Dewalt DCG412B 20V MAX Cordless Lithium-Ion 4-1/2 in. Cut Off Tool (Tool Only)

Model: dewndcg412b
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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
Dewalt DCG412B 20V MAX Cordless Lithium-Ion 4-1/2 in. Cut Off Tool (Tool Only) Model: dewndcg412b
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Product Features & specs :

Dewalt DCG412B 20V MAX Cordless Lithium-Ion 4-1/2 in. Cut Off Tool (Tool Only)

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.
  • 2-finger trigger switch with lock-off button for convenient activation and easier gripping
What’s Included:
  • 5 in. X 1/4 in. T27 Metal Grinding Wheel
Power Source
UL Safety
Wheel Diameter
4-1/2 in
No-Load Speed (RPM)
CSA Safety
Switch Settings
Wifi compatibility
Batteries Included
Battery Type
Case Included
Bluetooth Compatibility
Motor Type
Spindle Thread
5/8 in - 11 in
Variable Speed
Switch Type
Charger Included
ETL Safety
Battery System
16.75 in.
4.75 in.
7.31 in.
6 lbs.
Warranty Term
3 Year

Reviews :

4.6 / 5.0
66 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend this product?
Yes (42)
No (1)
Easy To Use (42)
Powerful (35)
Ergonomic Design (23)
Lightweight (5)
Short Run Time (if applicable) (1)
Best Uses
Frequent Use (4)
Small Projects (4)
Home Repair (4)
Jobsite (4)
Great value for the DIY-er
I bought this after finding the need to cut through some metal at the house. It worked for its intended purpose perfectly but i find myself reaching for it for more and more uses. It has come in handy multiple times and has way tons more uses than originally thought. I've ground concrete down with this, i've cut metal, i've sanded wood even. Super useful tool to have around the house!
This review was collected as part of a promotion
June 4, 2020
Originally posted at
love this tool,very smooth running
other than going thru batteries quickly,smoothest,best balanced grinder i have,use it daily
April 25, 2020
Originally posted at
handy on the farm
Bought this tool and use it in my mobile repair shop, I use exclusively cordless tools as i rarely have AC power. I use 4ah batteries and have had no issues.
December 31, 2019
Originally posted at
Multiple uses!
I have had this grinder for a few months now. The blades are easy to switch out. The grinder itself is easy to use. You are able to move the guard plate To whatever position you need it for. I’ve used it to grind off nails, cut porcelain and ceramic tiles, even smooth out concrete surfaces. This grinder has multiple uses. Just be sure to get the proper blade for your project.
This review was collected as part of a promotion
November 6, 2019
Originally posted at
Never lets me dowm
Have had this for a while now and its old reliable.
This review was collected as part of a promotion
November 6, 2019
Originally posted at
Good for light work
Had this grinder for a while now. Have done both light and heavy grinding (not a lot of heavy grinding due to its efficiency) but a lot of light work. Smaller tasks that dragging a cord out wouldn’t be worth your time. Not the most efficient model due to it not being brushless but, it a base model. Also likes to get a little warm after a while. Overall I’m pretty satisfied for what I paid for it.
This review was collected as part of a promotion
November 6, 2019
Originally posted at
Handy as a shirt Pocket!
I’ve had this grinder for a couple years and it is far and away the most versatile addition to my 20v Max collection. I use it often with a cut off wheel and it works fantastic! The battery life will surprise you and it has more power than a typical corded grinder.
This review was collected as part of a promotion
November 5, 2019
Originally posted at
Very good tool
Excellent offering from Dewalt. Very easy use. Wish I had cut cors years ago.
September 28, 2019
Originally posted at
Best Value
I use my grinder for cutting cast iron pipes, unistrut, you name it and I have had little to no problems. I really enjoy the ergonomic feel and the hand guard. I had the xr grinder but I returned it and got this one just for the guard. Only thing is it will eat a 2ah battery in 30 minutes of use, which isn’t bad at all for a cordless machine that can cut through steel like butter but not ideal for a full work day. However if you get yourself a pair of 6ah batteries you’ll bet set to cut through a tank.
Anyway great tool,
Thanks Dewalt
July 29, 2019
Originally posted at
LOCK feature
Recently just bought this grinder and I love it. I have the cord grinder but I have always wanted a cordless grinder for when I need it when there is no outlet near by or if I’m to lazy to plug in my other grinder. Very portable and easy to use. I love the locking feature makes it safe to change discs.
This review was collected as part of a promotion
June 26, 2019
Originally posted at

Q & A :

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 12 questions Browse 12 questions and 23 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


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.