Model#: DEWNDCST920B

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Dewalt DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer (Bare Tool)

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  • Dewalt DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer (Bare Tool)
  • Note: Battery & Charger sold separately
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The DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer provides precise power control with a variable speed trigger as well as performance and run time management with the Hi/Lo speed control switch. The patented gear drive design will provide more torque and maintain cut speed under load, while the dual-line bump feed head clears a full 13 inches. Well balanced and only 8.5 lbs. with a 20V MAX 5.0 Ah Lithium-Ion battery, the string trimmer easy to maneuver and puts less stress on the user.
  • 13 in. cutting swath
  • Brushless Motor maximizing motor efficiency and durability
  • Dual 0.080 in. line with bump feed
  • Lightweight and ergonomic design
  • Variable speed trigger and speed control
  • Patented gear drive design
  • 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer - DCST920
  • Auxiliary Handle
  • Guard
  • 0.080 in. Line Pre-wound Spool
  • Bare Tool: Battery and Charger Sold Separately
Compliance and Restrictions
warning: --


Series: 20V MAX XR
Cordless: Yes
Weight: 8.5 lbs.
Batteries Included: 0
Battery Type: Li-Ion
Cutting Width: 13 in.
Drive Shaft Type: Straight
Line Diameter: 0.080 in.
Line Feed System: Bump Feed
No-Load Speed (RPM): 0 - 6,000
Voltage: 20V



4.4 / 5.0
56 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (36)
No, I would not recommend this to a friend (1)
Powerful (29)
Easy To Use (23)
Lightweight (22)
Value (16)
Heavy (3)
Short Run Time (if applicable) (2)
Uncomfortable to Use (1)
Best Uses
Small Projects (11)
Frequent Use (10)
Large Projects (4)
Heavy Duty Requirements (3)
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Battery Longevity (if applicable)
Best Uses
Frequent Use
Amazing tool!!!
Amazing,light weight, plenty power!! Just like all my orher dewalt tools!! Chain saw, hedge trimmer, blower and drills!!! No more gas or eletric tools for me!!! Sold on 20V Dewalt!!!
April 13, 2019
1 month ago
So nice to not pull a cord!
This performs like a gas powered weed whacker without all of the annoying small motor problems that come with the traditional style. I love it. Wish I would have bought it sooner.
February 25, 2019
Not Dewalts best tool for what I need.
Too heavy, a lot of the weight is on the front end which is very hard on my bad back. Unit is not able to edge which I find to be a minus. I love all my other Dewalt tools. This would be a tool that would be useful to knock down heavy weeds in a field or along a fence line.
December 27, 2018
I bought this trimmer a couple of months ago and all it does is eat the string. The base is already worn out and won't even fit properly anymore. I've spent most of my time winding the string through it after it eats it. Do Not Buy This Product. Huge Disappointment!
November 23, 2018
Originally posted at
Perfect for the yard
Bought this about 3 months ago and love it. its light weight enough that i don't need to get a belt, more quiet that a gas trimmer and no need to mess with oils and gas. I get about 45 mins with the 6 ah flexvolt battery, operation is fool proof. Wroks great!
This review was collected as part of a promotion
November 19, 2018
Originally posted at
Awesome power
I bought this last year and I have to say it was the best thing I did it's so much better than gas trimmers and one battery lasts for my whole house..I can't wait to get the lawnmower to add to my collection
This review was collected as part of a promotion
November 13, 2018
Originally posted at
Not worth it.
It worked for about a year. The finger power/throttle controls began to work intermittently and now have failed completely.
October 15, 2018
Originally posted at
Superior Product
The best lawn trimmer I have ever used. I have been mowing lawns since 1962
October 12, 2018
Originally posted at
Great String Trimmer
I bought this along with the hedge trimmer in the spring to replace a gas unit. This thing has not disappointed! I am very pleased with the power and the instant start to the motor. No more pulling rope to start the motor. The only con to this unit is the guard. It is a little undersized and it does allow a lot of debris to be kicked up. I plan to upgrade to the larger replacement guard.
September 14, 2018
Originally posted at
Great tool
Great tool at a great price!
August 10, 2018

Questions & Answers

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Browse 17 questions Browse 17 questions and 39 answers
Does it use a pre-loaded spool or simply buy separate line?
Sherry B on Jun 15, 2017
BEST ANSWER: Hello, mine came with a bump spool that I would wind on more string when it used up the line on the spool. I replaced the bump head with a Craftsman Hassle Free III Trimmer Line head. If you do that, you will need a nylon bushing from any QP Ace Hardware for about .39 cents.
Are there any optional attachments for the Dewalt 20V trimmer instead of the string line? I love the string, but sometimes would like more.
GEnlew on Sep 1, 2017
Dewalt DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer (Bare Tool)
Dewalt DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer (Bare Tool)
Dewalt DWO1DT802 0.080 in. x 225 ft. String Trimmer Line
Dewalt DWO1DT802 0.080 in. x 225 ft. String Trimmer Line
BEST ANSWER: Unfortunately, attachments are not available for this trimmer
Bare tool means battery not included?
Moyra b on Jun 10, 2017
BEST ANSWER: Yes. The bare tool means there are no batteries. If you already own a dewalt power tool that takes a 20V Max Li-I battery (amps do not matter) then it will be compatible with this.
I have a recent model DeWalt cordless drill with 20V battery pack. It doesn't say 5A on the battery I have. Will it fit and power this tool? If so, will it work for decent amount of time? I have a very small yard.
ChillyWilly on Jun 2, 2016
BEST ANSWER: Yes. As long as the battery is 20v and Li-Ion
How to change the string?
A shopper on Mar 9, 2019
BEST ANSWER: You will have the instructions inside the manual to replace the string. If you need any further assistance, you can contact the technician directly at 1-800-433-9258.
How long can it run while ime trimming until I would recharge it again and does it have other attachment?
Bob rock on Jul 30, 2016
BEST ANSWER: That depends on the battery used. Dewalt offers (5) 20v batteries that vary in Amp Hours. To acquire the longest run time, we would recommend purchasing the 5 amp hr battery (model DCB205) that could extend your run period for 60-65 minutes depending on how it's used.
Will regular 18v batteries work with this tool or do they have to be 20v lithium ion?
Shawn on Jul 18, 2016
BEST ANSWER: no, the battery has to be 20V to work with the tool
Can you also reference the battery and charger that goes with this item? I would need to purchase those separately correct?
donna on Jun 7, 2016
BEST ANSWER: Home Depot has a kit with the trimmer "Tool" , charger and one 5AH Battery for $199.99 I just picked it up along with a few others. I am not sure if the deal they had is still going on but they offered an additional 3AH Battery for free with the Trimmer Kit I bought there. I highly recommend this trimmer from Dewalt; the ability to walk around the yard without a cord attached and without having to deal with a gas powered engine and still obtain this amount of power really makes the chore of trimming your lawn kind of fun. Buy one you won't be disappointed, and Definitely try to use the 5AH Batteries over the lower amp ones, This greatly improves the run time & performance of this tool.
Will the 20 v battery used to power other tools work in the weedeater
Julie on May 6, 2016
BEST ANSWER: The battery can be used with any compatible 20v Max unit.
what is the warranty
Dan on Jul 25, 2016
BEST ANSWER: Dewalt tools comes with a 3 year warranty.

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 Lithium-Ion XR Brushless 13 in. String Trimmer - DCST920,
Auxiliary Handle,
0.080 in. Line Pre-wound Spool,
Bare Tool: Battery and Charger Sold Separately
Availability: In Stock Out of Stock
Warranty: 3 Year Limited 1 Year Limited