Harm. For more information go to


Series: 20V MAX
Cordless: Yes
Weight: 6.6 lbs.
Batteries Included: 0
Battery Type: Li-Ion
RPM: 7000
Spindle Thread: 5/8 in. - 11
Switch Type: Trigger
Voltage: 20V
Wheel Diameter: 4-1/2 in.



4.6 / 5.0
46 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (37)
No, I would not recommend this to a friend (1)
Easy To Use (38)
Powerful (30)
Ergonomic Design (18)
Lightweight (1)
Short Run Time (if applicable) (1)
Best Uses
Frequent Use (1)
Small Projects (1)
Home Repair (1)
Jobsite (1)
Awesome tool for the everyday job
This tool is my go to for any and all cut-off needs. Won't go on a jobsite without it.
This review was collected as part of a promotion
November 12, 2018
Originally posted at
Always close at hand
I added this to my Dewalt tool list and it was the best thing I ever did. Working in my garage this grinder always has a cutoff wheel on it. Zip your done. What hacksaw, its in its place in the tool box. This is the best way to go.
July 9, 2018
Originally posted at
Works but has issues
The grinder works well for short duration, light duty cuts and grinding. Don't count on it for anything that requires run times of much more than a couple of minutes before resting the same amount of time.

I was away from my shop and did not have my trusty old corded grinder with me. Lowes was close to the job I was on. I had been wanting a cordless, brushless model, but Lowes did not have that model in stock. Since I had to have a grinder I got this one. It works, but like the previous poster mentioned. It eats batteries. I have two, 2 amp batteries that came with my brushless drill and impact driver set. One of those batteries will run this grinder less that 10 continuous minutes before it shuts off. By that time the battery is so hot that it cannot recharge until it cools. The second battery runs down and heats up before the first battery has cooled enough to charge. So, now I have 2 batteries too hot to recharge. This heat level is not good for the battery life either. One of my 2 amp batteries failed to ever recharge after a couple of these cycles. Dewalt did replace it free of charge, but you have to pay for shipping. So I was without it for over a week while I got around to getting it replaced.

If I let a battery cool but not recharge, it will run my drill or impact driver for a significant time before requiring a charge.

The lesson is, for less that 15 minutes of grinding, you need more than 2 hours of charge time. Dewalt does have 3, 4, 5 and 6 amp 20vMax batteries. I would like to try one but they are expensive and I have not needed one that badly yet. I do wonder if the larger 5 or 6 amp battery will heat up as much as these 2 amps I have. I am surprised the manual does not recommend a battery for this. I notice when you buy a grinder with a battery instead of a bare model, it comes with 5 amp battery

I would hold out for the brushless model if I could do it over. If you have extending grinding to do, get your extension cord out!!!
April 20, 2018
Originally posted at
Amazing tool
Amazing tool going to buy a 5 amp battery though eats the plain 20 volt pretty quick
January 31, 2018
Originally posted at
Awesome Grinder
Very powerful grinder, easy to change discs and easy to handle. Tons of power and will make quick work of most metals. It comes with a grinding wheel so its pretty much ready to go out of the box (if you have battery packs.
January 10, 2018
Originally posted at
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Short Run Time (if applicable)
Best Uses
Small Projects
Home Repair
Tool performs well, but you need to have at least 2 heavy duty batteries, i was grinding concrete and even letting the tool glide over the surface that i was grinding, the battery last only 15 min and even letting the tool rest a minute o 2.
September 5, 2017
Describe Yourself:
Avid Do-it-Yourselfer
Yes, I would recommend this to a friend
Easy To Use
Best Uses
Frequent Use
good tool
Great for a quick cut or grind of metal without dragging out a cord. We also put cut off wheels in it and use it to cut rebar, bolts and nails.
December 4, 2016
over 2 years ago
Describe Yourself:
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
August 25, 2016
Describe Yourself:
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Great tool .
Buy 2 big battery''s if your using it on a daily basis. I use it every day for many different jobs. But eats up too much power.
July 6, 2016
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
grind away
seems to work just fine
June 22, 2016

Questions & Answers

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Browse 6 questions Browse 6 questions and 12 answers
Is this compatible with the xr 20v battery.
mickey on Apr 16, 2016
BEST ANSWER: Yes, XR and MAX batteries are compatible.
Thank you,
Mark Kamprud
Director of Operations
Vertex Group LLC
The instructions (and this web site) state that the tool comes with a Type 1 cutting guard. But my cutting guard is open faced, not two sided, which I understand to be the Type 27 cutting guard. I also noticed that reviews from another web site state that they received this tool with a Type 27 guard. Which guard did yours come with?
Jim Mancave on Feb 27, 2016
BEST ANSWER: Not the one in the CPO picture, the more one sided open style, and I did buy 2 at 2 different times.
Sent from my iPad
Can I use this to wheel out boats with a 7 inch buffing wheels the riyobe shuts off
f on Feb 15, 2016
BEST ANSWER: No, I would not recommend that unit to buff a boat. The Dewalt DWP849x would be a much better option for what you are trying to accomplish.
will this work with the 20v max lithium ion slide in battery-DCB203 Battery pack??
A shopper on Sep 28, 2017
BEST ANSWER: Yes it will
wil accept a 5 inch blade?
firhooks unlimited, inc on Dec 14, 2014
BEST ANSWER: That unit will not accept a 5 inch blade.
is the motor brushless??
Q H on Jun 20, 2018

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: 20V MAX Cordless Lithium-Ion 4-1/2 in. Cut Off Tool - DCG412B,
2-Position Handle,
Type 27 Grinding Guard,
Hex Wrench,
5 in. X 1/4 in. T27 Metal Grinding Wheel
20V MAX Lithium-Ion 4-1/2 in. Grinder - DCG412BR,
Two-Position Handle,
Type 1 Cutting Guard,
Availability: In Stock In Stock
Warranty: 3 Year Limited 1 Year Limited
Price: $109.00 $99.99
You Save: N/A $9.01 (8%)


Most DEWALT® Tools purchased on or after January 1, 2004 come with a warranty package that includes:

Three-Year Limited Warranty. DEWALT will repair, without charge, any defects due to faulty materials or workmanship for three years from the date of purchase. This warranty does not cover part failure due to normal wear or tool abuse. For further detail of warranty coverage and warranty repair information, visit or call 1-800-4-DEWALT (1-800-433-9258). This warranty does not apply to accessories or damage caused where repairs have been made or attempted by others. This warranty gives you specific legal rights and you may have other rights which vary in certain states or provinces.

One-Year Free Service Contract. DEWALT will maintain the tool and replace worn parts caused by normal use, for free, any time during the first year after purchase.

90-Day Money Back Guarantee. If you are not completely satisfied with the performance of your DEWALT Power Tool, Laser, or Nailer for any reason, you can return it within 90 days from the date of purchase with a receipt for a full refund - no questions asked.