PowerSmart 21-Inch Replacement Blades: OEM and Compatible Picks
Every spec and price on this page is quoted from the Amazon listing for that model. Scores are out of 10, based on listed specifications and buyer feedback. Nothing here was handled or measured by us.
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The right PowerSmart 21 inch blade depends on your mower’s model number, not just its deck size. PowerSmart sells a genuine 21-inch blade, part 303071739, for the DB8721P, DV8621C2, DV8621P2 and DV8621S2, but other 21-inch PowerSmart mowers such as the V8621S, DV8621S and PS76821 use different blades with different hole patterns. Match the model number on your mower’s deck label to the blade listing, and you can swap it in and get back to your game in one short session.
This PowerSmart blade comparison covers four blades. Two are genuine PowerSmart replacement mower blades, one 21-inch and one 18-inch. Two are third-party blades made by perfektGarten that are sold as compatible with specific PowerSmart models; they are not made by PowerSmart, and we flag that clearly. One of them is a mulching blade. We compared the listings, dimensions and model lists to show which PowerSmart blade to buy.
JOB SHEET
Which PowerSmart Lawn Mower Blade Should You Buy
- DB8721P, DV8621C2, DV8621P2 or DV8621S2 mower: PowerSmart 21 in. Replacement Mower Blade
go to no. 01 - V8621S or DV8621S mower, mostly bagging: perfektGarten 53 CM 21″ lawnmower blade
go to no. 02 - PS76821 mower, mulching: perfektGarten 53 CM 21″ lawnmower mulching blade
go to no. 03 - DB8618P, DV8618P or V8618P 18-inch mower: PowerSmart 18 in. Replacement Mower Blade
go to no. 04
No. 01
of 4
Power Smart
PowerSmart 21 in. Replacement Mower Blade
8.8
/10
Our score
Affiliate link. Price and stock live at Amazon and change there, not on this page.
Best for
Owners of DB8721P and DV8621 21-inch mowers
Pros
- Genuine PowerSmart part
- 3-in-1 mulch, bag, discharge
- Model list printed on listing
- Steel construction
Cons
- Fits only listed 21-inch models
- Hole sizes not listed
The PowerSmart 21 in. Replacement Mower Blade is the genuine OEM part, number 303071739. The listing names four compatible 21-inch gas mowers: DB8721P, DV8621C2, DV8621P2 and DV8621S2. If your deck label shows one of those, this is the safest choice, because it comes from the same manufacturer as your mower.
It is a 3-in-1 blade for mulching, bagging and side discharging. The stated dimensions are 508mm (20 inches) long, 57mm (2.2 inches) wide and 3.5mm thick, for a 21-inch deck; a blade slightly shorter than the deck width is normal, since the deck housing needs clearance. It is steel, weighs 1.7 pounds, and the description says it produces finer clippings that reduce clumping and let the bag hold more.
The listing does not give the center or side hole dimensions, so rely on the model list rather than measuring. If your 21-inch PowerSmart is a V8621S, DV8621S or PS76821, this is not the listed fit, and one of the perfektGarten blades below is.
- Genuine PowerSmart part 303071739
- Fits DB8721P, DV8621C2, DV8621P2, DV8621S2
- 3-in-1: mulch, bag, side discharge
- 508 x 57 x 3.5 mm steel blade
No. 02
of 4
perfekt Garten
perfektGarten 53 CM 21″ lawnmower blade
8.2
/10
Our score
Affiliate link. Price and stock live at Amazon and change there, not on this page.
Best for
PS76821 owners who mulch
Pros
- 3-in-1 mulching profile
- Thicker 4.1 mm steel
- Replaces part 303240638
- Heat treated to 45 HRC
Cons
- Third-party, not PowerSmart made
- Fits one listed model only
Best for
V8621S and DV8621S owners wanting bagging lift
Pros
- Full hole dimensions listed
- Heat treated to 45 HRC
- Replaces part 202270012
- Bent for bag filling
Cons
- Third-party, not PowerSmart made
- Not described as mulching
The perfektGarten 53 CM 21″ lawnmower blade is a third-party blade made by perfektGarten, not PowerSmart. It is listed as compatible with the PowerSmart V8621S blade position and the DV8621S, and it replaces part 202270012. That makes it the option for owners of those two models, which are not on the genuine 21-inch blade’s list.
This listing is unusually thorough on dimensions: 530mm long, 50mm wide, 3.5mm thick, a 15mm center hole, side holes of 15mm and 12 x 18mm, and 60mm between side hole centers. Those figures let you measure your old blade before ordering. The description says it is bent to throw clippings into the grass collector until the bag is full and also works for side discharge. It does not describe the blade as a mulching blade.
perfektGarten says its blades use certified carbon steel, are sharpened, bent and balanced, and heat treated by quenching and tempering to 45 HRC. Choose this if you own a V8621S or DV8621S and bag most of your clippings. If you want to mulch, the listing does not support that use.
- Listed for PowerSmart V8621S and DV8621S
- Replaces part 202270012
- Full hole and size dimensions published
- Heat treated to 45 HRC
No. 03
of 4
perfekt Garten
perfektGarten 53 CM 21″ lawnmower mulching blade
9.0
/10
Our score
Affiliate link. Price and stock live at Amazon and change there, not on this page.
The perfektGarten 53 CM 21″ lawnmower mulching blade is another third-party part, listed as compatible with the PowerSmart PS76821 and replacing part 303240638. It is a 3-in-1 blade for throwing, catching and mulching, so it is the PowerSmart mulching blade option in this group for PS76821 owners.
Its dimensions differ from the other perfektGarten blade: 530mm long, 56mm wide and a thicker 4.1mm, with a 12.2mm center hole, 9.5 x 12.5mm side holes and 62mm between side hole centers. The different hole pattern is exactly why these blades are not interchangeable even though both are 21 inches. Heat treatment is the same 45 HRC, and the listing claims a life of at least three seasons. Both perfektGarten listings show identical package dimensions, which do not reflect the width difference, so rely on the millimeter figures.
Pick this only if your mower is a PS76821. For any other 21-inch model, check the lists above.
No. 04
of 4
Power Smart
PowerSmart 18 in. Replacement Mower Blade
8.2
/10
Our score
Affiliate link. Price and stock live at Amazon and change there, not on this page.
Best for
Owners of 18-inch PowerSmart gas mowers
Pros
- Genuine PowerSmart part
- 3-in-1 mulch, bag, discharge
- Fits DB8618P, DV8618P, V8618P
Cons
- Not for 21-inch decks
- Description cites wrong part number
The PowerSmart 18 in. Replacement Mower Blade is the genuine part 303160998 for the smaller PowerSmart 18 inch blade deck. It fits the DB8618P, DV8618P and V8618P 18-inch gas mowers with bag. It is also a 3-in-1 blade for mulching, bagging and side discharge.
It measures 430mm (17 inches) long, 50mm wide and 3mm thick, and weighs 16 ounces. One listing error to note: the description text references part number 303071739, which is the 21-inch blade; the features and model number both say 303160998, so go by those. This blade will not fit a 21-inch deck, and the 21-inch blades will not fit an 18-inch deck.
- Genuine PowerSmart part 303160998
- Fits DB8618P, DV8618P, V8618P
- 3-in-1 mulch, bag, side discharge
What Sets These Models Apart
| Blade | Maker | Listed PowerSmart fit | Length and thickness |
|---|---|---|---|
| 21 in. Replacement Blade | PowerSmart (genuine) | DB8721P, DV8621C2, DV8621P2, DV8621S2 | 508 mm, 3.5 mm |
| perfektGarten 21″ blade | perfektGarten (third party) | V8621S, DV8621S | 530 mm, 3.5 mm |
| perfektGarten 21″ mulching | perfektGarten (third party) | PS76821 | 530 mm, 4.1 mm |
| 18 in. Replacement Blade | PowerSmart (genuine) | DB8618P, DV8618P, V8618P | 430 mm, 3 mm |
Figures in this table are copied from the Amazon listings for these models.
NOTES
Buying Tips for PowerSmart Lawn Mower Blades
Start with the model number on your mower, usually on a label on the deck or near the handle. Deck size alone is not enough: three different 21-inch blades appear here, each for different PowerSmart models with different hole patterns. If you cannot find the label, remove the old blade and measure its length, center hole and side holes against the perfektGarten figures.
Decide between genuine and third-party. Genuine PowerSmart blades carry the brand’s own part numbers and model lists. The perfektGarten blades are made by another company for specific PowerSmart models and publish detailed dimensions and heat-treatment details, which helps when you want to verify fit. Either way, a balanced, sharp blade matters more than the logo.
Handle blades safely. Disconnect the spark plug before working under the deck, wear gloves, and check balance after sharpening. If you enjoy keeping tools sharp, the same care applies in the workshop when you swap a 10-inch table saw blade.
Plan when to replace rather than sharpen. A blade that is bent, cracked or worn thin near the tips should be replaced, not sharpened, because a damaged blade can vibrate and stress the engine crankshaft. Many owners keep a spare blade on hand so they can swap it in immediately and sharpen the old one later at a relaxed pace, the same way you would rotate edges on a three-piece wood chisel set. Torque the blade bolt firmly after installation and check that the curved lift edges point up toward the deck.
FAQ
Which blade fits a PowerSmart V8621S?
Of these four, the perfektGarten 53 CM 21-inch blade is listed as compatible with the V8621S and DV8621S. It replaces part 202270012.
Are the perfektGarten blades made by PowerSmart?
No. They are made by perfektGarten and sold as compatible with specific PowerSmart models. Only the 21-inch and 18-inch replacement blades in this list are genuine PowerSmart parts.
Can I use the 21-inch PowerSmart blade on any 21-inch mower?
No. The listing names four compatible models. Other 21-inch PowerSmart mowers use different part numbers and hole patterns.
Which blade is best for mulching?
The genuine 21-inch and 18-inch PowerSmart blades are 3-in-1 blades that mulch, and the perfektGarten mulching blade is 3-in-1 for the PS76821. The other perfektGarten blade is described for bagging and side discharge.
Why is the 21-inch blade only 20 inches long?
The genuine blade measures 508mm, about 20 inches, for a 21-inch deck. Blades are usually slightly shorter than the deck width so they clear the housing.
Related reading: 21 inch troy bilt push mower blade.
