A healthy, green lawn doesn’t just depend on watering and fertilization—it also relies on using the right mower blades. For homeowners and landscapers with riding mowers or lawn tractors, a 40-inch mulching blade set can make all the difference in lawn appearance, soil health, and long-term maintenance.
Mulching blades are designed with a unique curved edge that chops grass clippings multiple times before dropping them back onto the lawn. Instead of clumps, you’re left with fine particles that decompose quickly, feeding your soil with nitrogen and other essential nutrients. This reduces the need for chemical fertilizers, keeps your lawn tidy, and eliminates frequent bagging or disposal of grass clippings.
If you own a 40-inch cutting deck mower, you’ll most likely need two 20-inch mulching blades working in tandem. Choosing the right set is crucial, since not all blades fit all mowers. Compatibility, durability, and design directly affect your mower’s performance and your lawn’s finish.
In this guide, we’ll explore whether mulching blades help with striping, the key factors you should consider before buying, and the best 40 inch mulching blade—complete with detailed reviews, pros, and cons.
Top 5 Best 40 Inch Mulching Blades
Do Mulching Blades Stripe Better?
Lawn striping—the attractive alternating light and dark lines you often see on sports fields—is created by bending grass blades in different directions. This effect is influenced by:
- Airflow and suction from the blade
- Grass bending caused by mower deck baffles and rollers
- Light reflection on the bent blades of grass
Mulching blades differ from standard or high-lift blades because of their design. They feature a curved edge and multiple cutting surfaces, optimized for recutting clippings rather than generating maximum lift.
- High-Lift Blades: Provide the strongest suction, which stands grass upright and enhances striping dramatically. These are ideal if your priority is crisp, professional-looking stripes.
- Standard Blades: Offer moderate lift and cut cleanly, but don’t deliver as pronounced striping.
- Mulching Blades: Deliver a smooth cut with excellent clipping management. However, their airflow is more focused on keeping grass circulating inside the deck for multiple cuts, not on lifting grass high for striping.
Verdict: Mulching blades can create mild striping, but if sharp, defined lawn stripes are your top priority, high-lift blades are superior. That said, mulching blades give you the advantage of fertilization and a cleaner lawn appearance, making them the better all-around choice for most homeowners.
Key Factors to Consider When Buying a 40 Inch Mulching Blade
Selecting the best 40 inch mulching blade set isn’t just about size—it directly affects your mower’s performance, cut quality, and lawn health.
Since a 40-inch deck typically uses two 20-inch blades, attention to detail in compatibility, design, and durability is essential. Below are the most important considerations before making a purchase:
Compatibility
Compatibility is the first—and most critical—factor to check. Even small mismatches can lead to uneven cutting or deck damage.
- Exact Size: A 40-inch mower deck usually requires two 20-inch blades. Ensure both blades are precisely sized to avoid gaps or overlaps that cause scalping or missed patches.
- Mounting Hole Type: Mower blades attach to the spindle via mounting holes, which come in designs such as 5-point star, 6-point star, round, or bow-tie. Always check your mower’s manual for the exact specification.
- Brand Fit: Many mower brands like Troy-Bilt, MTD, Craftsman, Ariens, Gravely, and Murray have blades that correspond to specific OEM part numbers. While aftermarket options are widely available, make sure they list clear replacements for your brand and model.
Material & Durability
The blade’s material determines its strength, lifespan, and resistance to wear.
- Hardened Steel: Look for blades made from high-carbon, heat-treated steel, which resists bending and provides long-lasting sharpness.
- Protective Coatings: Powder-coated or rust-resistant finishes are especially beneficial if you mow damp grass frequently. These coatings reduce corrosion and prolong blade life.
- Thickness: Thicker blades (around 0.2 inches or more) provide durability and handle tough lawns better. However, keep in mind they require more engine power to maintain speed and mulching efficiency.
Blade Design
The shape and features of a mulching blade greatly influence cutting performance.
- Curved Edge: The signature feature of mulching blades, which keeps grass circulating under the deck for repeated cutting into fine clippings.
- Serrated vs. Smooth: Serrated blades are more aggressive, ideal for thick or overgrown lawns. Smooth-edged blades give a cleaner finish, making them better for routine maintenance.
- Lift Angle: A higher lift creates stronger airflow, which enhances bagging and striping but may reduce mulching efficiency. Moderate or low-lift designs are generally best for mulching-focused mowing.
Lawn & Grass Type
Not all lawns demand the same type of mulching blade.
- Thick, Lush Lawns: Require sturdy blades that won’t clog under heavy clipping loads.
- Wet or Damp Conditions: Blades designed with efficient airflow help minimize clumping when mowing slightly damp grass.
- Sandy or Dusty Soil: Lawns in abrasive environments wear blades faster. Choosing hardened, coated options ensures longer service life in these conditions.
Maintenance & Sharpening
Even the best mulching blades need routine care.
- Sharpening Frequency: Plan to sharpen blades every 20–25 hours of mowing or at least once per mowing season.
- Ease of Sharpening: Some blade designs are easier to sharpen than others. Serrated blades, for instance, require more precision, while smooth blades are simpler to maintain.
- Blade Balancing: Always balance blades after sharpening. Using a blade balancer tool helps prevent vibration, which reduces wear on the spindle and deck components.
Price vs. Value
Cost is always a factor, but long-term value is more important.
- OEM Blades: Usually more expensive, but they ensure perfect fit, tested performance, and peace of mind.
- Aftermarket Blades: More budget-friendly and often just as durable if sourced from a trusted manufacturer. Always check reviews and compatibility charts before purchasing.
Grasscool Mulching Blade for Troy-Bilt
The Grasscool mulching blade set is designed as a direct replacement for popular Troy-Bilt and MTD mower models. Built with high-quality steel and precision balance, these blades enhance mulching performance while maintaining smooth deck operation.
They measure 20 inches each, making them a perfect fit for 40-inch decks requiring two blades. Homeowners who want reliable cutting at an affordable price will find this option appealing.
Key Features
- Replaces OEM part numbers 942-0616A, 742 0616, 942 0616.
- High-carbon steel construction for durability.
- Designed for Troy-Bilt, MTD, Yard Machines, and Craftsman mowers.
- Mulching-focused curved design for finer clippings.
Pros
- Affordable compared to OEM parts.
- Strong build quality.
- Compatible with multiple mower brands.
- Smooth mulching performance.
Cons
- May require sharpening before first use.
- Not as long-lasting as premium OEM blades.
8TEN LawnRAZOR Mulching Blade
The 8TEN LawnRAZOR series is known for combining durability with precision cutting. This 20-inch blade set fits a wide range of MTD, Yard-Man, Murray, and Bolens mowers.
Each blade is engineered with a sharp edge and sturdy design to handle thick grass conditions. With aggressive cutting power and dependable performance, these blades are an excellent balance of price and quality.
Key Features
- Replaces MTD part 095103E701 and variations.
- Heavy-duty steel with powder-coated finish.
- Compatible with multiple mower brands and models.
- Sharp edge design improves grass recutting efficiency.
Pros
- Excellent fit for many mower models.
- High-quality steel construction.
- Stays sharp longer than many budget blades.
- Great value for money.
Cons
- Slightly heavier than OEM blades, requiring stronger engine power.
- Finish may wear faster in sandy soil.
Ariens / Gravely Genuine Mulching Blade
For those who prefer OEM reliability, the Ariens/Gravely Genuine Mulching Blade is a premium choice. Specifically designed for Ariens and Gravely mowers, these blades guarantee a perfect fit and performance.
The curved design ensures thorough mulching, while the durable construction promises long service life. If you value manufacturer-backed quality, this OEM blade is worth the higher price point.
Key Features
- OEM replacement part #00272800.
- Designed for Ariens and Gravely 40-inch deck mowers.
- Heavy-duty steel ensures long-term durability.
- Optimized mulching curve for clean and consistent cuts.
Pros
- Genuine OEM quality and fit.
- Excellent mulching efficiency.
- Long-lasting performance.
- Reliable brand reputation.
Cons
- Higher price compared to aftermarket alternatives.
- Limited compatibility with non-Ariens/Gravely models.
Oregon 2PK Mulching Blade
Oregon is a trusted name in mower parts, and this 2-pack of mulching blades lives up to its reputation. Designed as replacements for MTD part 95103E701, these blades are precision-engineered for superior mulching and long-lasting durability.
With sharp cutting edges and heat-treated steel, they are built to withstand tough mowing conditions while providing excellent results.
Key Features
- Replaces MTD 95103E701 and related models.
- Made from premium heat-treated steel.
- Advanced design ensures balanced rotation and reduced vibration.
- Pack includes two 20-inch blades.
Pros
- Trusted brand with strong quality control.
- Long lifespan with minimal sharpening needs.
- Reduced vibration during mowing.
- Excellent mulching performance.
Cons
- Slightly more expensive than budget options.
- May require initial sharpening for best performance.
MOTIVITY Mulching Blade
The mo blade set offers a cost-effective solution for homeowners needing reliable replacements for multiple MTD part numbers. These blades are crafted to provide efficient mulching with balanced cutting, helping reduce clumps and promote lawn health.
With a strong steel build and compatibility across several mower brands, MOTIVITY delivers good performance at a budget-friendly price.
Key Features
- Replaces multiple MTD OEM part numbers.
- Designed for 40-inch mower decks (20-inch per blade).
- Durable steel construction.
- Mulching-focused design with curved edges.
Pros
- Affordable option.
- Broad compatibility with several mower models.
- Decent mulching performance for regular lawns.
- Easy installation.
Cons
- Not as durable as Oregon or Ariens OEM blades.
- Requires more frequent sharpening.
FAQ Section: Mulching Blades Explained
Do mulching blades cut better than regular blades?
Yes, mulching blades typically cut better than standard blades, but it depends on what you mean by “better.” Standard mower blades are designed to make a clean, single cut and then discharge or bag the clippings. They provide a straightforward cut but don’t recirculate grass within the mower deck.
Mulching blades, on the other hand, are engineered with curved edges and extra cutting surfaces. This unique design allows them to keep grass circulating under the deck longer, chopping each blade of grass into very fine particles. The result is a cleaner appearance and clippings that decompose faster, feeding your soil with nutrients.
Another benefit is that mulching blades help reduce thatch buildup compared to standard blades because the clippings are much smaller and break down more quickly. However, if you mow very tall or wet grass, mulching blades may struggle more than high-lift blades. In summary, mulching blades cut “better” if you prioritize lawn health and reduced cleanup, but high-lift blades may outperform them in terms of striping and bagging efficiency.
Can you use mulching blades without a mulching kit?
Yes, you can install mulching blades on your mower without a mulching kit, but performance won’t be as effective. A mulching kit typically includes a mulching plug or cover that seals the discharge chute and deck baffles designed to improve airflow. These parts work with mulching blades to keep clippings circulating under the deck until they are finely chopped.
Without a kit, mulching blades will still cut grass into smaller pieces, but some clippings may escape through the discharge chute, leaving light clumping or uneven distribution. If you frequently mulch and want the best results, investing in a mulching kit is highly recommended. The kit ensures the mower deck has the right environment for blades to work at maximum efficiency.
That said, many homeowners still use mulching blades without kits, especially if their priority is reducing bagging rather than achieving the absolute finest mulch. Just be aware that the finish may not look as polished compared to a full mulching system.
Do mulching blades work in tall or wet grass?
Mulching blades can work in tall or wet grass, but their efficiency decreases under those conditions. These blades are designed to chop clippings into fine particles, which requires dry grass and optimal airflow.
When mowing tall grass, the mower has to process a larger volume of material at once, which can overwhelm the mulching design. This often leads to clumping or clogging under the deck. Similarly, wet grass is heavier and sticks together, making it harder for the blades to chop cleanly and distribute evenly.
To get the best performance:
- Try to mow more frequently so the grass doesn’t become overly tall.
- Avoid mowing right after rain or early in the morning when dew is present.
- If you must mow wet grass, raise the deck height to reduce the cutting load.
- Make a second pass if necessary to redistribute clippings more evenly.
In short, mulching blades work best in dry, moderately short grass. They can still function in tall or wet grass, but expect more cleanup afterward.
How often should you sharpen mulching blades?
A general rule of thumb is to sharpen mulching blades every 20–25 hours of mowing. For most homeowners, this translates to once or twice per mowing season, depending on lawn size and frequency of mowing.
Why sharpening matters:
- Dull blades tear grass instead of cutting it cleanly. This not only makes your lawn look ragged but also stresses the grass, making it more susceptible to disease.
- Mulching blades rely on sharp edges to chop clippings into fine pieces. A dull edge reduces mulching efficiency and increases clumping.
Other factors affect sharpening frequency:
- Sandy soil or lawns with debris (sticks, rocks) dull blades faster.
- Wet mowing conditions can also wear down edges quickly.
- If you mow commercially, blades should be sharpened more often than for residential use.
When sharpening, make sure the blades are also balanced. An unbalanced blade can cause vibrations that wear out your mower’s spindle and deck prematurely.
Are mulching blades worth it compared to bagging?
For most homeowners, mulching blades are absolutely worth it. They provide multiple advantages over bagging:
- Nutrient recycling: Clippings decompose quickly, returning nitrogen, potassium, and phosphorus back into the soil naturally.
- Time savings: No need to stop and empty grass bags.
- Environmental benefit: Less yard waste ends up in landfills.
- Cost efficiency: Reduces or eliminates the need for synthetic fertilizers.
However, bagging does have its place. If you’re mowing after a long break and the grass is very tall, bagging may be more efficient to avoid clumps. Some homeowners also prefer bagging for a perfectly clean, debris-free lawn, especially during leaf season.
Ultimately, mulching blades are the better choice for everyday mowing because they improve lawn health and sustainability. Bagging is best reserved for situations where you want a spotless finish or need to remove excess clippings.
Conclusion
Choosing the best 40 inch mulching blade is all about finding the right balance of compatibility, durability, and performance. If you’re after OEM reliability, the Ariens/Gravely 00272800 is a solid investment.
For budget-conscious buyers, MOTIVITY and Grasscool offer dependable performance at a lower price point. If you want the best mix of quality and value, the Oregon 2PK mulching blade stands out with its durability and trusted reputation.
No matter which option you choose, proper maintenance—regular sharpening, balancing, and cleaning—will ensure your blades last longer and deliver the best results. With the right set of 40-inch mulching blades, your mower will not only keep your lawn neat but also contribute to a healthier, greener yard.
