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Greenworks 21242 40V G-MAX Cordless Lithium-Ion 13 in. String Trimmer
Model#: GWKN21242

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Brand new items;Full manufacturer warranty available
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Greenworks 21242 40V G-MAX Cordless Lithium-Ion 13 in. String Trimmer

Model#: GWKN21242
This item is no longer available.
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  • Important Notice: Lithium-Ion Item - Express Delivery option not available due to transportation regulations.


Important Notice: Lithium-Ion Item - Express Delivery option not available due to transportation regulations.
Become more efficient when working in your yard with the Greenworks 40V G-Max Lithium-Ion Lawn Tool Series, the gas alternative solution you have been waiting on. This interchangeable battery platform offers all the tools you need to complete your yard work without sacrificing performance or power.
Greenwork's 40V Cordless G-Max Lithium-Ion 13 in. String Trimmer delivers the most power and more options in its class making it a strong opponent to its gas powered counterparts. At 9,000 RPM, the 21242 is quieter and will rip through long grass, stubborn weeds and hard to reach areas with ease while lasting 40% longer than its competitors. Designed to work with you, the 21242 telescopic shaft, innovative multiple position swivel head, easy edger converter and variable-speed trigger allow you to rotate and adjust accordingly to each user for enhanced mobility and user experience in order to get the job done faster and more efficiently.
  • Premium power up to 50-min of run time with the G-Max 40V Lithium-Ion 4.0 Ah battery, this trimmer offers a variable-speed option for maximized power to tackle the toughest weeds in your yard
  • Automatic 0.65 in. single feed line
  • Adjustable multi-position cutting path of 10 in. or 13 in.
  • Easy conversion button from trimming to edging and gliding walk behind wheel provide the best result for your yard
  • Flower guard allows you to trim around your flower bed or other hard to reach areas without harm
  • Cushion and over-molded grips increase operator comfort
  • Lock-off switch prevents accidental start ups
  • Please Note: 40V G-Max and 40V Lithium-Ion Batteries are not cross compatible; this tool is compatible with the G-Max 2.0 Ah battery (29462) and the G-Max 4.0 Ah battery (29472)
  • 40V G-Max Cordless Lithium-Ion 13 in. String Trimmer - 21242
  • 40V G-Max 4.0 Ah Lithium-Ion
  • 40V G-Max Lithium-Ion Charger
  • Owner's Manual


Cordless: Yes
Weight: 5.62 lbs.
Battery Type: Li-Ion
Cutting Width: 13 in.
Line Diameter: 0.065 in.
Line Feed: Automatic
Power Type: Electric
RPM: 9,000
Shaft Style: Straight
Shipping Weight: 13.75 lbs.


Product Reviews


by PowerReviews

(based on 3 reviews)


of respondents would recommend this to a friend.

Reviewed by 3 customers

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from EL PASO

About Me Handyman

Verified Buyer


  • Lightweight


  • Uses Lots of Line

Best Uses

  • Trimming Around Rocks
  • Weeds & Tall Grass



Good product

By G Golfer

from Denver, CO

About Me Do-It-Yourself

Verified Buyer


  • Does Two Jobs
  • Easy to Handle
  • Ergonomic Grip
  • No Chords
  • Powerful


  • A Little Heavy For Woman

Best Uses

  • Straight Edging
  • Trimming Around Rocks
  • Weeds & Tall Grass

Really good product. Only 4 stars because it doesn't get as close as wanted around tall boulders, but still does a good job elsewhere

(1 of 1 customers found this review helpful)


Greenworks 40 V G force string trimmer

By Germangeorge

from Sedro

Verified Buyer


  • clean
  • Good for the environment
  • Handling Well
  • Powerful
  • Quiet


  • Might Cost A Little More

Best Uses

  • Clean Up Around The Yard

I have used many other weed trimmers throughout the years,but this one is by far the best one.
To the people using gasoline operated ones I have to your heart out,and have fun while trying to start it up.Geo

  • Was this a gift?:
  • No

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Questions & Answers

Do you have questions about this product?

get answers from real customers and in-house experts with AnswerBox.

2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    What is the difference between this model(21242) and the 21302 model?
    Asked on 5/25/2014 by Spidey from Wisconsin

    1 answer

    • Staff Reviewer


      The difference is the 21302 includes a 40V G-Max 2.0 Ah Lithium-Ion battery. Whereas the 21242 includes a 40V G-Max 4.0 Ah Lithium-Ion battery.

      Answered on 5/27/2014 by Ken from Atlanta, GA
  • Q:

    I purchased a greenworks cordless blower 20v lithium-ion from your company. Is there a weed trimmer that uses the same battery and charger that are cmpatible?
    Asked on 4/19/2013 by Frank from Virginia Beach, va

    1 answer

    • Staff Reviewer


      We do stock at 20v trimmer. The model number is GWKN21072.

      Answered on 4/19/2013 by Ken from Atlanta, GA
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Greenworks Warranty

Double The Industry Standard

NEW GreenWorks products are protected against all defects under normal use for a period of (4) four years (90 days for commercial use) from the shipping date.

Reconditioned GreenWorks products are protected against all defects under normal use for a period of 30 Days from the shipping date.

GreenWorks can opt to repair, replace or issue a refund for products that are determined to be defective, or that have been damaged during shipping. Replacement of products or parts subject to normal wear and tear is the responsibility of the customer. If GreenWorks accepts a return under Warranty, you can return the defective or damaged product only after you call and receive a Return Authorization from GreenWorks. You also will receive a refund for your original shipping charges, and GreenWorks will arrange and pay for your return shipping charges. Batteries carry a one-year warranty against defects in workmanship and materials. Batteries must be charged in accordance with the operator's manuals directions and regulations in order to be valid.

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