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greenworkstools

40V 16" Cordless Battery Brushless String Trimmer (Attachment Capable) w/ 4.0Ah Battery & Charger

SKU 2127402

MODEL# STF457

Miles Can Trim: Up to 2/3 Miles
Runtime: Up to 50 minutes (w/ included battery)
Battery Recharge Time: 120 minutes
Weight: 9.7lbs wo/ battery
Line Feed Type: LOAD N' GO™ Bump Feed
Attachment Capable: Accepts most string trimmer attachments
Warranty: 3-year tool and battery limited warranty
Power 75+ Tools with any Greenworks 40V Battery
What's Included: (1) 4.0 Ah battery and charger

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Product intro

Cordless outdoor power tools are ideal for homeowners like you who are simplifying and focusing on what's essential to getting the most out of life. The Greenworks 40V family of tools are built with medium weight construction and high-efficiency motors. The Greenworks 40V lithium-ion platform powers 75+ outdoor products, including lawn mowers, blowers, string trimmers, chainsaws, hedge trimmers, and much more! The 40V lithium-ion battery provides the power you need, and delivers fade-free power with no memory loss after charging. The Greenworks 40V platform comes with a 3 year tool / battery* warranty to protect your investment. Of high-quality manufacturing, these products are easy to start and lighter weight than the gas products you're used to, making your day of yard work a whole lot easier. Greenworks 40V tools are lightweight, start instantly, and require virtually no maintenance - no gas, no oil, no mess - but still deliver gas-like power.

Key features

Highly efficient 40V brushless motor provides more torque, quiet operation, and longer life
16" cut path with variable speed trigger to provide on-demand power to get through the toughest weeds with ease
Top mounted motor design combined with a steel straight shaft allows for superior balance and ergonomics while trimming your lawn
Attachment capable design that can accept attachments from multiple brands such as Ryobi, TrimmerPlus, Yardworks, and more
.080" dual line bump-feed head provides quick on-demand line advancement to rip through the toughest weeds
Compatible with Greenworks 40V Li-Ion system for higher efficiency and longer run time with an assortment of tools to complete your yard work
Includes 4.0 Ah battery & charger

The No List

No Gas Smell.

No Emissions.

No Maintenance.

Low Noise.

Frequently Asked Questions

What is the difference between auto-feed and bump and feed string trimmers?

Auto-feed string trimmers use centrifugal force to release trimmer line. Each time the unit is activated, the spinning of the trimmer head exerts a force that unlocks the trimmer spool, allowing line to be released. A spring-loaded mechanism relocks the line after approximately 0.25” of line has been release. Therefore, every trigger pull will release line.
Bump feed/ bump and feed string trimmers work with a similar mechanism, but the spool lock is manual disengaged by the user by “bumping” the trimmer head on the ground while the unit is in use. This mechanism provides operators with more control over how much line is used.

Why does my trimmer line keep breaking during use?

For attachment capable string trimmers, the following brands are compatible:
GPoulan Pro, Ryobi-Expand-it and Trimmer plus.
If you are unsure if you have an attachment capable string trimmer unit, please contact us at info@greenworkstools.com.

Why does my trimmer line keep breaking during use?

Trimmer line will break off during use which is a normal occurrence. In harsher terrain or when used to edge the string trimmer's line will break off more often as it makes contact with hard surfaces. To reduce line breakage here are some tips:

Keep the underside of the trimmer head/guard area clean of debris.
Ensure that the cutting blade is clean/clear, and the blade is exposed and shard enough to trim the line. This will also help to reduce excessive line breakage.
Avoid direct contact with hard surface areas when using the string trimmer.
In thicker, denser, and longer grass, you may want to go slower. Listen to the sound of the string trimmer, if it reduces speeds, or slows down too much, back away from the grass and start again at a slower pace.

Can I remove the guard from my string trimmer?

No, string trimmers should never be operated without a guard. The guard is a safety feature and helps reduce debris such as grass clippings from being picked up and flung towards the user. It also has a cutting bar on it to prevent line from overextending and breaking off at large lengths. Operating without a guard will cause the string trimmer to work harder than it must and will reduce the life span of the motor. It will also void the warranty.

Why does my line keep unraveling?

Line unraveling can be caused by winding the spool line the wrong way or simply not winding it tight enough. Please make sure you follow the guide inside your owner’s manual thoroughly as this process may take some time to correctly achieve.

What does reduced gear mean for my string trimmer?

A string trimmer that has a reduced gear motor does not directly drive the trimmer head. Instead, the motor drives a larger gear that is attached to the trimmer head. This reduces the speed of rotation but increases the torque. It allows a smaller, lighter motor to produce extra torque and perform tasks more efficiently, while ensuring that the unit is easy to maneuver.

Does my unit come with trimmer line?

Yes, all GreenWorks string trimmers come with spool and line that has already been installed in your unit.

Can I use a thicker diameter line than what is recommended?

No, we do not advise using a thicker diameter line than what is advised in your owner’s manual. The use of a thicker line may result in over working the motor and could potentially damage the motor resulting in shorter life span of the unit. This will also void your warranty.

Specifications