A well-maintained lawn mower blade is crucial for a clean, healthy cut. Dull or damaged blades tear grass, leaving it vulnerable to disease and creating an unsightly lawn. When it’s time for a replacement, choosing the right blade for your Craftsman 21″ mower can significantly impact your yard’s appearance and the mower’s efficiency.
This roundup simplifies your search by highlighting ten of the best replacement blades available. From dedicated mulching blades to versatile 3-in-1 options and high-performance designs, you’ll find a blade that fits your specific Craftsman model and lawn care needs. We’ve compiled key features and compatibility information to help you make an informed purchase decision.
The Best Craftsman 21-Inch Lawn Mower Blade Replacements
- wyevee 331737B Mulching Lawn Mower Blade
- budrash 942-0741A Mulching Blade for Craftsman 21″ Deck
- Stens 300-121RT-STN Universal 3-in-1 Blade
- KEDAKEJI Lawn Mower Blades 21″ for Troy-Bilt & Craftsman
- GYZJ Lawn Mower Blades for Craftsman Husqvarna Poulan
- Oregon 3 Pack 96-382 Gator G3 Blade 17-1/2″
- 8TEN LawnRAZOR High Lift Blade for MTD Cub Cadet
- Maxpower 331981B 21-Inch Universal Gold Mulching Blade
- Arnold Universal 21-Inch 3-in-1 Mulching Lawn Mower Blade
- Oregon 96-397 Gator G5 High-Lift Lawn Mower Blade
wyevee 331737B Mulching Lawn Mower Blade
This mulching blade from wyevee is engineered for compatibility with a wide range of AYP, Craftsman, Husqvarna, and Poulan 21-inch mowers. It is designed to replace numerous common part numbers, including 165833, 175052, and 532175064. Before purchasing, it is essential to verify your mower’s original part number to ensure a proper fit for models like the Craftsman 917375940 or Husqvarna 5521CM.
The blade is constructed to facilitate optimal mulching performance. Its design helps circulate grass clippings under the deck for multiple cuts, resulting in finer clippings that decompose quickly to nourish your lawn. The installation process is straightforward, requiring you to place the blade with the curved side facing the mower deck for correct operation.
budrash 942-0741A Mulching Blade
Sold in a convenient two-pack, the budrash 942-0741A blades offer a versatile 3-in-1 solution for bagging, discharging, and mulching. They are compatible with several popular Craftsman 247 series mowers, as well as Troy-Bilt TB130 and TB230 models. This makes them an excellent choice for homeowners with multiple mowers or those who want a spare blade on hand.
The blade’s contoured design is made to create a swirling air flow that keeps grass clippings suspended for a longer period. This action allows the sharp cutting edges to recut the clippings into very small pieces. These fine mulched particles can then be returned to the lawn as a natural fertilizer, promoting a healthier turf without the need for bagging.
Stens 300-121RT-STN Universal 3-in-1 Blade
The Stens 300-121RT-STN is a universal 3-in-1 blade designed to fit a broad spectrum of walk-behind mowers with a 21-inch deck. It serves as a replacement for many brands, including Bolens, Craftsman, Huskee, and MTD. This universal fit makes it a practical option if you are unsure of the specific OEM part number or own an older mower model.
As a 3-in-1 blade, it provides the flexibility to bag, side-discharge, or mulch your grass clippings based on your preference or seasonal lawn care needs. The blade is built to meet or exceed original equipment specifications, ensuring a reliable cut and consistent performance. It is a solid, all-purpose choice for general lawn maintenance.
KEDAKEJI Lawn Mower Blades 21″
This mulching blade from KEDAKEJI is designed to replace OEM numbers like 942-0741 and 742-04100. It is compatible with a long list of Troy-Bilt models, including the TB110, TB130, TB200, and TB230, as well as several Cub Cadet and Craftsman mowers. The extensive compatibility list makes it a versatile option for many homeowners.
The blade is engineered to provide an efficient mulching action. By finely chopping grass clippings and returning them to the lawn, it helps to conserve moisture and provide natural nutrients. This process can lead to a reduction in the need for additional fertilizers and promotes a greener, healthier lawn over time.
GYZJ Lawn Mower Blades
Available in a two-pack, these GYZJ blades are made to replace part numbers 165833, 175064, and 406712, among others. They fit a wide array of Craftsman, Husqvarna, and Poulan 21-inch mowers, such as the Craftsman 917375940 and Husqvarna 5521RSX. The pack of two is ideal for ensuring you always have a sharp blade ready for use.
The blades feature a round center hole and precise dimensions to ensure a correct fit and balanced operation on compatible mowers. Proper installation is key for safety and performance, so remember to wear protective gloves when replacing the blade. A balanced blade helps maintain your mower’s vibration levels and contributes to a cleaner cut.
Oregon 3 Pack 96-382 Gator G3 Blade
Oregon is a trusted name in outdoor power equipment components, and this three-pack of Gator G3 blades offers great value. While the cutting length is 17-1/2 inches, it is included for users whose specific Craftsman or other mower models require this size. The high-lift design features an aggressive blade angle to improve air flow under the mower deck.
This enhanced air flow is particularly beneficial for bagging or side-discharging, as it effectively lifts grass for a clean cut and efficient removal. The Gator Mulcher feature also allows for effective mulching when desired, providing versatility. The cleaner cutting performance can lead to a more manicured lawn appearance and may reduce how often you need to empty the bag.
8TEN LawnRAZOR High Lift Blade
The 8TEN LawnRAZOR blade is a high-lift option designed for mowers with a 21-inch deck from brands like MTD, Cub Cadet, and Troy-Bilt. It replaces part numbers such as 742-0641 and 942-0641. This blade is an excellent fit for models including the Troy-Bilt Tuff-Cut 220 and various Craftsman walk-behind mowers.
The high-lift design creates strong suction, which stands grass up straight before cutting for a more even and clean finish. This powerful air flow is also highly effective for bagging, as it ensures clippings are efficiently carried into the bag, reducing clumping and the frequency of stops to empty it. It is a strong performer for those who prioritize a striping effect and superior bagging performance.
Maxpower 331981B Universal Gold Mulching Blade
The Maxpower 331981B is a commercial-grade mulching blade known for its durability and universal fit. The blade’s gold coating is not just for show; it provides an extra layer of corrosion resistance, which can extend the blade’s life. Its universal design aims to fit most 21-inch mowers, making it a widely applicable choice.
This product stands out because it includes a comprehensive set of installation hardware. The package comes with a cover washer and six reducing washers in various sizes, which greatly increases the likelihood of a secure and proper fit on many different mower spindles. This attention to detail simplifies the installation process and provides added value.
Arnold Universal 21-Inch 3-in-1 Mulching Blade
Arnold offers this universal 21-inch blade that provides the flexibility to bag, mulch, or side-discharge clippings. It is engineered to fit a majority of walk-behind mowers, offering a straightforward replacement solution without the need to cross-reference numerous part numbers. This makes it a convenient go-to option for many.
Like other high-quality universal blades, it includes sizing washers and a cover washer to help achieve a proper and secure fit on various mower models. The 3-in-1 functionality allows you to adapt your mowing style to the condition of your lawn, whether you want to collect clippings, mulch for lawn health, or quickly discharge while cutting overgrown grass.
Oregon 96-397 Gator G5 High-Lift Lawn Mower Blade
While a specific ASIN was not provided, the Oregon Gator G5 is a premium blade worth considering for compatible Craftsman mowers. Oregon’s G5 blade is the next generation in their lineup, designed for enhanced performance and durability. It typically incorporates advanced features for superior cutting and mulching.
This blade often includes laser-cut, sharpened ends for a precise cut and a reinforced spine for increased strength and a longer service life. The high-lift design promotes excellent air flow for effective bagging and discharge, while its advanced geometry also supports efficient mulching. For those seeking a top-tier replacement from a leading brand, the Gator G5 is a compelling option.
What to Look For in a Craftsman 21″ Lawn Mower Blade Replacement
Finding the right replacement blade for my Craftsman 21″ mower is more than just matching the size. I’ve learned that a few key factors make the difference between a decent cut and a fantastic one. The first thing I always check is the exact model number of my mower. This isn’t just a suggestion; it’s essential. Craftsman has made many different 21″ mowers over the years, and a blade that fits one might not fit another, even if the deck size is the same. I find the model number on a sticker under the seat or on the mower deck itself. Once I have that, I can cross-reference it with the blade manufacturer’s compatibility charts to be sure I’m getting the correct part.
Next, I think about the type of blade. The standard choice is a simple, all-purpose mulching blade. This is what usually comes on the mower from the factory. It’s designed to cut the grass and then recut the clippings into fine particles that decompose quickly back into the lawn. If I’m dealing with a lot of leaves in the fall or I just want to avoid bagging, a dedicated mulching blade with more curved fins can do an even better job. For a super clean, striped look, I sometimes use a high-lift blade. These are designed to create a stronger updraft, which stands the grass blades upright for a cleaner cut and helps funnel clippings into a bag more efficiently. They’re great for bagging but can be a bit noisier and use more power.
Finally, the material and build quality matter a lot. I look for blades made from high-carbon steel, as they hold a sharp edge longer and are more resistant to the impacts that happen when I accidentally hit a rock or a tree root. Some blades come with a corrosion-resistant coating or finish, which is a nice bonus for extending the blade’s life, especially if I don’t always get around to cleaning it perfectly after each use. A proper balance is non-negotiable. An unbalanced blade causes vibration that can wear out the mower’s spindle bearings. Reputable brands ensure their blades are balanced from the factory, but it’s a good habit to check it myself before installation.
FAQ
How often should I replace my Craftsman 21″ mower blade?
I don’t follow a strict timeline; I go by condition. Generally, I sharpen my blade a couple of times during the mowing season. I consider a full replacement when the blade has significant nicks that can’t be sharpened out, the cutting edge is visibly worn down and thin, or it’s become bent from an impact. For an average-sized lawn, a single blade might last me two to three seasons, but if you hit debris often or have a very large yard, you might need to replace it annually.
Can I use a non-Craftsman brand blade on my mower?
Absolutely. As long as the blade is specifically listed as compatible with your Craftsman mower’s model number, third-party brands are a great option. Companies like Oregon and MaxPower make excellent quality replacement blades that often cost less than the OEM (Original Equipment Manufacturer) part. The key is that verification of fit, not the brand name on the blade itself.
What’s the difference between a mulching blade and a high-lift blade?
This is a common question I had when I started. A mulching blade is typically more curved and is designed to keep the grass clippings suspended under the deck longer, chopping them into tiny pieces that disappear into the lawn. A high-lift blade has more pronounced wings on the ends that create a powerful upward airflow. This is best for bagging grass or for discharging clippings to the side, and it gives a very clean cut. Some blades are a hybrid, offering a balance of both functions.
Is it difficult to change the blade myself?
It’s one of the easier DIY maintenance tasks. The most important step is safety: always disconnect the spark plug wire to prevent the engine from accidentally starting. I tip the mower on its side with the air filter and carburetor facing up. Then, I use a block of wood to wedge the blade so it doesn’t spin, and I use a long wrench or socket to loosen the center bolt (it’s usually torqued on pretty tight). I make a note of which side of the blade faces the deck when I take the old one off so I can install the new one the same way.
What happens if I run my mower with a dull or damaged blade?
I try to avoid this because it causes several problems. A dull blade doesn’t cut the grass; it tears it, leaving ragged, brown tips that make the whole lawn look dull and can make the grass more susceptible to disease. It also puts more strain on the mower’s engine, and an unbalanced or bent blade can cause vibrations that damage the spindle assembly, which is a much more expensive repair than a simple blade replacement.