A well-manicured lawn doesn’t just happen—it’s the result of using the right equipment, and one of the most overlooked yet crucial components is the lawn mower blade. For homeowners and professionals who want a healthy, lush yard, a 20-inch mulching blade can make all the difference. Unlike standard blades that discharge clippings, mulching blades finely chop grass and redistribute it back into the soil as a natural fertilizer.
If you’re shopping for the best 20 inch mulching blade, you may have noticed there are dozens of options on the market, each claiming superior cutting performance and durability. This guide breaks it all down: what mulching blades do, key buying factors, and unbiased product reviews of the top five blades available now.
Top 5 Best 20 Inch Mulching Blades
Below are detailed reviews of the best-performing mulching blades, including key features, pros, and cons to help you choose the right one.
What Do Mulching Blades Do?
Mulching blades, often referred to as “3-in-1 blades”, serve three purposes: bagging, discharging, and mulching. Their design differs from standard mower blades:
- Curved edges & extra cutting surfaces – These help lift, cut, and recut grass clippings multiple times before dropping them onto the lawn.
- Finer clippings – Smaller pieces decompose faster, enriching the soil with nitrogen, phosphorus, and potassium.
- Reduced yard waste – Instead of bagging clippings or raking, mulching blades recycle nutrients directly back into your lawn.
The result is healthier grass, less work, and an eco-friendlier mowing process.
Key Factors to Consider When Buying a 20-Inch Mulching Blade
Choosing the best 20 inch mulching blade isn’t just about grabbing the first one you see online or at a hardware store. The blade is the heart of your mower’s cutting system, and the wrong choice can lead to uneven cuts, wasted fuel, excessive vibration, or even mower damage.
To make an informed decision, you need to weigh multiple factors such as compatibility, blade design, durability, and overall value. Below, we break down each consideration in detail to help you find the best mulching blade for your lawn care needs.
Compatibility
Compatibility should be your very first checkpoint. Even the most durable, high-performing blade is useless if it doesn’t fit your mower.
- Exact Length: For this guide, you’ll want a blade that measures precisely 20 inches. A blade that’s even half an inch too long may hit the mower deck, while a shorter blade will leave strips of uncut grass.
- Mounting Hole Patterns: Mowers use different center-hole configurations to secure blades. Common types include the 5-point star, 6-point star, round hole, and bow-tie pattern. Choosing the wrong one means the blade won’t mount securely, which is both inefficient and unsafe.
- Brand-Specific Requirements: Some mower brands, like MTD, Cub Cadet, and Craftsman, design blades with proprietary mounting systems. If you own one of these, OEM blades may save you the hassle of guessing.
Pro Tip: Always check your mower’s manual or the old blade before buying a replacement.
Blade Design
Not all mulching blades are created equal. The design you choose should reflect how you mow and what results you expect.
- Standard Mulching Blades: Also known as “3-in-1 blades,” these offer a balanced mix of mulching, bagging, and side discharge. They’re great if you like versatility and don’t want to commit to one mowing style.
- High-Lift Mulching Blades: These blades have steeper curves and a more aggressive angle, generating stronger airflow. They’re ideal for those who bag grass clippings frequently, since the extra lift helps move cuttings into the collection bag.
- Gator Blades: Recognizable by their serrated, “alligator-like” edges, these are designed for ultra-fine mulching. They’re especially effective for shredding leaves in the fall and returning nutrient-rich material to your soil.
Choosing the right design can improve efficiency, reduce mowing time, and enhance lawn appearance.
Material & Durability
A blade’s material determines how long it will last and how well it performs under tough conditions.
- High-Carbon Steel: Most quality mulching blades are made from hardened or heat-treated high-carbon steel. This type of metal resists bending, chipping, and premature wear, even when exposed to thick grass or light debris.
- Coatings & Finishes: Some blades feature powder-coated finishes or anti-rust coatings. These don’t just make the blade look polished—they help prevent corrosion and extend the life of the blade, especially if you mow in damp conditions.
- Thickness: Heavier, thicker blades are often more durable, but they can add stress to smaller mower engines. Balance is key—choose a blade that matches your mower’s power level.
If you mow often or deal with challenging yard conditions, prioritize durability over price.
Ease of Installation
Nobody wants to spend hours struggling with adapters or re-checking instructions. Installation is a key consideration when buying a replacement blade.
- OEM Blades (Original Equipment Manufacturer): These blades are designed specifically for your mower brand and model. They typically fit perfectly without additional parts or adjustments.
- Universal-Fit Blades: These come with multiple washers or adapters to fit different mounting hole types. While versatile, they sometimes require more effort to balance correctly, and improper installation can lead to vibration issues.
If you’re new to mower maintenance, OEM blades may save you frustration, while seasoned DIYers might find universal options a good budget-friendly solution.
Performance & Sharpness
At the end of the day, the point of a mulching blade is to cut grass cleanly and efficiently.
- Sharpness: A sharper blade slices through grass instead of tearing it. This not only improves the lawn’s appearance but also helps grass heal faster, reducing the risk of disease.
- Edge Retention: Some blades hold their sharp edge longer than others, meaning fewer sharpening sessions. Hardened steel generally performs better in this area.
- Mulching Efficiency: The design of the cutting edge, along with the curvature of the blade, determines how effectively it chops grass into fine clippings. Blades with specialized teeth (like Gator blades) often excel at mulching.
For the best results, inspect your blade’s edge regularly and sharpen it every 8–10 hours of mowing.
Price & Value
Finally, your budget plays a role in your decision. But remember—price isn’t the only indicator of value.
- Budget Blades: Ideal for homeowners who mow small lawns occasionally. These blades may need more frequent sharpening or replacement, but they’re affordable.
- Mid-Range Options: These often strike the best balance between cost and performance. They’re durable enough for regular use without the premium price tag of OEM blades.
- Premium or OEM Blades: More expensive upfront, but they typically last longer, fit better, and deliver superior mulching results. Over time, they can actually save money by reducing replacement frequency.
Think of a mulching blade as an investment in your lawn. Spending a little more up front can save time, effort, and frustration later.
Final Thoughts on Buying a 20-Inch Mulching Blade
The best 20 inch mulching blade for you depends on your mower model, lawn conditions, and mowing habits. Prioritize compatibility and design, then weigh durability, installation ease, and cost to make the right choice.
Whether you choose a reliable OEM blade or a budget-friendly universal option, selecting carefully ensures cleaner cuts, healthier grass, and a better mowing experience overall.
MTD Genuine Parts 20-Inch Mulching Blade
The MTD Genuine Parts 20-Inch Mulching Blade is designed specifically for select Troy-Bilt, Yard Machines, and Bolens mowers. Made from OEM-grade steel, it ensures a precise fit and optimal mulching performance.
Its curved design allows grass clippings to be cut and recirculated multiple times, providing fine mulch that decomposes quickly. This blade stands out because it’s an original replacement part, guaranteeing exact compatibility without modification. If you want reliability, OEM is the safest choice.
Key Features:
- OEM-quality replacement for MTD family mowers.
- Heavy-duty steel construction.
- Curved edges for efficient mulching.
Pros
- Perfect OEM fit—no adapters needed.
- Reliable cutting consistency.
- Durable material.
Cons
- Limited compatibility (not universal).
- Pricier than aftermarket alternatives.
8TEN LawnRAZOR 20-Inch Mulching Blade
The 8TEN LawnRAZOR is built for durability and precision, compatible with Craftsman, Husqvarna, and Poulan mowers. Its hardened steel construction ensures long-lasting sharpness, while the aerodynamic design maximizes airflow for efficient mulching. This blade offers great value as a strong aftermarket replacement for OEM blades.
Key Features
- Premium hardened steel.
- Compatible with Craftsman & Husqvarna mowers.
- Smooth airflow for improved mulching.
Pros
- Affordable alternative to OEM.
- Stays sharp longer than standard blades.
- Good balance reduces mower vibration.
Cons
- Requires checking mower compatibility carefully.
- May need frequent sharpening if used in rocky yards.
Maxpower 331980S Universal 20-Inch Mulching Blade
The Maxpower 331980S is a universal-fit mulching blade that works with a wide variety of mower brands. Designed with multiple mounting hole adapters, it fits most 20-inch mowers.
Its sharp cutting edge and curved design make it effective for mulching, while the budget-friendly price makes it appealing for homeowners.
Key Features
- Universal fit with included washers/adapters.
- Heat-treated steel for durability.
- 20-inch cutting width.
Pros
- Fits multiple mower models.
- Cost-effective replacement option.
- Easy installation with adapters.
Cons
- Not as heavy-duty as OEM blades.
- Balance may vary slightly across different mowers.
Upgrade 355-101 Heavy-Duty 20-Inch Mulching Blade
The Upgrade 355-101 Mulching Blade is built thicker than many standard blades, offering enhanced durability for rough mowing conditions.
Its design ensures excellent mulching efficiency while being tough enough to withstand small debris. Best suited for users who mow frequently or in rugged areas.
Key Features
- Extra-thick steel construction.
- Enhanced mulching teeth for finer cuts.
- Rust-resistant coating.
Pros
- Superior durability for tough conditions.
- Stays sharper for longer periods.
- Handles heavy grass well.
Cons
- A heavier weight may stress smaller mowers.
- Limited brand compatibility.
Youxmoto 20-Inch Replacement Mulching Blade
The Youxmoto replacement mulching blade is designed for Craftsman, MTD, and Cub Cadet mowers. Known for its precise fit and efficient mulching action, this blade offers an excellent balance between price and performance. It’s a reliable option for those who want an affordable yet effective OEM-style replacement.
Key Features
- Compatible with Craftsman, Cub Cadet & MTD.
- Precision-machined for balance.
- 20-inch cutting path.
Pros
- Affordable OEM-style option.
- Good balance reduces mower strain.
- Clean, even mulching performance.
Cons
- Not as long-lasting as premium OEM blades.
- Requires more frequent sharpening with heavy use.
Frequently Asked Questions About 20-Inch Mulching Blades
How often should I replace my mulching blade?
Mulching blades, like any cutting tool, wear down over time. A dull, bent, or chipped blade not only delivers poor results but can also damage your mower’s engine by causing imbalance and vibration. As a rule of thumb, most homeowners should replace their mulching blade at least once per mowing season or after about 25–30 hours of cutting time.
However, replacement frequency depends on several factors:
- Lawn size: Larger lawns naturally cause more wear, requiring more frequent replacement.
- Grass type: Thick or coarse grasses dull blades faster than soft, fine grasses.
- Debris in the yard: If your mower frequently hits sticks, rocks, or roots, blades can become damaged much quicker.
- Usage frequency: Weekly mowing puts less strain on a blade than daily or commercial use.
A good rule is to inspect your blade every few mowings. If you notice ragged, torn grass tips instead of clean cuts—or if the mower vibrates unusually—those are strong signs it’s time to sharpen or replace the blade.
Can I sharpen mulching blades?
Yes, mulching blades are designed to be sharpened multiple times before replacement. A sharp blade cuts grass cleanly, which helps the lawn heal faster and improves mulching performance. Dull blades, on the other hand, tear grass blades, leaving brown edges and making your lawn more susceptible to disease.
When sharpening mulching blades:
- Maintain the correct angle: Most mulching blades have a cutting angle between 30° and 45°. Stick to the factory angle for best results.
- Balance the blade: After sharpening, ensure both sides are evenly ground. An unbalanced blade can damage the mower’s spindle and bearings.
- Use the right tools: Options include a hand file, bench grinder, or dedicated blade sharpener. Manual filing is precise, but grinders are faster for heavily worn blades.
- Don’t oversharpen: Over-thinning the blade reduces strength, increasing the risk of chips and cracks.
If your blade has deep nicks, cracks, or bends, sharpening won’t help—replacement is the safer option.
Do mulching blades work in wet grass?
Mulching blades can technically cut wet grass, but performance suffers significantly. Wet grass tends to clump together, sticking under the mower deck instead of circulating properly. Since mulching relies on airflow and repeated chopping of clippings, moisture interferes with the process.
Problems you may notice when mulching in wet conditions:
- Clumping: Instead of fine clippings, you’ll get clumps that sit on the lawn, potentially smothering the grass underneath.
- Uneven cut: Wet grass bends down under the mower rather than standing upright, resulting in patchy mowing.
- Deck buildup: Wet clippings stick to the underside of the deck, requiring frequent cleaning and potentially rusting the metal.
For best results, always mow when the grass is dry. If you must mow damp grass, raise the cutting height, slow your mowing pace, and clean the deck afterward.
Are universal blades as good as OEM blades?
This is a common question for homeowners trying to balance cost and performance. Universal blades are designed to fit a wide range of mower brands and models. They often come with adapter washers to match different mounting hole patterns. On the other hand, OEM (Original Equipment Manufacturer) blades are made by or for the mower brand, ensuring a perfect fit.
Universal blades:
- Pros: Affordable, widely available, flexible fit.
- Cons: May not match the exact specifications of your mower, potentially reducing efficiency or causing vibration.
OEM blades:
- Pros: Perfect fit, consistent balance, and often better durability.
- Cons: More expensive, limited to specific mower models.
If you mow a small yard occasionally, a universal blade may be sufficient. But if you mow frequently or professionally, OEM blades usually deliver better long-term performance.
Will a mulching blade fit any mower?
Not necessarily. While universal-fit blades exist, not every mower can accept a mulching blade. Before purchasing, check three key specifications:
- Blade length: The most critical factor—using a blade longer than your mower deck can be dangerous, while a shorter blade won’t cut evenly. For this guide, you’re looking for a 20-inch blade.
- Mounting hole type: Mowers use different attachment systems, such as a 5-point star, 6-point star, round hole, or bow-tie design. A mismatch means the blade won’t mount securely.
- Deck design: Not all mower decks are optimized for mulching. Some are designed primarily for bagging or side discharge. While you can install a mulching blade, you may also need a mulching kit (including a cover plate) for best results.
Always consult your mower’s manual before purchasing. If you’re unsure, OEM blades are the safest choice since they are specifically designed for your mower model.
Do mulching blades work on leaves?
Yes, mulching blades work very well on leaves. In fact, many homeowners prefer mulching blades for fall cleanup because their curved design and extra cutting surfaces chop leaves into tiny pieces.
Instead of raking or bagging, the finely shredded leaves decompose quickly, enriching the soil with organic matter and nutrients like nitrogen and potassium. This natural mulch helps retain soil moisture, regulate temperature, and improve lawn health.
However, effectiveness depends on conditions. Mulching blades handle light to moderate leaf coverage best. If your lawn is buried under thick, wet leaves, you may need to make multiple passes or remove some leaves first to prevent clumping.
For best results, mow when leaves are dry, and keep the blade sharp for efficient shredding. Overall, mulching blades provide an eco-friendly and time-saving solution for managing leaves while reducing yard waste.
Conclusion
A high-quality 20-inch mulching blade is one of the best investments you can make for your lawn’s health and appearance. From the reliable OEM MTD Genuine Parts blade to the affordable Maxpower universal option, each of the products reviewed here has unique advantages.
If you want exact compatibility and durability, stick with OEM blades. For budget-conscious buyers, universal or aftermarket options like Maxpower or 8TEN offer excellent value.
By choosing the right mulching blade, you’ll not only keep your lawn neat but also enrich the soil naturally—making your mowing routine both efficient and eco-friendly.
