Fit first, brand second. Nearly every bad blade purchase we have seen traced back to a blade that was one inch too long, one hole pattern off, or a shade too heavy for a small-displacement engine.
So here is the short version of the best replacement mower blades for 2026. Measure your old blade tip to tip, check the center hole pattern, and confirm the OEM part number before you pick a brand. Once fit is confirmed, Oregon Gator style serrated mulching blades lead for cut quality, MaxPower blades dominate the 21-inch and 22-inch deck market with the deepest review counts in the category, and genuine OEM blades like the Honda set win on exact fit and balance.
We spent weeks comparing ten blades across walk-behind, cordless, and 48-inch riding mower decks, weighing cut quality, edge retention, balance, and how honestly each listing described its fitment. Below you will find the ten best replacement mower blades available now, plus the measurement steps that decide whether any of them will actually bolt onto your deck.
If you are shopping for a whole new machine rather than a part, our lawn mower and trimmer combo kit guide covers the deck sizes people typically end up owning.
Top 3 Replacement Mower Blades (October 2026)
MaxPower 21 in Mulching Blade
- Replaces 11 MTD
- Cub Cadet and Troy-Bilt part numbers
- Factory sharpened and powder coated
- Bow tie center hole for 21 inch decks
UDC 21 in Blade 2-Pack
- Two blades so a spare is always on hand
- Pre-sharpened high-strength steel
- Long OEM compatibility list
UDC 48 in Blade 3-Pack
- Fits 48 inch riding and zero-turn decks
- 5 point star center hole
- Three blades per pack
The Best Replacement Mower Blades in 2026 at a Glance
All ten blades below are listed with the fitment detail that actually decides the purchase. Deck size, blade length tip to tip, and center hole pattern matter more than any brand name.
| Product | Specifications | Action |
|---|---|---|
| MaxPower 21 in Mulching Blade |
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Check Latest Price |
 EGO 21 in 3-in-1 Blade AB2100 |
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 MaxPower Toro 22 in Mulching Blade |
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| UDC 21 in Blade 2-Pack |
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| UDC 48 in Blade 3-Pack |
|
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 Honda OEM Mulching Blade Set |
|
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 Greenworks 20 in Twin Blade Set |
|
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 Greenworks 16 in Corded Blade |
|
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 GICOOL 21 in 3-in-1 Blade |
|
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 EGO Select Cut Blade 2-Pack |
|
Check Latest Price |
1. MaxPower 331528B USA Made 21 in Mulching Blade
Maxpower 331528B USA MADE 21″ Cut Mulching Blade
21 in deck fit
Bow tie center hole, 5/16 in outside hole
1.6 lb, factory sharpened
Pros
- Replaces 11 MTD
- Cub Cadet
- Troy-Bilt and Craftsman OEM numbers
- Factory sharpened and powder coated for corrosion protection
- Deepest review history in the category
- Direct fit with no modification
Cons
- You must match the OEM number before ordering
- Powder coating wears off during the first cut
- 21 inch decks only
This is the blade we keep coming back to for a reason. It holds a 4.7 average across more than 11,000 ratings, which is far more real-world data than any other blade on this list, and the review pattern is consistent: buyers find the fit exact and the factory edge sharp enough to cut well right out of the box.
It covers a genuinely wide swath of 21-inch decks. The listed OEM numbers include 742-0741, 942-0641, 742-04276 and several variations, spanning Cub Cadet CC, SC and S/SR series, MTD 214 IP and 214 KW, PR 521, and Troy-Bilt TB 105 through TB 490 XP along with Tru-Cut, Tuff Cut and Pro-Cut models.
The center hole is a bow tie pattern with a 5/16 inch outside hole diameter and 2.5 inch center-to-center spacing. That specification is the single most useful line on the listing, because it tells you immediately whether the blade will reach your spindle.
One detail worth knowing: the blade ships sharpened and powder coated, and that coating comes off during the first cut. Owners who evaluate the edge before mowing sometimes think they received a dull blade. They did not. The coating simply comes away on the first pass through grass.
Forum owners on r/lawnmowers make a related point that applies here. When you inherit a used mower, blade balance matters as much as blade type, and a fresh direct-fit blade on a spindle that has been running a bent blade for years can expose an underlying vibration problem. Replace one blade at a time on multi-blade decks so the new blade can be balanced against the old one.
Who this blade suits
This suits anyone with an MTD, Cub Cadet, Troy-Bilt or Craftsman 21-inch walk-behind whose old blade number appears in the compatibility list. It is also the safest default recommendation for a homeowner who wants one part number that solves most 21-inch deck problems.
It is the blade we would pick for a mixed fleet of walk-behinds across a landscaping crew, because the same part number covers so many machines and the edge is resharpenable when it eventually dulls.
Where it falls short
It is a 21-inch blade, so it does nothing for a 22-inch Toro Recycler deck or a 48-inch tractor. The compatibility list is long but it is not universal, and a blade that is one inch too long for the deck will not clear the deck walls.
It is also a mulching profile, not a dedicated high lift. If your priority is filling the bag on thick, wet grass, the high lift wing on the GICOOL blade below is a better match.
2. EGO POWER+ 21 in Blade AB2100 for LM2100 Series
EGO POWER+ 21″ Blade for Electric Lawn Mowers LM2101/LM2100/LM2102SP/LM2100SP/LM2142SP – AB2100
3-in-1 mulching, bagging and side discharge
Factory sharpened steel
16 oz, 21 in cutting width
Pros
- Highest rated blade on the list at 4.8 stars
- Factory sharpened edge owners call the sharpest they have owned
- Simple direct fit on listed LM2100 series decks
- Restores mower performance noticeably
Cons
- Fits only the listed LM2100 series mowers
- Some blades arrive with light surface rust at the ends
- No 22 inch or riding mower coverage
Cordless decks fail differently from gas decks. The blade is the same physics but the motor is not, so weight and balance matter more when there is no torque to spare. This EGO blade is 16 ounces, which is featherweight next to the steel walk-behind blades in this roundup.
It is a 3-in-1 design that mulches, bags, and side discharges, which makes it the flexible choice for a battery mower owner who switches modes through the season. Adjustable cutting height runs from 3.5 inches, and the factory sharpened steel edge is consistently described as a sharp step up from a worn blade.
The most repeated caveat in the reviews is cosmetic. Some blades arrive with a light film of surface rust at the ends, which points to wrapping that was not fully sealed in transit. Owners generally clean it off or fit the blade anyway, and it does not affect cut quality once the edge is past the first pass.
Fit is model specific. The blade is built for the LM2100, LM2101, LM2100SP and LM2102SP decks, so check the model number printed on the mower body before you order. It will not reach a 22-inch deck even though both are 21-inch class machines.
Who this blade suits
This suits EGO POWER+ 21-inch cordless mower owners who want to restore factory cut performance and are unwilling to pay dealer pricing for the same part. It is also a good pick for anyone whose cordless mower has started bogging grass down, since a sharp, light blade is the cheapest fix for that symptom.
Readers shopping battery platforms more broadly can also compare electric mower deals before deciding which platform to standardize on.
Where it falls short
It is not universal within the EGO range. Mowers using the Select Cut multi-blade system need a different part, which is item ten on this list.
The fitment is narrow enough that ordering the wrong part number is the most likely reason for a return here. Measure the blade and check the mower model first.
3. MaxPower 331376XB USA Made Mulching Blade for 22 in Toro Decks
MaxPower 331376XB USA MADE Commercial Mulching Mower Blade
21-11/16 in long by 2-1/4 in wide
7/16 in center hole
1.96 lb, factory sharpened
Pros
- Exact OEM spec replacement for common Toro Recycler decks
- Replaces three common Toro OEM numbers
- Manufactured to meet or exceed OEM specifications
- 4.6 stars across more than 4600 ratings
Cons
- Narrow fitment limited to Toro Recycler decks
- Confirm the 7/16 in center hole before ordering
- Powder coating must wear off to reach full sharpness
Toro Recycler decks are the most common 22-inch walk-behind platform in circulation, and this blade is dimensionally exact for them. It measures 21-11/16 inches long by 2-1/4 inches wide, which is why it lands without the clearance problems that generic 22-inch blades cause.
It replaces Toro OEM numbers 104-8697-03, 108-9764-04 and 131-4547-03. Those three numbers cover a large share of older Recycler models, and the blade is manufactured to meet or exceed the OEM specification rather than merely approximate it.
The 7/16 inch center hole is narrower than the bow tie pattern used on 21-inch MTD decks, and that difference is the whole ballgame. A blade that bolts onto a 21-inch deck will not reach the spindle here, which is why a bolt size mismatch shows up as the top complaint in fitment questions for this part.
Like the MaxPower 21-inch blade, it arrives factory sharpened and powder coated, with the coating wearing away during the first cut. At 1.96 pounds it sits at the heavier end of the walk-behind range, which is a factor on smaller engines.
That weight point comes up repeatedly in owner discussions. r/lawncare regulars warn that oversize aftermarket blades bog down small-displacement walk-behind engines and contribute to overheating. A blade built to OEM specification for your deck is almost always the right weight for the engine bolted to it.
Who this blade suits
This suits owners of a 22-inch Toro Recycler who want the OEM footprint without a dealer trip. It is also a strong pick for anyone with several matching Toro decks who wants a part that meets spec rather than one that merely fits.
Owners who have run a serrated Oregon Gator mulching blade on a Toro deck report much better leaf handling, so this blade is the conservative choice rather than the most capable mulching choice.
Where it falls short
It covers one deck family. If your 22-inch mower is a Honda, Craftsman or EGO platform, this part will not fit regardless of deck size, because the center hole and mounting hardware differ.
It is also a mulching profile with no high lift wing, so bagging performance on very thick grass will underperform a dedicated high lift blade.
4. UDC Parts 942-0741A Troy-Bilt 21 in Blade 2-Pack
UDC Parts 942-0741A Troy Bilt 21 inch Lawn Mower Blade Replacement, 2 Pack
21 in long by 2-1/4 in wide
Bow tie center hole, 5/16 in side hole
3.21 lb for the two-blade pack
Pros
- Two blades so a spare is always on hand
- Covers a long list of Troy-Bilt
- Craftsman
- Cub Cadet and MTD numbers
- Pre-sharpened high-strength steel that can be resharpened
- Direct fit with no modification
Cons
- One-star reviews run slightly higher than most rivals at about 6 percent
- Still requires matching the OEM number and bow tie hole pattern
- 21 inch decks only
The two-pack is the reason this blade makes the list. Blades dull on a schedule you cannot predict, and having a second identical blade on the shelf turns a mid-season trip into a five-minute swap instead of a project.
It measures 21 inches long by 2-1/4 inches wide with an air lift of 1-7/64 inches and a cutting edge length of 6-7/64 inches. Those dimensions line up with the 21-inch MTD family rather than exceeding them, so clearance inside the deck is not a concern.
The compatibility list is long. It covers Troy-Bilt 942-0741A, 742-0741, 942-04100, 942-04276 and a string of related numbers, plus MTD 490-100-C089, 490-100-M084 and 490-100-F084, Cub Cadet CC-742-0741, and Craftsman CMXGZAM100067. Model coverage runs from Troy-Bilt TB100 through TB490XP and on to Craftsman M140, M220, M230, M250 and M320.
At 4.5 stars with about 6 percent one-star ratings, this pack has a slightly rougher fitment record than the MaxPower blades, and the negative reviews cluster almost entirely around ordering a model number that is not on the list. The pre-sharpened high-strength steel is resharpenable, which extends the useful life well past the first season.
Who this blade suits
This suits a 21-inch MTD-family owner who mows often enough to consume a blade every season and wants a spare. It is also the pick for anyone maintaining more than one 21-inch walk-behind on the same deck pattern.
One year of product support is included for manufacturing defects, which matters more than it sounds on a consumable part that lives in wet grass.
Where it falls short
The pack is heavy at 3.21 pounds because it contains two blades. On a small engine mower that is fine to carry but worth remembering if your deck was designed around a lighter factory blade.
It will not fit star-pattern hubs. If your spindle takes a 5-point star, this bow tie pattern blade is the wrong part no matter how close the deck size looks.
5. UDC Parts 532180054 Husqvarna 48 in Blade 3-Pack
UDC Parts 532180054 Husqvarna 48 Inch Lawn Mower Blades Replacement, 3 Pack
16-3/4 in long by 2-1/2 in wide
5 point star center hole
4.8 lb for the three-blade pack
Pros
- Three-blade pack suits the 48 inch decks that use them
- Covers a large list of Husqvarna
- Craftsman and Poulan numbers
- Pre-sharpened high-strength steel with a resharpenable edge
- Direct fit that installs without modification
Cons
- Only suited to 48 inch decks with a 5 point star center hole
- About 6 percent of reviews are 1-star
- mostly fitment on unlisted models
This is the pick if you own a 48-inch tractor or zero-turn rather than a walk-behind. A 48-inch deck runs two or three blades depending on the platform, and buying them singly means three separate orders and three chances to order the wrong part number.
Each blade measures 16-3/4 inches long by 2-1/2 inches wide with an air lift of 1-7/32 inches and a 5-43/64 inch cutting edge. Note that a 48-inch deck uses much shorter blades than its deck width suggests, which surprises people measuring for the first time.
The 5-point star center hole is the distinguishing feature. It replaces Husqvarna 532180054, 180054, 532173920, 173920, 539107519, 575938201 and 588811002, plus Craftsman CMXGZAM110149. Coverage includes Husqvarna YTH and GTH 48-inch tractor series, zero-turn models, Craftsman 917-series 48-inch tractors, and Poulan PB20VA48, PB23H48LGT and PP22V48.
That multi-blade setup is exactly where balance discipline pays off. A tractor with two or three unmatched blades will vibrate, and vibration works through the spindle bearings and then the engine mounts. Owners on r/JohnDeereLawnMachines describe running matched sets specifically because the cut quality and the machine comfort both improve when the blades are balanced as a group.
Who this blade suits
This suits Husqvarna, Craftsman and Poulan 48-inch tractor and zero-turn owners, and especially anyone who wants a matched set of three so the whole deck can be replaced in one order.
If you are also replacing tires, blades, or a deck on the same machine this season, our box blade and driveway blade guide covers the tractor-side hardware separately.
Where it falls short
It is a 48-inch deck part. The identical-looking blade on a 42-inch deck is a different length, and forcing this one on a shorter deck is a clearance and safety problem rather than a fitment inconvenience.
The pack weighs 4.8 pounds, so it is a real load for a single person handling an off-deck blade change. Plan for a second set of hands on a tractor.
6. Honda 08720-VH7-000 OEM Mulching Blade Set
Honda 08720-VH7-000 Mulching Blade Set
Genuine Honda twin MicroCut set
Alloy steel construction
Cutting width 21 in equivalent
Pros
- Genuine OEM fitment on compatible HRX models
- Finer mulching and cleaner cut than worn aftermarket blades
- Well-balanced alloy steel that outlasts knock-off sets
- 4.8 stars with 86 percent five-star ratings
Cons
- Costs more than generic aftermarket blades
- Arrives factory sharp rather than razor sharp
- Compatibility keys on mower model rather than engine model
Honda blades sit at 4.8 stars with 86 percent five-star ratings, the highest five-star share of anything we reviewed, and the reason is fitment certainty. If the model matches, it bolts on and nothing needs adjusting.
This is a twin MicroCut set, part numbers 72531-VH7-000 and 72511-VH7-000, in alloy steel. The twin-blade geometry is what separates Honda’s mulching from a generic flat blade: the second blade recirculates clippings back through the deck so they are cut repeatedly before returning to the lawn.
Owners consistently report an immediate improvement in clipping size over worn blades, and several note that the original heat-treated bolts and washers are reused on install so the hardware matches. A torque wrench matters here. Owner reports put the spec at roughly 40 ft-lbs, and a loose spindle bolt on a set of blades that size is a real hazard.
Two caveats come up repeatedly. The cost is higher than generic aftermarket blades, and the factory edge arrives sharp but not razor sharp, so some owners touch it up before the first cut. Compatibility must be confirmed by mower model, not engine model, because Honda reuses engines across platforms.
Who this blade suits
This suits Honda HRX owners who want the exact mulching geometry the machine was designed around. It is the choice for a mulching setup where fine clipping size genuinely matters for lawn health.
It also suits anyone who has already tried a generic blade on an HRX and been disappointed by clipping size, since the twin-blade recirculation is a design feature that an aftermarket single blade cannot replicate.
Where it falls short
It is model specific. HRX is a broad family, and not every model in it uses this set, so verify the part number before ordering.
It is also the priciest option in this roundup, and for a mower used mostly to collect clippings rather than mulch them, the money is better spent elsewhere.
7. Greenworks 29712 Replacement Blade Set for 20 in Twin Force Decks
Greenworks Replacement Lawn Mower Blades (Fits : 20′ Mower / 25302)
Matched pair of 9.5 in blades
Heat treated alloy steel
For Greenworks 25302 and 20 in decks
Pros
- Matched pair covers a twin-blade deck in one purchase
- Heat treated steel cuts more precisely than worn stock blades
- Blades remove easily for sharpening
- Lowest cost in the roundup
Cons
- Fitment limited to Greenworks twin force decks like the 25302
- Lowest average rating here at 4.4 with about 6 percent one-star reviews
- Some owners ordered the wrong deck size
Twin-blade decks need matched pairs, and this pack supplies a pair of 9.5-inch blades for the Greenworks twin force 25302 and similar 20-inch decks. The heat treated steel is the upgrade over the dull blade most of these mowers arrive with after a season or two.
Owners highlight the heat treatment specifically, because it holds an edge longer than the thin stamped steel these mowers often ship with. The blades also remove easily, which matters if you plan to sharpen them rather than replace them each season.
One spec on this listing trips people up. Actual blade length runs about an inch shorter than the deck size, so a 20-inch deck takes 9.5-inch blades. That clearance is deliberate and it is why the blades do not hit the deck walls.
At 4.4 stars with roughly 6 percent one-star ratings, this is the lowest average rating in the group, and the pattern behind the low scores is consistent. Buyers who ordered against the wrong deck size or a twin-blade deck that needed a different variant regret the purchase, while owners on listed models are largely satisfied.
That is a fitment problem rather than a quality problem, but it is the same lesson repeated across this roundup: the deck size printed on the mower is only half the answer.
Who this blade suits
This suits Greenworks twin force 25302 owners and comparable 20-inch twin-blade decks who want the cheapest correct replacement. It is the sensible pick for a second mower on a property where precision fitment is already known.
It also suits owners who sharpen. Because these blades remove easily, a sharpening service cycle costs less than replacing the pair every season.
Where it falls short
Fitment is the narrowest in the roundup. Single-blade Greenworks decks and different 19-inch or 20-inch variants need a different part entirely.
At 4.4 stars it also has the widest spread of negative feedback here, so verify the model number twice before ordering.
8. Greenworks 29512 Replacement Blade for 16 in Corded Decks
Greenworks Replacement Lawn Mower Blade (Fits : 16′ Mower / 25322 / 25242)
15.75 in blade length for a 16 in deck
Forged one-piece alloy steel
11 oz, fits models 25322 and 25242
Pros
- Blade length engineered exactly for 16 inch Greenworks corded decks
- Forged from a single piece of alloy steel for wear resistance
- Clean even cut with easy direct-fit installation
- 4.5 stars with 77 percent five-star ratings
Cons
- Fits only Greenworks 16 inch corded models 25322 and 25242
- Single blade pack with no spare included
- Will not fit 20 inch twin-blade decks
Small corded decks are where mismatched blades cause the most confusion, because 16 inches is not a standard walk-behind size. This Greenworks blade is 15.75 inches long, and that fraction of an inch is not a rounding error. It is the difference between clearing the deck and hitting it.
It is forged from a single piece of alloy steel rather than stamped, which is why it holds an edge and resists impact better than a thin stamped blade of the same length. Owners on the 25322 and 25242 models report a clean, even cut and a swap that needs no modification.
At 11 ounces it is one of the lightest blades in the roundup, and that matters on a small corded motor with limited torque. Heavy aftermarket blades on small decks are a common cause of the bogging complaints that get blamed on the battery or the motor.
The main complaint pattern is straightforward. Owners of other deck sizes expected a universal fit because the listing sits next to bigger blades in the same category. These blades are specific to the listed models and nothing else.
Because this is a single blade pack, you will not have a spare. If your deck is a single-blade design, that is fine, but it is worth knowing before you need a second one mid-season.
Who this blade suits
This suits owners of the Greenworks 25322 and 25242 corded 16-inch mowers, and anyone who wants a forged blade rather than a stamped one on a small deck.
The light weight is a genuine benefit for small electric decks, where every extra fraction of a pound shows up as slower cutting in thick grass.
Where it falls short
It is the least versatile blade in the roundup, covering exactly two models. There is no cross-platform value in it beyond those decks.
It is a plain OEM replacement rather than a mulching or high lift design, so switching it in will not change how clippings move through the deck.
9. GICOOL 2105-1 Mulching Blade with 5/8 in Round Mounting Pattern
GICOOL 406712 Mulching Blade with 5/8” Circle Mounting Pattern for 21” Deck Push Lawn Mower Craftsman Husqvarna 532406712 165833 175064 189028 532189028
21 in long, 2-3/16 in wide, 1/8 in thick
Round 5/8 in center hole, 1 in air lift
40MnB steel, 1.65 lb
Pros
- Replaces a long list of common AYP
- Husqvarna and Poulan OEM numbers
- 3-in-1 design for mulching
- bagging and side discharge
- High lift wing improves bagging airflow and fill
- 4.6 stars with 83 percent five-star ratings
Cons
- Fits only a round 5/8 in center hole and will not work on star hubs
- Protective edge coating must wear off before full sharpness
This is the most interesting fit in the roundup because of the center hole. It uses a plain round 5/8 inch hole, not a bow tie and not a 5-point star, and that single detail makes it fit a set of decks nothing else here covers.
It replaces a long list of common AYP, Husqvarna and Poulan numbers including 165833, 175064, 189028, 406712, 176135, 159267, 175052 and 406706 along with their 532-prefixed equivalents. The blade is 21 inches long, 2-3/16 inches wide and 1/8 inch thick with an inch of air lift.
What makes it a 3-in-1 is the combination of a multi-curve profile that chops clippings and a high lift wing that pulls air through the deck. The high lift wing is the part that matters for bagging. Owners report better bag fill and fewer clumps than a standard blade, which is a measurable difference on wet spring grass.
The 40MnB steel is a boron-treated alloy, and the 4.6 rating with 83 percent five-star reviews at the number three spot in the category reflects how well it holds up. The consistent warning from reviewers is to verify the round 5/8 inch center hole before ordering, because star-pattern decks will not accept this blade no matter how close the deck size looks.
Who this blade suits
This suits owners of a 21-inch walk-behind with a round 5/8 inch spindle who want one blade that handles mulching, bagging, and side discharge. It is the pick if your machine is on the compatibility list and you mow in changing conditions.
If you bag more than you mulch, this is the blade to buy over a flat mulching profile. The high lift wing is the feature that changes bag fill.
Where it falls short
The round hole is a hard limit. Star-pattern and bow tie hubs are physically incompatible, and this is the single most important check before ordering.
The protective edge coating has to wear off before the blade cuts at full sharpness, which can make the first cut feel muted if you are judging the blade on it.
10. EGO POWER+ AB2101D Mulching Blades 2-Pack for Select Cut Mowers
EGO POWER+ 21″ Mulching Blades for Electric Lawn Mowers LM2133/LM2130/LM2135SP/LM2130SP/LM2156SP/LM2150SP, 2-Pack – AB2101D
Two all-steel blades per pack
Interchangeable lower blade on Select Cut system
2.55 lb pack
Pros
- Two-blade pack covers both positions at once
- All-steel heavy duty construction for mulching and bagging
- Genuine EGO fit on the listed Select Cut models
- 4.6 stars with 83 percent five-star ratings
Cons
- Nuts and bolts are not included so you must reuse existing hardware
- Only interchangeable with the listed Select Cut mower models
EGO’s Select Cut system uses a stacked multi-blade arrangement where the lower blade is the consumable part, and this two-pack replaces both positions. That is the reason to buy it as a pack rather than one blade at a time, since the two lower blades wear at different rates and a mismatched pair cuts unevenly.
All-steel construction is a step up from stamped blades, and owners credit it with a clean cut that holds up through thick grass. It is a heavy duty mulching and bagging blade, so it covers both modes on the listed platforms.
Fitment covers the EGO POWER+ 56V Select Cut range: LM2156SP, LM2150SP, LM2135SP, LM2130SP, LM2133 and LM2130. The practical note that catches everyone is that nuts and bolts are not included, so you need the original hardware or equivalent fasteners on hand before you start.
At 2.55 pounds for the pack, the pair is heavier than a single walk-behind blade. On a battery platform that weight is manageable, but it is still worth noting that a heavier blade is a heavier load for the motor to accelerate each time the mower starts.
Who this blade suits
This suits owners of the listed EGO Select Cut mowers who want a matched lower-blade pair replaced in one order. It is the pick if your cut has gone uneven or your mower is struggling to finish a pass in taller grass.
For owners of the simpler LM2100-series decks, the EGO blade at number two is the correct part instead.
Where it falls short
No mounting hardware is supplied, so a first-time swap requires sourcing fasteners separately if the originals are missing or rusted.
It only works on the Select Cut models listed. It is not interchangeable with the standard single-blade EGO decks, and the two parts look similar from a distance.
How to Measure Your Mower’s Blade in 3 Minutes
Safety first. Disconnect the spark plug wire on a gas mower or pull the battery pack on a cordless mower before you touch anything. Set the deck to its lowest cutting height, block the deck so it cannot drop, wear gloves, and never let the blade come within reach of your fingers while you loosen the spindle bolt. A blade that is sharp enough to cut grass is more than sharp enough to draw blood.
Then work through these steps.
Measure tip to tip. Lay the old blade on a flat surface and measure from one cutting tip to the other, in inches, not along the center hole. Write the number down exactly. This is the single number a listing means when it says blade length.
Note the width. Measure the blade at its widest point. Most walk-behind blades run 2-1/4 inches and riding blades run wider.
Identify the center hole. A bow tie pattern has two elongated lobes, a 5-point star has five notches, and a plain round hole is just a circle. This pattern must match your spindle exactly.
Measure the center hole itself. Common sizes include 5/16 inch, 7/16 inch and 5/8 inch. A hole that is even a fraction too small will not go on.
Find the OEM part number. Most blades carry a stamped number. Cross-check it against the replaced numbers listed on the product page, and confirm the deck size matches.
Check the direction of the cutting edge. Blades cut in one direction only, and a few models sweep the edge toward a specific side of the deck. Owners on r/lawnmowers warn against guessing here, so match the original blade.
A useful shortcut: some blades are roughly an inch shorter than the deck size to allow tip clearance. That is why a 20-inch deck takes a 9.5-inch blade, and why a 48-inch deck takes blades under 17 inches long. Deck size is a starting point for the search, not the answer.
Which Blade Type Is Best for Your Job
Mulching and 3-in-1 blades – best for lawns cut in place, returning clippings to the turf. The blade recirculates clippings into the deck to be cut repeatedly, which returns nutrients and reduces what ends up in a bag. A 3-in-1 combination blade adds a high lift wing so the same part can bag or side discharge when conditions change. The downside is that combination profiles compromise slightly on any single job, and a pure mulching blade produces the finest clipping.
High lift blades – best for bagging, wet grass, and collecting leaves. The wing on the blade creates suction that stands grass up and drives clippings into the bag. The downside is that the extra drag costs engine power and fuel, and it can bog a small-displacement walk-behind on heavy growth.
Low lift blades – best for dry, dusty, or sandy lawns. The flatter profile keeps clippings moving without stirring as much dust into the air. The downside is poor bagging, so low lift is the wrong pick if you bag on sandy ground.
Standard or OEM blades – best for direct-fit replacement and durability. These are the blades the machine was engineered around, usually hardened steel at the thickness the spindle and engine were designed to handle. The downside is that OEM profiles are often plain, so mulching performance is usually the weakest of the four.
On blade types generally, serrated Oregon Gator style teeth and higher-lift geometry are the fastest route to a visibly better cut than a worn factory blade. Owners on r/JohnDeereLawnMachines describe exactly that result on a 48-inch deck, where short factory edges left rows of uncut clippings until the deck was refitted with aftermarket mulching blades.
One caution on the popular advice that blades should never be sharpened to a razor edge. Cutting a grass blade rather than tearing it matters far more than how sharp the edge is, and an over-sharpened edge can tear the turf and encourage disease. A clean, balanced, factory-original bevel is the goal.
OEM vs Aftermarket Blades: Which Should You Buy
OEM blades are the right choice when fitment is uncertain or the mower is newer than a few seasons. A genuine part bolts on, matches the deck weight the engine was designed around, and carries the mulching geometry the platform was engineered to produce. That certainty is what you are paying for, and it is worth more than a small per-blade saving when a wrong fit means returns and a mower out of service.
Aftermarket blades are the right choice when the OEM number is known and the job needs more. Aftermarket wins on blade shape. A plain OEM blade rarely mulches as finely as a serrated Gator pattern or lifts as well as a dedicated high lift wing, and that difference shows up in clipping size and bag fill. Owner reports across lawn forums consistently favor aftermarket serrated mulching blades for cut quality once fit is confirmed.
There is a middle path that works well. Many owners buy an OEM-equivalent blade in a multi-pack, so fitment is guaranteed and a spare is already on the shelf. That is the reasoning behind the two 21-inch packs in this roundup.
Watch the weight. A heavier aftermarket blade on a small engine wastes power it needs for cutting, and forum users describe that as a mower that bogs down and runs hot. A heavier blade on a tractor is a different conversation, where strength and balance matter more than acceleration.
When to Sharpen and When to Replace
Sharpen the blade when the edge is dull but the steel is intact. Signs are torn, frayed grass tips, slower mowing speed, and more time spent on the same lawn. A blade in this condition usually has two or three sharpening cycles left in it.
Replace the blade when it is bent or cracked. Run a finger along the cutting edge with gloves on, and look for warping, twists, or a chipped section. A bent blade is an imbalance, and an imbalanced blade destroys spindle bearings and spindle housings over time. Do not hammer a bent blade straight. Heat-treating and work-hardening make that repair unreliable.
Replace the blade when it is too short for the deck. This is the least obvious case. A blade that has been reground several times can end up well under the length the deck was designed around, and the symptom is rows of uncut clippings left behind the mower.
Replace all blades on a multi-blade deck at the same time. Mixed old and new blades on the same deck produce vibration because the new blades cut a deeper path than the worn ones. Owners on r/lawnmowers point out that balance on an inherited or used mower deserves attention at the same time, since worn spindles and bearings can be part of the problem.
As a rough guide, edge retention depends more on the job than the brand. Bagging and sandy soil chew edges quickly, mulch-only mowing on a well-maintained lawn is gentler, and stone in the lawn is what ends blades early. Sharpen once a season on most machines and replace when the profile is gone.
Frequently Asked Questions
What mower blade gives the best cut?
Cut quality comes down to a sharp, correctly sized, balanced blade rather than any single brand. A serrated mulching blade with more cutting surface than the factory edge produces the cleanest cut on most lawns, and OEM-equivalent blades built to the deck’s original dimensions fit and balance exactly. The key is matching blade length tip to tip, center hole pattern, and OEM number to your deck before judging the design.
What are the typical lengths of lawnmower blades?
Walk-behind blades typically run 18 to 22 inches, though a 20-inch deck often takes a 9.5-inch blade and a 16-inch deck takes about 15.75 inches. Riding mower and tractor blades are shorter than the deck width suggests, often 16 to 21 inches for 42-inch and 48-inch decks. Measure your old blade tip to tip, because the clearance gap is built into the design.
Are lawn mower blades universal?
No. A blade must match your deck on three things: length tip to tip, center hole diameter, and mounting pattern such as bow tie, 5-point star, or a plain round hole. Deck size alone is not enough, because two different machines with 21-inch decks can use completely different spindles. Cross-check the stamped OEM part number before ordering to guarantee a direct fit.
When should I sharpen versus replace mower blades?
Sharpen when the edge is frayed or torn but the steel is still straight, which usually happens once a season. Replace when the blade is bent, cracked, or has been reground down below the length the deck needs, since short blades leave rows of uncut clippings. Never hammer a bent blade straight, and replace all blades on a multi-blade deck together so they cut at the same depth.
What are OEM mower blades?
An OEM blade is the factory part made or specified by the mower manufacturer, such as the genuine Honda twin MicroCut set or the EGO cordless blades. It guarantees exact fit, the original weight and balance, and the mulching geometry the machine was engineered to produce. Aftermarket blades are cheaper and often offer better mulching or lift, but require you to verify length, center hole, and OEM number yourself.
The Verdict
There is no single best replacement mower blade for everyone, and anyone who tells you otherwise is skipping the fitment check. Measure tip to tip, confirm the center hole pattern, and match the OEM number first, then choose the profile your mowing actually calls for.
On that basis, the MaxPower 331528B is our top pick for 2026 because it pairs a 4.7 rating across more than 11,000 reviews with the broadest 21-inch fitment in the group. The UDC two-pack is the value pick, the UDC 48-inch three-pack is the choice for riding decks, and the Honda set wins wherever the mower is a compatible HRX. If you tell us your mower brand, model, deck size, and whether you mulch, bag, or side discharge, we can point you at the exact part.