Model#: DEWNDCST990B

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Brand new items;Full manufacturer warranty available
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Dewalt DCST990B 40V MAX XR Cordless Lithium-Ion Brushless 15 in. String Trimmer (Bare Tool)

  • Dewalt DCST990B 40V MAX XR Cordless Lithium-Ion Brushless 15 in. String Trimmer (Bare Tool)
  • Note: Battery & Charger sold separately
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Frequently Bought Together


The DEWALT DCST990B 40V MAX Lithium-Ion XR Brushless 15 in. String Trimmer (Bare Tool) features a brushless motor that provides more runtime and longer life with a more efficient and more durable motor. It has a patented gear drive design that provides more torque and maintains cut speed under load. This is contained within a metal gear case for better durability for heavy use. The impact-resistant Xenoy housing offers maximum durability for every day usage. It has a variable speed trigger which gives you precise speed control when needed with power and performance to tackle thick growth, as well as a padded auxiliary handle that offers comfort for long use. This trimmer has a dual 0.080 in. line with a bump feed head that gives the user control over the feed rate, along with a 15 inch cutting swath to help you get the job done faster.
  • 15 in. cutting swath with 0.080 in. line (also accepts 0.095 in. line)
  • High-efficiency brushless motor maximizing run time and motor life
  • Patented gear drive design that powers through overgrowth
  • Variable trigger with Hi/Lo speed control for added power or extended runtime
  • Part of the 40V MAX system of Outdoor Power Equipment
  • 40V MAX XR Cordless Lithium-Ion Brushless 15 in. String Trimmer (Bare Tool) - DCST990B
  • Bare Tool - Batteries and Charger Sold Separately
Compliance and Restrictions
warning: --


Series: 40V MAX XR
Cordless: Yes
Weight: 13 lbs.
Batteries Included: 0
Battery Type: Li-Ion
Cutting Width: 15 in.
Line Diameter: 0.080 in.
Line Feed System: Dual Line Bump Feed
No-Load Speed (RPM): 0 - 6,600
Speed Settings: 2
Voltage: 40V



5.0 / 5.0
1 Review
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great trimmer
Just unboxed the new DCST990M1 and a new DCB407 7.5 ah battery. Took 2 1/2 hours to charge. Runs perfect and is what I needed instead of problematic gasser or dragging 100 feet of cord. Great rig.
December 9, 2017
Originally posted at

Questions & Answers

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Browse 3 questions Browse 3 questions and 3 answers
What is the run time of the 40V battery?

Is the 13 # weight include the battery?

Thank you
Jon on Jul 4, 2016
BEST ANSWER: Roughly around 30 mins
How do change or add string.
How do you add new string?
A shopper on May 20, 2017
BEST ANSWER: how do I change the string
how much difference between 20v and 40v lithium string trimmer?
EMS on May 12, 2016
BEST ANSWER: 40v is heavier, more power and run time.