Greenworks 21" Mower Replacement Blade
$21.99
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4.8 out of 5 stars with 348 reviews
5 out of 5 stars
17 May, 2026
originally posted on greenworkstools.com
Quality Blade Construction
[This review was collected as part of a promotion.] This is a well designed blade with a balance construction and sharp edges for quality lawn care. It’s also well coated with green powder coated paint for corrosion resistance and durability. I highly recommend the green works blade over a regular box store brand.
5 out of 5 stars
1 May, 2026
originally posted on greenworkstools.com
Fit like a gem!
[This review was collected as part of a promotion.] Ordered replacement blades for our 21" self-propelled 80v mower. Fit perfect, bolted right on — alignment marks made it real easy to get everything lined up. Took it out on the lawn and you can definitely tell the difference in a new, sharp blade..
3 out of 5 stars
4 April, 2026Verified purchase
(no review title)
Received this item today in a taped up box which led me to believe it had been returned to store previously. No instructions in box. Very poor customer service.
1 reply from Greenworks Tools team - 2 months ago
Hello Judi. Thank you for your feedback. We are sorry to hear about your experience. The replacement blade should arrive in new condition, and we understand your concern regarding the packaging and missing instructions. If you need the installation guide, you can easily find it online by searching the model number of your mower on the Greenworks website under the Support section. This will provide the correct manual with step-by-step instructions. If you prefer, you can also contact Greenworks and request a copy to be sent to you directly. If you believe the item you received is not in acceptable condition, we recommend reaching out to the retailer for an exchange or return. We appreciate you bringing this to our attention and will share your feedback with our team. They can be reached either using the online chat function, on Greenworks Tools page, accessible by clicking “Chat Now” in the bottom corner of your screen, Chat with a Live Agent or by calling 1-888-909-6757.
5 out of 5 stars
25 September, 2025
originally posted on greenworkstools.com
OEM Quality
[This review was collected as part of a promotion.] I ended up getting my Greenworks mower from a neighbor that was moving away. I ordered a new blade after seeing that the one on it was pretty badly chipped up. This one was exactly like one i removed. Paint finished was great and the blade had a perfect edge on it. this thing cuts great. Zero complaints and price was fair.
5 out of 5 stars
20 September, 2025
originally posted on greenworkstools.com
Perfect Replacement Blade
[This review was collected as part of a promotion.] Perfect fit. Exactly like the blade that came on mower. Solid price as well.
5 out of 5 stars
16 September, 2025
originally posted on greenworkstools.com
Easy to replace and great
[This review was collected as part of a promotion.] The replacement blade is of exceptional quality. In contrast, my previous blade exhibited unusual behavior.
5 out of 5 stars
1 September, 2025
originally posted on greenworkstools.com
Easy peasey mower blade replacement
[This review was collected as part of a promotion.] Needed a new mower blade and it was surprisingly easy to replace it. Love my Greenworks mower
5 out of 5 stars
9 September, 2024
originally posted on greenworkstools.com
Fits perfectly.
Fits perfect. Hate the plastic bolt though. This issue with the plastic bolt is that the edges round so had to use vice grips to take it off and put it back on. Would like a metal bolt replacement but cant find one.
5 out of 5 stars
5 September, 2024
originally posted on greenworkstools.com
Excellent replacement blade
[This review was collected as part of a promotion.] Fits perfectly. Easy installation. Finally cut the grass instead of bending it!
5 out of 5 stars
1 September, 2024
originally posted on greenworkstools.com
Backup plan.
[This review was collected as part of a promotion.] I bought a second blade from the company so I could have a backup if needed when having the blade sharpened, and rotating blades if needed. It has worked as I planned!
5 out of 5 stars
29 August, 2024
originally posted on greenworkstools.com
Non OEM Blade
[This review was collected as part of a promotion.] Perfect replacement for OEM blade. Replacement blade not available from box store that sold the mower.
5 out of 5 stars
29 August, 2024
originally posted on greenworkstools.com
Sharp, well balanced blade
[This review was collected as part of a promotion.] Not much to say. Was easy to install and cuts the grass cleanly.
5 out of 5 stars
28 August, 2024
originally posted on greenworkstools.com
Works great
[This review was collected as part of a promotion.] Wanted to have an extra blade just in case. This one is perfect just like the original.
5 out of 5 stars
27 August, 2024
originally posted on greenworkstools.com
'I took all 21 inches' and...
[This review was collected as part of a promotion.] 'YIKES!' Said my tall grass, which was cut down to size thanks for the 21 inch blade of steel! No grass was able to stand up to the big 21 incher. 'I took all 21 inches, and I couldn't take any more' said my greenworks mower
5 out of 5 stars
26 August, 2024
originally posted on greenworkstools.com
Replacement blade
[This review was collected as part of a promotion.] fits perfect, lawn mower makes clean cuts to the grass
5 out of 5 stars
22 August, 2024
originally posted on greenworkstools.com
Good OEM Part
[This review was collected as part of a promotion.] Good OEM replacement part. Installed with out issue, fit perfectly.
5 out of 5 stars
22 August, 2024
originally posted on greenworkstools.com
Very good blade.
[This review was collected as part of a promotion.] Great replacement blade. Very sharp, easy to replace.
5 out of 5 stars
19 August, 2024
originally posted on greenworkstools.com
Great blades and easy to install
[This review was collected as part of a promotion.] These blades are very easy to replace. I needed two new blades and these were perfect for my 80v 21” mower.
5 out of 5 stars
19 August, 2024
originally posted on greenworkstools.com
Perfect replacement
[This review was collected as part of a promotion.] Perfect replacement for current blade. Simple job to replace.
2 out of 5 stars
17 August, 2024
originally posted on greenworkstools.com
Not compatible with MO40L410
My mower is listed for this blade. It does fit the motor attachment on the mower, but it is too long for the mower. It's rubs the chassis.
1 reply from Greenworks team - 2 years ago
Hello TWilson. Thank you for reaching out to us. We are sorry to hear the part was not compatible, unfortunaly we were unable to find the model/ERP number (MO40L410 2507802) listed in the chart . The replacement blade part number for this mower is: (Item#: 2908902; Item#:2903402); this information can be found in the owner's manual. The actual blade length is approximately 1" shorter than the mower deck size to allow clearance between the blade tip and deck edge. We hope this information helpful. Should you have any further questions or need support finding a Greenworks part, contact us through Live Chat on www.greenworkstools.com or call Greenworks Pro toll-free helpline 1-855-345-3934. We would like the opportunity to speak with you to see if we can find a solution.