Model#: DEWNDCG412B

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Brand new items;Full manufacturer warranty available
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New items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

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

  • Note: Battery & Charger sold separately
New $129.00
Recon $99.00
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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
Length: 16.75 in.
Width: 4.75 in.
Height: 7.31 in.
Weight: 6 lbs.
Batteries Included: 0
Battery Amp Hour: 3 Ah
Battery System: 20V MAX
Battery Type: Li-Ion
Bluetooth Compatibility: No
CSA Safety: Yes
Case Included: No
Charger Included: No
ETL Safety: No
Motor Type: Brushed
No-Load Speed (RPM): 8000
Power Source: Electric-Cordless
Spindle Thread: 5/8 in - 11
Switch Settings: Lock-off
Switch Type: Trigger
UL Safety: No
Variable Speed: No
Voltage: 20V
Wheel Diameter: 4.5 in
Wifi compatibility: No



4.7 / 5.0
56 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (40)
No, I would not recommend this to a friend (1)
Easy To Use (41)
Powerful (33)
Ergonomic Design (21)
Lightweight (4)
Short Run Time (if applicable) (1)
Best Uses
Frequent Use (3)
Home Repair (3)
Small Projects (2)
Jobsite (2)
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
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Battery Longevity (if applicable)
Best Uses
Home Repair
Great grinder when ac power not available
From the amount of time I have been able to use this it is great, haven't done any grinding, but did use cutoff wheels. It cut great, didn't have to charge battery for the task I did. I truly believe in the brushless "stepper motor" tools, they are fast and powerful. One problem I did encounter is after years of using the typical spanner wrench to tighten cutting wheel, this did not come with the traditional type of wrench. I had an Allen wrench included in the box. The bag where the extra handle and wrench normally would be was torn open and the Allen wrench put in. I was sent a new unit as a warranty replacement, it came with the Allen wrench also. After looking closely at the nut that holds the cutting wheel, noticed two 180 deg apart had hex cuts in the hole for the Allen wrench. There wasn't any mention of using the Allen wrench for tightening the nut. That is Dewalt's poor instructions.
June 21, 2019
5 months ago
Describe Yourself:
Avid Do-it-Yourselfer
great Tool
This is 5th one of these I have purchased; all from Tyler tool. They work great, so this is the reason I have a different one for different tools: Grinder, big and small wizzer wheels, stainless wire wheels both cup and flat wheel.
April 24, 2019
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Battery Longevity (if applicable)
Best Uses
Frequent Use
i’m very happy with this purchase very good service
very very good product and fast delivery thanks
April 22, 2019
6 months ago
Describe Yourself:
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Best Uses
Frequent Use
Small Projects
Home Repair
Great tool
I bought this tool for cutting metal siding for 2 new storage sheds that I built for my dock. It worked great with plenty of power to cut the metal. I have also used it to cut off 1/2" bolts.Understanding its a battery tool, its great for cutting a variety of projects. I'm not sure that its the right tool for heavy duty use.
April 22, 2019
6 months ago
Describe Yourself:
Avid Do-it-Yourselfer
It's lightweight and easy to use, I have used it several times and it has worked well.
April 19, 2019
Another great tool.
Another great tool by the wall. Battery technology is amazing.
March 3, 2019
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

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 1 Year
Price: $129.00 $99.00
You Save: N/A $30.00 (23%)


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.