Best Replacement Mower Blades, and the Reel and Robot Mowers Listed Beside Them
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A dull or bent blade tears grass instead of cutting it, and an ill-fitting blade can cause vibration or damage to the deck. Choosing a replacement starts with the model number on your mower, not the price on the listing. This guide covers nine products. Six are replacement blades for specific mower types. Three are complete mowers or a mower bundle that happens to include blades, and they are included here so you can see how they differ. The specifications come from the product data compiled for this article. We did not test any of these parts, so confirm each fit before you install.
Quick answer: match the blade to the mower
- Greenworks or Sthovd-style 21-inch mowers: the Sthovd 21-inch blade lists the longest set of compatible models.
- Black & Decker mulching mowers with 18-inch decks: the USA Mower Blades low-lift blade lists the 18-inch models it fits.
- Black & Decker part 90541433-01: two listings share this part number and the same compatibility list.
- Universal 21-inch mulching mower: the Maxpower blade comes with washers for different spindle sizes.
- Small lawns with a push reel mower: a 14-inch or 18-inch reel mower, not a blade swap.
- A hands-off lawn of about a quarter to half an acre: a robot mower bundle with replacement blades and a cleaning kit.
Groups at a glance
The nine products fall into four groups. The group tells you whether you need a replacement part or a complete machine. For the blade side, see the Black+Decker mower blade guide and the electric mower pros and cons.
- Replacement blades for a specific brand or model (5): the Greenworks 19-inch blade, the Sthovd 21-inch blade, two Black & Decker part 90541433-01 listings, and the USA Mower Blades BD18BP.
- A universal 21-inch mulching blade (1): the Maxpower 331981B, which includes washers for different spindle sizes.
- Complete push reel mowers (2): the 14-inch American Lawn Mower 1204-14 and the 18-inch 1815-18. Each one includes its own blades, so it is not a blade swap.
- A robot mower bundle (1): the DREAME A3 AWD, which includes a replacement blade set and a cleaning kit.
Comparison table
| Product | Type | Cut width or size | Fit or compatibility |
|---|---|---|---|
| American Lawn Mower 1204-14 | Push reel mower | 14 inches | Complete mower, 4 blades |
| American Lawn Mower 1815-18 | Push reel mower | 18 inches | Complete mower, 5 blades |
| DREAME A3 AWD robot mower bundle | Robot mower with blade set | Lawns of 0.25 to 0.5 acre | Bundle with replacement blades |
| Maxpower 331981B | Universal mulching blade | 21 inches | Universal 21-inch mowers, with washers |
| Greenworks blade | Corded electric blade | 17.72 inches long | Greenworks 19-inch models |
| Sthovd MO48L4422 blade | Blade, carbon steel | 21-inch Greenworks | Many Greenworks 21-inch and battery models |
| OEM 90541433-01 (generic) | Mulch blade | Not stated in the listing | Black & Decker CM1936 and CMM1200 models |
| Black & Decker OEM 90541433-01 | Mulch blade | Not stated in the listing | Same models as above |
| USA Mower Blades BD18BP | Low-lift mulching blade | 17.5 by 1.75 inches | Black & Decker 18-inch decks |
Who should buy a replacement blade
- Owners whose mower has a worn or bent blade and a known model number.
- Owners with a Greenworks, Black & Decker, or 21-inch universal mower who need a direct replacement.
- Owners who want a blade for a mulching deck and can confirm the mulching type.
Who should skip a blade
- Owners who cannot read the model number on the mower or deck. Measure the blade length and center hole before ordering.
- Owners who need a complete reel or robot mower. Three products here are complete machines.
- Owners who expect a blade to repair a bent spindle or deck. Replacing the blade will not fix a damaged mount.
Real situations where the right blade matters
- A mower that leaves ragged tips. A dull or bent blade is the most common cause. Replacing it with the exact part for your deck restores a clean cut.
- A mulching mower with grass clippings on the lawn. A mulching blade has a different lift and shape than a standard blade. The USA Mower Blades part lists a low-lift design for 18-inch decks.
- A mower that vibrates after sharpening. A blade with the wrong center hole or length can wobble. Check the hole size and the washers before tightening.
- A small lawn with no gas or electric mower. A push reel mower uses a cutting action that does not need a motor. Two reel models are listed here.
- A 21-inch Greenworks-style mower on a different battery group. The Sthovd listing sorts its models into 40V, 60V, 80V, and 2 x 24V groups, and it names 40V G-MAX models separately. Find your model in one group of the table below before you order.
- A 19-inch corded Greenworks deck. The Greenworks blade is 17.72 inches long and is listed for corded models 2501302, 2500502, 25223, 25272, and 25292. Measure the old blade first, because a 21-inch blade is a different part.
- A universal blade on a spindle that does not match. The Maxpower kit includes a cover washer and six reducing washers in sizes from 3/8 to 13/16 inch, so you can test the washer set that matches your spindle before you tighten the bolt.
How to choose: five checks
1. Model number. The mower or deck model is the first check. The Greenworks, Black & Decker, and Maxpower listings each name models or part numbers.
2. Blade length and width. The Greenworks 19-inch blade is 17.72 inches long, the Maxpower is 21 inches long, and the USA Mower Blades part is 17.5 by 1.75 inches.
3. Center hole and washers. The Maxpower blade includes a cover washer and six reducing washers in sizes from 3/8 to 13/16 inch. The USA Mower Blades part lists a 1-inch center hole.
4. Material. The Sthovd blade is carbon steel with a rust-proof coating. The Greenworks blade is alloy steel forged from one piece. The two Black & Decker-style parts list plastic, which is unusual for a mower blade, so confirm the material on the part.
5. Mower type. A reel mower needs a reel-style blade set, not a rotary blade. A robot mower uses its own blade set and cleaning kit.
Measure before you buy
- Remove the old blade and measure its length, width, and thickness.
- Count the blade slots and check the center hole diameter.
- Compare the mower model number with the compatibility list on each product.
- For a reel mower, measure the cut width and the wheel size.
- For a robot mower, check the lawn size and the slope it can climb.
Blade measurement checklist
Use this table when you pull the old blade. Each row names the figure to check and the figures the listings give, so you can compare your part against them.
| Check | How to measure or confirm | Figures in this guide |
|---|---|---|
| Blade length | Measure from tip to tip | Greenworks 19-inch blade 17.72 inches; Maxpower 21 inches; USA BD18BP 17.5 inches |
| Blade width | Measure across the widest part of the blade | Maxpower 2.5 inches; USA BD18BP 1.75 inches |
| Thickness | Measure the flat section of the blade | USA BD18BP 0.150 inch |
| Center hole | Measure the diameter of the hole | Maxpower 1 inch; USA BD18BP 1 inch |
| Washers | Count the washers and match them to the spindle | Maxpower cover washer and six reducing washers, 3/8 to 13/16 inch |
| Part number | Read the number printed on the old blade | 90541433-01 for the two Black & Decker listings; 90548199 or 90548199-01 for the USA BD18BP |
| Material | Read the label or the listing before you install | Sthovd carbon steel; Greenworks forged steel; Black & Decker-style parts listed as plastic |
Product-by-product notes
1. American Lawn Mower 1204-14 push reel mower
American Lawn Mower 1204-14 14-Inch 4-Blade Push Reel Lawn Mower, Red
This is a manual reel mower with a 14-inch cut and four blades. It has 8.5-inch polymer wheels and a steel frame. The cutting height has three positions, but the minimum and maximum heights are Not confirmed: the specification fields give 1.3 to 4.45 inches, while the description gives 0.5 to 1.75 inches. The weight is Not confirmed too: one field gives 1 kilogram, the description gives 19 pounds. The reel cuts without bruising grass, and the reel works best when you cut no more than one third of the grass blade at a time. It works best on small lawns and when the grass is dry. Tall grass needs multiple passes.
Best for: small, flat lawns with regular mowing.
Skip if: your lawn is tall or wet most of the season.
2. American Lawn Mower 1815-18 push reel mower
American Lawn Mower 1815-18 18-Inch 5-Blade Push Reel Lawn Mower, Black
This 18-inch reel mower has five blades and seven height positions. The cutting height is Not confirmed: the specification fields give 1.27 to 6.4 inches, while the description gives 1/2 to 2-3/4 inches. The power source is Not confirmed too: one field says self-propelled, another says manual. The warranty is Not confirmed: the field says 1 year limited, and the feature text mentions a 5-year protection plan. The weight is about 27 pounds, and the listing suggests it works best on dry grass under 4 inches. The wider cut covers more lawn per pass than the 14-inch model.
Best for: a small to medium flat yard with regular mowing.
Skip if: your grass is over 4 inches or you need a warranty term you can confirm.
3. DREAME A3 AWD robot mower bundle with replacement blades
This is a battery-powered robot mower bundle that includes a replacement blade set and a cleaning kit. It uses LiDAR and camera-based navigation, so it does not need a boundary wire. The listing gives a coverage of 0.25 to 0.5 acre, and it lists all-wheel drive for slopes up to 80 percent (38.7 degrees). The cutting height ranges from 1 to 4 inches. The battery charges in about 45 minutes with a 5-amp adapter. It has a 3-year warranty and a 1-year free 4G service period. Schedule mowing at night if you want it quiet, and use the app to set patterns. The listing includes a support phone line, which you can find on the product page.
Best for: a larger lawn with slopes and tree cover that you want to mow on a schedule.
Skip if: you only need a blade swap for an existing mower.
4. Maxpower 331981B universal 21-inch mulching blade
Maxpower 331981B 21-Inch Universal Gold Metal Mulching Lawn Mower Blade
This is a universal blade for 21-inch cut mowers. It measures 21 inches long and 2.5 inches wide, with a 1-inch center hole. The package includes a cover washer and six reducing washers in sizes from 3/8 to 13/16 inch, which helps match different spindles. The alloy steel body weighs about 2 pounds. The blade is made in the USA. The manufacturer warranty states the blade is free from defects.
Best for: owners of 21-inch mulching mowers who need a universal fit and the washers to match.
Skip if: your mower requires a model-specific blade with a different hole or shape.
5. Greenworks replacement blade for 19-inch corded mowers
Greenworks Replacement Lawn Mower Blade for 19-inch Mowers, Model 2501302 and 2500502
This alloy steel blade is designed for Greenworks 19-inch corded mowers. The listing states it is 17.72 inches long and forged from one piece of steel. The compatible models named are 2501302, 2500502, 25223, 25272, and 25292. The listing describes efficient cutting, but it does not give a weight or warranty term you can confirm.
Best for: owners of the named 19-inch Greenworks corded mowers.
Skip if: your model number is not on the compatibility list.
6. Sthovd MO48L4422 blade for Greenworks 21-inch mowers
MO48L4422 Lawn Mower Blade Compatible with Greenworks 21-inch Mowers
This carbon steel blade has a rust-proof coating and an anti-stick surface. The listing gives a long compatibility list: the 21-inch models MO40L4413, MO40L03, and MO48L4422, plus many 80V, 60V, 40V, and 2 x 24V Greenworks models. It also lists direct replacement part numbers, including 333041179, 2905203, 311151519, and 333041179B. The brand is not stated in the listing, and the manufacturer is Sthovd. The blade weighs about 1.3 pounds. Check the model number on your mower against the list, because the part numbers are not interchangeable across all models.
Best for: Greenworks 21-inch owners who need a long-list compatible blade.
Skip if: your model is not in the compatibility list.
7. OEM 90541433-01 mulch blade for Black & Decker mowers, generic listing
OEM 90541433-01 Replacement for Black & Decker Lawn Mower Mulch Blade, CM1936 and CMM1200 Models
This is a replacement mulch blade with part number 90541433-01. The compatibility list names CM1936 Type 1 and 2, CM1936Z Type 1, CM1936ZF2 Type 1, CMM1200 Type 3 and 4, and SPCM1936 Type 1. The brand field is blank and the manufacturer is shown as generic. The material is listed as plastic, which is unusual for a mower blade, so confirm the material and the cutting edge before you install it. The part weighs about 1.1 pounds. The dimensions are listed as 1 by 1 by 1 inch, which is a packaging size, not the blade size.
Best for: owners who need a direct part for the listed Black & Decker models.
Skip if: you need a metal blade and the listing does not confirm the material.
8. Black & Decker OEM 90541433-01 mulch blade
Black & Decker OEM 90541433-01 Lawn Mower Blade, CM1936 and CMM1200 Models
This is the Black & Decker-labeled version of the same part number, 90541433-01, with the same compatibility list. The manufacturer field names Black & Decker, which may matter if you want the brand printed on the box. The material is listed as plastic, the same caution as the generic version. The weight is about 1.1 pounds. Since the part number and compatibility match, compare the label on the old blade with the number on this package before you install it.
Best for: owners who want the brand-labeled version of the same part.
Skip if: the part number on the old blade does not read 90541433-01.
9. USA Mower Blades BD18BP low-lift mulching blade
USA Mower Blades 2 BD18BP Low Lift Mulching Blade, Replaces Black & Decker 90548199
This blade replaces Black & Decker part 90548199 and lists 90548199-01 as well. It measures 17.5 inches long, 1.75 inches wide, and 0.150 inches thick, with a 1-inch center hole. The low-lift design is listed at 3/8 inch, which is a mulching style. It is listed as fitting Black & Decker MM675, LM175, and CM1836 Type 1 and 2 mowers with 18-inch decks. The brand field is blank and the manufacturer is USA Mower Blades. The blade is made in the USA and weighs about 2.5 pounds.
Best for: Black & Decker 18-inch deck owners who want a mulching blade.
Skip if: your deck is not 18 inches or your mower is not on the listed models.
Reel and robot specs side by side
These three products are complete machines, so they are compared on different features than the blades. Several fields conflict, so the table shows each figure as the compiled data gives it.
| Feature | American 1204-14 | American 1815-18 | DREAME A3 AWD bundle |
|---|---|---|---|
| Cutting width | 14 inches | 18 inches | 7.87 inches (listed cutting width) |
| Power source | Manual | Self-propelled in one field, manual in another | Battery powered |
| Operation | Manual | Not stated in the listing | Automatic |
| Weight | 1 kilogram in one field, 19 pounds in the description | About 27 pounds | 26.4 pounds |
| Wheel size | 8.5 inches | 16 centimeters | Not stated in the listing |
| Cutting height | 1.3 to 4.45 inches in the fields; 0.5 to 1.75 inches in the description | 1.27 to 6.4 inches in the fields; 1/2 to 2-3/4 inches in the description | 1 to 4 inches |
| Height positions | 3 | 7 | Not stated in the listing |
| Warranty | Not stated in the listing | 1 year limited in one field; 5-year protection plan mentioned | 3-year warranty and 1-year free 4G service |
| Coverage | Small, flat lawns | Small to medium yards | 0.25 to 0.5 acre |
Sthovd blade compatibility groups
The Sthovd MO48L4422 listing sorts its model numbers into the groups below. Find your mower’s model number in these groups before you order.
| Group | Model numbers in the listing |
|---|---|
| 21-inch Greenworks | MO40L4413, MO40L03, MO48L4422 |
| 80V mowers | 2550702, 2501202, 2500402, 2550402, 1356602, 1356702, 1356402, 1356502, 2533902, 2541302, 2533402, 2533602, 2502202, 2506902, 2515902, 2534102 |
| 60V mowers | 2531702, 2545102, 2531602, 2531702T, 2531602T, 2535102T, 2504902T, 2509802 |
| 40V mowers | 2515502, 2527302AZ, 1306402AZ, 2525202, 1348402-HB, 2525102AZ, 2506502AZ, 2506602, 2513502 |
| 2 x 24V mowers | 2533202, 2532502, 2532702, 2532902 |
| 40V G-MAX | MO40L4413, MO40L02, MO40L01, MO40L03, MO40L2512, LMF413, LMF414, LMF415, M-210 |
| 60V series | MO60L00, MO60L06, MO60L01, MO60L424, MO60L516, 60LM21P |
| 80V Pro series | MO80L410, MO80L41, MO80L00, MO80L510, LMB401, LMB408, LMB454, LMB455, LMB456, GLM801600, GLM801602 |
| 2 x 24V series | MO48L4422, LME475, MO48L520 |
Listing claims to verify
Product descriptions include claims about cutting, grass care, and quiet operation. None of these claims were tested for this guide. The table separates each claim from the spec you can check.
| Product | Claim in the listing | What to check |
|---|---|---|
| Sthovd MO48L4422 | Faster, wider mowing, less cutting drag, and better clipping ejection | The compiled data gives no cutting width for this blade, so compare the old blade and your deck |
| Greenworks 19-inch | Efficient cutting and a clean, even cut | The 17.72-inch length and the named 19-inch model list |
| American 1204-14 | Cuts without bruising the grass; environment-friendly and noise-free | The cutting height range and the grass height limit |
| American 1815-18 | Works best on dry grass under 4 inches | The cutting height fields and the warranty term |
| DREAME A3 AWD | Ultra-quiet, with day or night operation | The scheduling options and the battery figures |
| Maxpower 331981B | Made in the USA, and free from defects under the manufacturer warranty | The washer set and the 1-inch center hole |
A claim with no matching spec in the compiled data should be treated as unverified, not as a confirmed feature.
Installation and safety
- Disconnect power first. Remove the spark plug wire or battery, or unplug the electric mower, before you touch the blade.
- Check the old blade. Note the blade length, hole size, and direction of the edge.
- Use the washers. For universal blades, match the washer size to the spindle.
- Tighten to the mower’s specification. Use the torque in the mower manual.
- Balance the blade. A blade that is not balanced causes vibration.
- Store spares dry. Keep spare blades away from moisture to prevent rust.
Common mistakes
- Ordering by the mower brand alone instead of the model number.
- Mixing up 19-inch and 21-inch Greenworks blades.
- Ignoring the center hole size when using a universal blade.
- Buying a reel mower when only a blade is needed.
- Installing a plastic-material part on a mower that needs a metal blade.
Frequently asked questions
How do I know which blade fits my mower?
Find the model number on the mower or deck, then compare it with the compatibility list. Measure the old blade if you cannot find the number.
Can a universal blade replace a model-specific blade?
Sometimes. The Maxpower blade is universal for 21-inch mowers, but the washers and hole size still need to match.
Are the two Black & Decker part listings the same?
The part number 90541433-01 and the compatibility list are the same. The manufacturer field differs, so compare the old blade label first.
What is the difference between a reel mower and a blade replacement?
A reel mower is a complete machine with its own blades. A blade replacement is one part for a motor mower.
Does a robot mower need a blade set?
The DREAME bundle includes a blade set and a cleaning kit. Other robot mowers may need separate blades, so check the manufacturer guide.
Which blades list a 1-inch center hole?
The Maxpower 331981B and the USA Mower Blades BD18BP both list a 1-inch center hole. The compiled data gives no hole size for the Greenworks or Sthovd blades, so measure the old blade before you order either one.
How tall can the 14-inch reel mower cut?
The compiled data says the 1204-14 can cut grass up to 4 inches tall and is less effective on taller grass. The product notes give both of the height ranges that appear in its fields and description.
Which products are described as mulching blades?
Three products are described that way: the Maxpower 331981B, the USA Mower Blades BD18BP low-lift blade, and the two Black & Decker part 90541433-01 listings.
Which listed cut is widest?
Among the mowers and blades with a stated cutting width, the American 1815-18 reel mower is listed at 18 inches, the widest in this guide. The DREAME bundle lists 7.87 inches, but that is a robot cutter, so compare it with the reel widths with care.
Bottom line
Start with the model number on your mower. For a Greenworks or Black & Decker mower, choose the blade that names your exact model. For a universal 21-inch mulching mower, the Maxpower blade and its washers cover several spindles. For a small flat lawn without a motor, a reel mower is a separate purchase, not a blade. For a larger, sloped yard, the robot mower bundle includes its own blades and cleaning kit.
