Best 21-Inch Greenworks Lawn Mower Blades: Top 5 Picks (November 2026)
The best 21-inch Greenworks lawn mower blades include the SummerCool 21" Mower Blade Compatible with Greenworks for listed Greenworks models, the DAOLONG 21 Inch Mower Blade for keeping a spare, and the Oregon 21 Inch Lawn Mower Blade for 5/8-inch center holes.
On this page (6 sections)
- Which Greenworks lawn mower blades 21 inch picks fit best?
- How we compared these 21-inch Greenworks mower blades
- What should you check before buying a Greenworks blade?
- How do you install a 21-inch Greenworks mower blade?
- How can you care for a replacement Greenworks blade?
- Which Greenworks blade should you choose?
The best Greenworks lawn mower blades 21 inch pick is the SummerCool replacement blade for the Greenworks and Kobalt models named in its compatibility details. DAOLONG is the better fit for a 2-pack, while the Oregon options are mainly pattern-specific choices for other 21-inch mower decks.
That short answer only works when the model and mounting details line up. A blade can be the right length for the deck and still be wrong for the mower that sits under it.
A 21-inch label alone doesn't prove that a replacement blade will fit. The center hole, outer holes, spacing, blade width and mounting hardware must also match your mower.
Think of the label as a starting point, not the final check. The hardware tells you whether the blade will sit flat, align with the fixing holes and tighten without force.
This guide is for owners who need a direct replacement for a named Greenworks model. It also helps if you are comparing a single blade with a 2-pack for newer maintenance jobs.
SummerCool suits named Greenworks and Kobalt models with matching measurements. DAOLONG suits the same named group when a spare blade is useful to keep on hand.
The Oregon blades suit different 21-inch decks only when their center-hole patterns match. Their length alone does not make them Greenworks replacements.
For a wider comparison of this size, see our guide to best lawn mower blades 21 inch.
If your mower is a Craftsman, compare these picks with the best 21-inch Craftsman lawn mower blades.
Use the model number from your mower before you compare prices or pack counts. That step saves the most time and avoids a return.
Also compare the old blade after cleaning off grass and dirt. Measure the length, width, thickness and center hole while the blade is flat.
If a measurement looks close but not exact, pause and check the manual. A small difference in the mounting area can matter more than a small difference in total length.
Once the model and hardware match, pack count becomes a practical choice. A single blade suits a one-time swap, while a second blade helps with later service.
Care also matters after the first mow with a new blade. Inspect the edge, remove packed debris and check the fixing hardware during normal upkeep.
That approach keeps the choice simple. Match the mower first, then choose the blade shape, material and pack size that fit how you mow.
Our picks at a glance
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Best for listed Greenworks modelsSummerCool 21" Mower Blade Compatible with Greenworks
9.7/10 our score
See it on Amazon -
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Check itOregon 21 Inch Lawn Mower Blade
Best for bow-tie center holes - 5
Check itDichallu 21 inch Mower Blade Replace
Best for a 40 manganese steel option
Which Greenworks lawn mower blades 21 inch picks fit best?
SummerCool is the strongest model-specific choice here, followed by DAOLONG and Dichallu for shoppers who need the same general Greenworks replacement measurements. The Oregon blades serve different mounting patterns, so their 21-inch length does not make them automatic Greenworks replacements.
SummerCool 21" Mower Blade Compatible with Greenworks: Best for listed Greenworks models
- 20.08 in length
- 0.708 in center hole
- Pre-sharpened cutting edge
- Compatible with listed 21-inch Greenworks and Kobalt models
SummerCool is the strongest match for the Greenworks and Kobalt models named in its title and compatibility details. Its pre-sharpened edge and round standard center hole keep the choice simple when those measurements match your mower.
Pros
- Pre-sharpened cutting edge
- Named Greenworks model compatibility
- Round standard center hole
Cons
- Single blade
- Fit still needs to be checked against the mower
SummerCool is the top pick because it names several Greenworks 21-inch mower models, including C3208101, MO40L4413, MO40L03 and MO48L4422. It also names Greenworks 80V, 60V, 40V and 2 x 24V mower groups, plus Kobalt models.
For collecting clippings from a compatible Greenworks mower, see replacement bags for Greenworks mowers.
The blade measures 20.08 inches long, 1.97 inches wide and 0.126 inches thick. Its center hole measures 0.708 inch, so compare that measurement with the old blade and the mower's mounting hardware before ordering.
A pre-sharpened cutting edge reduces the setup work associated with installing a replacement. When it needs upkeep, compare angle-grinder mower blade sharpeners.
SummerCool also describes the blade as powder-coated, with the coating expected to wear during use.
The round standard center-hole mounting system is the key installation detail. Shut off the mower, remove the old blade with suitable tools, align the replacement with the fixing hole and tighten the fixing nut firmly.
Choose SummerCool when your exact Greenworks model and hole dimensions match. After sharpening, a magnetic mower blade balancer can help check that the blade sits level.
Its main trade-off is that this is a single blade, so you don't get a spare in the same package.
DAOLONG 21 Inch Mower Blade: Best for keeping a spare
- 2-pack
- 21 in cutting width
- High hardness quenched steel
- Compatible with listed Greenworks models
DAOLONG gives you two 21-inch replacement blades for the Greenworks models named in its details. It suits homeowners who want a second blade ready for the next replacement.
Pros
- 2-pack
- Named Greenworks model compatibility
- 21-inch cutting width
Cons
- Fit must be checked before installation
- No single-blade option in this product
DAOLONG is the best choice here if you want 2 replacement blades for future maintenance. Its compatibility details name Greenworks C3208101, MO40L4413, MO40L03 and MO48L4422.
Each blade has a 21-inch cutting width. The blades are made from metal and described as high-hardness quenched steel, with a design intended for regular mowing, wet grass, thick weeds and fast-growing lawns.
The 2-pack changes the maintenance routine. You can install one blade and keep the second one ready, or replace both at separate service points without placing another order immediately.
DAOLONG also describes an arc structure intended to reduce wet grass and debris sticking to the blade. Treat that as a design feature, not a guarantee that the deck will never need cleaning.
Pick this option when the named Greenworks model matches and having a spare matters. Before installation, compare the blade's mounting details with your mower because the 21-inch width alone is not enough.
Oregon 21 Inch Lawn Mower Blade: Best for 5/8-inch center holes
- 5/8 in center hole
- 3/8 in outer holes
- 2.25 in width
- Mulching design
This Oregon blade is a fit-focused option for 21-inch decks that use its 5/8-inch center hole, 3/8-inch outer holes and 1-7/8-inch center-to-center spacing. Its mulching design suits mowing where clippings are recut.
Pros
- Detailed mounting measurements
- Mulching design
- Durable steel construction
Cons
- Not a listed Greenworks-specific replacement
- Hole pattern must match exactly
This Oregon blade is a fit-specific choice for a 21-inch deck with a 5/8-inch center hole, 3/8-inch outer holes and 1-7/8-inch center-to-center spacing. It measures 21 inches long, 2.25 inches wide and 0.134 inch thick.
The title and compatibility details focus on Craftsman, AYP, Husqvarna and other mower models rather than Greenworks. For another walk-behind brand, compare Lawn-Boy mower blades.
That makes it a poor choice for a Greenworks mower unless your manual and old blade confirm the same mounting pattern.
Its mulching design is the main mowing advantage. The blade is designed to finely cut and recut grass clippings, which can reduce the amount of material left in larger pieces when the mower and mowing conditions support mulching.
The detailed hole measurements make this a useful replacement when you are matching a blade by hardware rather than by brand name. Measure the old blade and check the mower manual before ordering.
Choose Oregon B0GL4JB8VS for a compatible 5/8-inch center-hole pattern. Don't choose it simply because your mower deck is labeled 21 inches.
Oregon 21 Inch Lawn Mower Blade: Best for bow-tie center holes
- Bow-tie center hole
- 5/16 in outer holes
- 2-1/2 in center-to-center distance
- Mulching design
This Oregon blade is for a different mounting pattern, with a bow-tie center hole and 5/16-inch outer holes. It is useful only when those details match your mower, including the listed Cub Cadet, MTD, Troy-Bilt and Craftsman models.
Pros
- Clear bow-tie mounting pattern
- Mulching design
- Alloy steel construction
Cons
- Not a listed Greenworks-specific replacement
- Single blade
This Oregon blade uses a different mounting system from the previous Oregon pick. It has a bow-tie center hole, 5/16-inch outer holes and 2-1/2-inch center-to-center spacing.
The blade is 21 inches long and 2.25 inches wide. It is made from alloy steel and has a mulching design for cutting and recutting clippings.
Its listed model groups include Cub Cadet, MTD, Troy-Bilt, Craftsman and Yard Machines mowers. For John Deere mower fit details, see John Deere lawn mower blades.
Greenworks is not among those named model groups, so confirm the exact pattern before considering it for a Greenworks deck.
This is a one-blade package. That suits a direct replacement when you need one blade, but it offers less spare capacity than the DAOLONG 2-pack.
Pick this Oregon blade only when your mower uses the bow-tie center-hole pattern and the stated outer-hole spacing. A matching blade length cannot compensate for a different center shape.
Dichallu 21 inch Mower Blade Replace: Best for a 40 manganese steel option
- 40 manganese steel
- 20.08 in length
- 0.708 in center hole
- Compatible with listed Greenworks models
Dichallu matches the same key dimensions shown for several Greenworks replacements, including a 20.08-inch length and 0.708-inch center hole. It is a single-blade choice with 40 manganese steel construction.
Pros
- 40 manganese steel
- Named Greenworks model compatibility
- Single replacement blade
Cons
- One blade per pack
- Fit must be confirmed before ordering
Dichallu is a single-blade Greenworks replacement with the same key dimensions shown for several compatible models. It measures 20.08 inches long, 1.97 inches wide and 0.126 inch thick, with a 0.708-inch center hole.
Its compatibility details name Greenworks MO40L4413, MO40L03, MO48L4422 and C3208101. They also list Greenworks 80V, 60V, 40V and 2 x 24V mower model groups.
The blade uses 40 manganese steel. That material is described as offering toughness, wear resistance and longer sharpness, but those claims don't remove the need to inspect the blade during normal mower care.
Dichallu includes 1 blade. It is a practical choice when you need one replacement and don't want a 2-pack.
Check the center hole against the old blade before installation. The 0.708-inch measurement is the detail that makes or breaks the fit for these named models.
Choose it when the listed mower model and mounting dimensions match. SummerCool ranks higher here because it adds a pre-sharpened edge and clearer round-hole installation details, while Dichallu remains a reasonable single-blade alternative.
How we compared these 21-inch Greenworks mower blades
We compared model compatibility, blade dimensions, center-hole details, outer-hole patterns, material, pack count and mowing purpose. A blade received a higher score when its data gave a clearer match for the Greenworks search intent.
Our score weighs specs, features and buyer feedback against what you're shopping for. The score is not a guarantee that a blade fits every mower carrying a 21-inch deck label.
The two Greenworks-focused dimensions in this group are 20.08 inches long, 1.97 inches wide and 0.708 inch for the center hole. SummerCool and Dichallu both show those measurements, while DAOLONG names the same Greenworks model group but gives a 21-inch cutting width.
The Oregon blades are more useful as examples of why model matching matters. One uses a 5/8-inch center hole and 3/8-inch outer holes.
The other uses a bow-tie center hole and 5/16-inch outer holes.
| Product | Best for | Length | Width | Center hole | Our score |
|---|---|---|---|---|---|
| SummerCool 21" Mower Blade Compatible with Greenworks | listed Greenworks models | 20.08 in | 1.97 in | 0.708 in | 9.7 |
| DAOLONG 21 Inch Mower Blade | keeping a spare | 9.5 | |||
| Oregon 21 Inch Lawn Mower Blade | 5/8-inch center holes | 5/8 in | 9.1 | ||
| Oregon 21 Inch Lawn Mower Blade | bow-tie center holes | Bow-tie | 9.0 | ||
| Dichallu 21 inch Mower Blade Replace | a 40 manganese steel option | 20.08 in | 1.97 in | 8.9 |
What should you check before buying a Greenworks blade?
Check the mower model number first, then compare the old blade's length, width, thickness, center hole, outer holes and hole spacing. These details matter more than a general 21-inch label.
Match the Greenworks mower model
Greenworks has mower groups with different model numbers and electrical systems. SummerCool and Dichallu name several Greenworks models, while DAOLONG lists C3208101, MO40L4413, MO40L03 and MO48L4422.
Write down the complete model number from the mower before you shop. If the model number is missing or hard to read, use the mower manual and the old blade as your references.
Don't assume that a blade for one 21-inch Greenworks mower fits every other 21-inch mower. A similar deck width can still use different mounting hardware.
Compare the center hole and mounting holes
The center hole keeps the blade aligned with the mower's mounting system. A round 0.708-inch hole is not interchangeable with a 5/8-inch hole or a bow-tie opening simply because all three blades are used on 21-inch decks.
Check the outer holes and spacing too. The Oregon B0GL4JB8VS uses 3/8-inch outer holes with 1-7/8-inch center-to-center spacing.
The Oregon B0D7XYXKMM uses 5/16-inch outer holes with 2-1/2-inch spacing.
If the holes don't match, don't drill, enlarge or modify the blade. Choose a blade designed for the mower's hardware.
Check the blade width and thickness
Blade length affects the cutting span, but width and thickness also affect how the replacement sits in the deck. SummerCool and Dichallu show a 1.97-inch width and 0.126-inch thickness.
The Oregon options show 2.25-inch width.
Use the mower manual when available. If you are comparing the old blade, measure it after removing it and cleaning away packed grass and dirt.
A replacement that looks close can still be wrong if the mounting area or blade profile doesn't match. When measurements disagree, pause and confirm the model before buying.
How do you install a 21-inch Greenworks mower blade?
Install the replacement with the mower powered down, the old blade removed and the new blade aligned with the mounting holes. Tighten the fixing hardware firmly and follow the mower manual's safety steps for your exact model.
For a full walkthrough, read How to Change Lawn Mower Blades?. The exact shutdown process differs between electric and gas-powered mowers, so use the procedure that applies to your machine.
Before touching the blade, disconnect the power source according to the mower instructions. Wear protective gloves when handling the cutting edge, and support the mower safely if it must be tilted.
Remove the old blade with the correct tool and note its position before taking it off. Clean grass from the mounting area so the replacement sits flat.
Align the new blade with the center hole and any outer holes. Do not force a blade into place or make changes to the holes.
If the hardware does not line up, stop and recheck the model and measurements.
After tightening, inspect the blade area before reconnecting power. Keep bystanders away during the first start and stop immediately if the mower vibrates unusually.
How can you care for a replacement Greenworks blade?
Inspect the blade for bends, cracks, deep nicks and packed grass after mowing. Clean away debris, keep the blade dry during storage and replace it when damage or wear makes sharpening unsuitable.
A sharp blade makes a cleaner cut than a heavily worn one. For maintenance timing and edge care, see How Often Should You Sharpen Lawn Mower Blades?.
Avoid mowing through hard objects whenever possible. Contact with stones, roots or other debris can damage the cutting edge and may bend the blade.
Check for vibration after installation. Vibration can point to loose hardware, an unbalanced blade, damage or an incorrect fit, so stop the mower and inspect it before continuing.
The product data for SummerCool describes a pre-sharpened edge, but every replacement blade still needs normal inspection. A pre-sharpened blade doesn't remove the need to check the mounting hardware and cutting edge.
Which Greenworks blade should you choose?
Choose SummerCool when your mower is one of the named Greenworks or Kobalt models and the 20.08-inch blade, 1.97-inch width and 0.708-inch center hole match. Pick DAOLONG when you want 2 compatible blades for ongoing maintenance.
Start with the complete mower model number. That number narrows the field faster than deck size or brand alone.
Then measure the old blade. Compare length, width, thickness, center hole, outer holes and spacing before you place an order.
Choose SummerCool for a pre-sharpened edge and clear round-hole installation details. Its listed models include C3208101, MO40L4413, MO40L03 and MO48L4422.
Choose DAOLONG when a spare blade fits your routine. The 2-pack suits owners who want one blade installed and one ready for a later swap.
Choose Dichallu for a single-blade option with the same key dimensions and 40 manganese steel construction. It fits the same named Greenworks group when the 0.708-inch center hole matches.
Consider the Oregon blades only when your mower uses their exact mounting patterns and listed model families. One uses a 5/8-inch center hole, and the other uses a bow-tie center hole.
Do not treat either Oregon pattern as a default Greenworks fit. A different center-hole shape will not be fixed by a similar blade length.
For a direct Greenworks swap, SummerCool and Dichallu are easier to check because they share the 20.08-inch length and 1.97-inch width. DAOLONG is the easier choice when pack count matters more than a single blade.
After installation, inspect the blade after the first mow. Remove packed grass, check the fixing hardware and watch for unusual vibration.
Store any spare blade dry and protected from damage. That keeps the edge ready and makes the next replacement faster to plan.
Before ordering the best greenworks lawn mower blades 21 inch option, match the complete mower model and mounting hardware. Then use How Is Greenworks Lawn Mower? if you want broader brand and mower information before planning your next maintenance job.
If the model number is worn off, use the manual and old blade as your guide. Do not rely on a general 21-inch label when the mounting details are unclear.
Our top 3 picks at a glance
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Best for listed Greenworks models
SummerCool 21" Mower Blade Compatible with Greenworks
9.7/10 our score
See it on Amazon -
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3
Frequently asked questions
What is the best Greenworks lawn mower blade 21 inch option?
The SummerCool 21-inch replacement blade is the best overall match in this group because its compatibility details name several Greenworks and Kobalt 21-inch mower models, along with a 20.08-inch length and 0.708-inch center hole.
Confirm your mower model and mounting hardware before ordering.
Are all 21-inch Greenworks mower blades interchangeable?
No. A 21-inch cutting width does not guarantee a safe fit.
Center-hole shape, outer holes, spacing, blade width and thickness can differ between mower models.
Match the replacement blade to your mower manual and old blade before installation.
What size blade fits a 21-inch Greenworks mower?
The correct blade depends on the mower model, not only the deck label. The SummerCool and Dichallu options list a 20.08-inch blade, 1.97-inch width and 0.708-inch center hole for named Greenworks models.
Use your model number and mounting measurements to confirm the match.
Is a 2-pack of Greenworks mower blades useful?
A 2-pack can be useful if you want one blade installed and another ready for a later replacement. DAOLONG includes 2 blades and lists compatibility with several Greenworks 21-inch mower models.
Store the spare dry and protected from damage until you need it.
How often should a Greenworks mower blade be replaced?
Replace a blade when it has deep nicks, bends, cracks or excessive wear, or when sharpening no longer restores a clean edge. The mowing schedule, grass conditions and contact with hard objects affect wear.
Inspect the blade after mowing and follow the mower manual for service guidance.
