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Maxpower 331951B 21-Inch Universal 3-n-1 Lawn Mower Blade

4.4 out of 5 stars 473 ratings
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Available at a lower price from other sellers that may not offer free Prime delivery.

Purchase options and add-ons

  • Universal Replacement for 21-inch Cut Mowers
  • 3 in 1 Blade allows for side discharge, bagging, or mulching
  • 1-inch Center hole with reducing washers in the following sizes: 3/8-inch, 7/16-inch, 9/16-inch, 1/2-inch, 5/8-inch, and 13/16-inch
  • Blade measures 2.25-inch x 21-inch
  • Made in the USA
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Maxpower 331951B 21-Inch Universal 3-n-1 Lawn Mower Blade
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From the manufacturer

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For All Your Outdoor Power Equipment Needs

MaxPower has ALL of your small engine replacement parts. Blades, filters, trimmer line, belts, chainsaw parts, engine parts, wheels, tubes and MORE!!

usa

USA Manufacturer

We proudly manufacture the following items at our facilities in Glennville, GA and Phoenix, AZ:

  • Mower Blades
  • Edger Blades
  • Trimmer Line
  • Foam and cartridge style air filters

Manufacturing Processes

Heat Treat Process for Blades

Heat Treat Process for Mower Blades

trimmer line

Foam Filter Manufacturing

cartridge

Cartridge Filter Line

trimmer lien

Trimmer Line Extrusion

Product details

  • Product Dimensions ‏ : ‎ 66.04 x 10.16 x 7.62 cm; 907.18 g
  • Date First Available ‏ : ‎ Aug. 11 2012
  • Manufacturer ‏ : ‎ Rotary Corporation
  • ASIN ‏ : ‎ B003VPAEIY
  • Item model number ‏ : ‎ 331951B
  • Customer Reviews:
    4.4 out of 5 stars 473 ratings

Product information

Technical Details

Manufacturer ‎Rotary Corporation
Item model number ‎331951B
Product Dimensions ‎66.04 x 10.16 x 7.62 cm; 907.18 g
ASIN ‎B003VPAEIY

Additional Information

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Maxpower 331951B 21-Inch Universal 3-n-1 Lawn Mower Blade

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Product description

Replacement 3 in 1 Universal Blade for 21-inch Cut Mowers

Top Brand: MaxPower

Highly Rated
100K+ customers rate items from this brand highly
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Price$22.49$45.95$47.65$34.99-23%$29.58
List: $38.49		$35.07
Delivery
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Get it Jul 4 - 11
Get it Jul 3 - 10
Get it Jul 8 - 18
Get it Jul 2 - 7
Get it by Monday, Jun 30
Customer ratings
4.44.4 out of 5 stars473
4.64.6 out of 5 stars123
4.74.7 out of 5 stars1,979
4.64.6 out of 5 stars360
4.24.2 out of 5 stars58
4.64.6 out of 5 stars1,558
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Customer reviews

4.4 out of 5 stars
473 global ratings

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Customers say

Customers like the fit, cutting performance, and installation of the product. They mention it fits many models, cuts great, and is easy to install. Customers also appreciate the quality, saying it's heavy-duty and balanced. They also say it's an outstanding piece of outdoor equipment.

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FitPerformanceCutting performanceInstallationQualityReplacementBalanceEasy to replace
17 customers mention "Fit"14 positive3 negative

Customers like the fit of the product. They mention it fits perfectly, works as promised, and would fit many models.

"I purchased this for our yard machine lawn mower. It fit perfect. Old one off, new one on. No fighting with it. Would recommend;)" Read more

"Works and fits as promised." Read more

"Good price fits great" Read more

"Fit my craftsman lawnmower after some trial and error. Lots of washers and spacers for most lawnmowers...." Read more

12 customers mention "Performance"12 positive0 negative

Customers are satisfied with the performance of the product. They mention it works out very well, gets the job done, and the hardware kit works perfectly to solidly retain the blade. Some say it has really helped to ease the operation of the mower.

"...Works pretty well. I wish there were some instructions in the box." Read more

"...Getting clean cuts with this blade and it is performing as hoped." Read more

"...It has really helped to ease the operation of the mower. I recommend this product." Read more

"Well made and the hardware kit worked perfect to solidly retain the blade, blade comes with baked on paint so will never rust, i finely touched up..." Read more

11 customers mention "Cutting performance"11 positive0 negative

Customers are satisfied with the cutting performance of the product. They mention it cuts great, like a hot knife through butter. They also say it's getting the lawn cut.

"...Getting clean cuts with this blade and it is performing as hoped." Read more

&ܴdz;’s getting the lawn cut. I will probably give it a sharpening at some point because I’m fussy and have also been pretty rough on it...." Read more

"...never rust, i finely touched up edge with a file so she cuts like going through butter !" Read more

"...purchased another product (locally) and it is like day and night, cleaner cuts and filling the bag right to the end so I have to dump less often." Read more

11 customers mention "Installation"11 positive0 negative

Customers find the product easy to install. They mention it's of good quality and minimal noise.

"Much more than expected at this unbelievable price, Easy to install perfect fit. Excellent balanced no vibrations as extremely sharp." Read more

"Blade was relatively simple to install...." Read more

"Replacement blade for 40v Ryobi mower. Love it. Easy install and minimal noise. Clean cut... grass, weeds, toes....." Read more

"Easy instal as the OEM basically was installed with all the right washers etc, fit like a glove on our mower...." Read more

11 customers mention "Quality"11 positive0 negative

Customers are satisfied with the quality of the product. They mention it's heavy-duty, balanced, and an outstanding piece of outdoor equipment.

"Well made and the hardware kit worked perfect to solidly retain the blade, blade comes with baked on paint so will never rust, i finely touched up..." Read more

"...times and have gone over a few clumps stopping the blade and it held up very well. Great quality blade." Read more

"Easy to install. Strong." Read more

"Best price I could find on it and I'm very happy with the quality." Read more

6 customers mention "Replacement"6 positive0 negative

Customers are satisfied with the replacement blade. They mention it's easy to install, fabulous for mulching, and a perfect substitute for their Craftsman 21 lawn mower.

"Great replacement" Read more

"Replacement blade for 40v Ryobi mower. Love it. Easy install and minimal noise. Clean cut... grass, weeds, toes....." Read more

&ܴdz;’s a lawn mower blade. It fit, it works, it’s perfect." Read more

"Great replacement Blade. Very easy to install and fabulous for mulching." Read more

3 customers mention "Balance"3 positive0 negative

Customers are satisfied with the product's balance. They mention it's properly balanced.

"...Excellent balanced no vibrations as extremely sharp." Read more

"Heavy duty and balanced...." Read more

"It is properly balanced..." Read more

3 customers mention "Easy to replace"3 positive0 negative

Customers find the product easy to replace. They mention it's very efficient and will pay for itself in fuel savings.

"Easy replace - good price - and solid performance. Way better than sharpening/repairing the old mangled one." Read more

"Easy to swap & VERY efficient - will pay for itself in fuel savings...." Read more

"Good, easy replacement for my Craftsman mower...." Read more

Fit perfect
5 out of 5 stars
Fit perfect
I purchased this for our yard machine lawn mower. It fit perfect. Old one off, new one on. No fighting with it. Would recommend;)
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Top reviews from Canada

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  • GabrielU
    5.0 out of 5 stars Replacement for my Honda GCV 160 model
    Reviewed in Canada on June 14, 2025
    Verified Purchase
    I got this to replace my old Honda GCV 160 blade which got bended when after I ran the lawn mower over some big wood scraps.

    The blade came well packaged, together with a bag of adjustment rings.
    There were no instructions in the box, but I figured out to place the ring that fitted the best / closest to the screw diameter size then placed had the outside - bigger one holding the ring and blade together with my original washer. Works pretty well. I wish there were some instructions in the box.
    Helpful
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  • Serenity Now
    5.0 out of 5 stars Excellent Lawn Mower replacement Blade
    Reviewed in Canada on May 25, 2025
    Verified Purchase
    Much more than expected at this unbelievable price, Easy to install perfect fit. Excellent balanced no vibrations as extremely sharp.
    Helpful
     Report
  • Regis Tremblay
    4.0 out of 5 stars coupe le gazon :)
    Reviewed in Canada on June 17, 2025
    Verified Purchase
    Juste s'assurer que la lame est bien siégée.
    Helpful
     Report
  • CF
    5.0 out of 5 stars Does what it should.
    Reviewed in Canada on June 29, 2024
    Verified Purchase
    Blade was relatively simple to install. It’s critical that you follow the instructions and ensure you select the correct size spacer to get a tight connection. Getting clean cuts with this blade and it is performing as hoped.
    Helpful
     Report
  • Mike
    5.0 out of 5 stars Cheap blade, gets the job done
    Reviewed in Canada on July 18, 2024
    Verified Purchase
    It’s getting the lawn cut. I will probably give it a sharpening at some point because I’m fussy and have also been pretty rough on it. Been using for 2 months now.
    Helpful
     Report
  • Carrie
    5.0 out of 5 stars Fit perfect
    Reviewed in Canada on June 5, 2024
    Verified Purchase
    I purchased this for our yard machine lawn mower. It fit perfect. Old one off, new one on. No fighting with it. Would recommend;)
    Customer image
    Carrie
    5.0 out of 5 stars
    Fit perfect

    Reviewed in Canada on June 5, 2024
    I purchased this for our yard machine lawn mower. It fit perfect. Old one off, new one on. No fighting with it. Would recommend;)
    Images in this review
    Customer image
    Helpful
     Report
  • K. Hant
    5.0 out of 5 stars It works
    Reviewed in Canada on July 16, 2024
    Verified Purchase
    Works and fits as promised.
    Helpful
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  • Jason
    1.0 out of 5 stars Product sent with reducing washers missing
    Reviewed in Canada on June 19, 2025
    Verified Purchase
    Shipped to me missing the set of reducing washers (making the blade useless to me unless I go find/buy them separately). Super annoying. Won’t buy Max Power products again if I can’t trust parts won’t be missing.
    Helpful
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Top reviews from other countries

  • phase
    5.0 out of 5 stars Fit perfectly.
    Reviewed in the United States on June 23, 2025
    Verified Purchase
    The adapters solved my problem. I have an old mower and could not find a blade that fit, This was the perfect way to mount the blade to my mower. Now my 20 year old mower cuts like new.
    Report
  • Allison K.
    5.0 out of 5 stars Lawn mower blade
    Reviewed in the United States on February 6, 2025
    Verified Purchase
    Fit was perfect. Cuts great and quality is great! Will purchase again when needed!
    Report
  • Pavel
    5.0 out of 5 stars Best lawn purchase ever
    Reviewed in the United States on October 21, 2023
    Verified Purchase
    I have a small160cc honda push mower and it's a night and day difference compared to the OEM blade. Mulches overgrown grass like it's nothing, has not jammed on me once mowing 5 overgrown lawns so far. Cuts low with ease and obliterates groundhog mounds like it's nothing. Sharpen this once a season and you're set for a long time.
    Report
  • FinestHops
    1.0 out of 5 stars Soft metal
    Reviewed in the United States on June 13, 2024
    Verified Purchase
    The metal for the blade is VERY soft. That means a very cheap steel was used. Hit a small rock that would cause a little dent normally but the amount of damage on the blade is BAD.

    Next, I am not a fan on the type of universal mounting system this uses. Shove a washer in the bit hole and then screw a larger plate over it. No lock washer which is something you should generally replace when replacing a blade so had to go get one of those elsewhere. Last time I got a universal at home depot it even came with one. Not the end of the world but the quality of the metal means I will not be buying the brand again.
    Report
  • Gadams
    4.0 out of 5 stars Good blade
    Reviewed in the United States on October 7, 2024
    Verified Purchase
    The blade is nice but I wish I would of found this blade before I changed my engine because this blade has a huge drop on the ends. It must drop at least 3/4".
    Report