Mulching mower blades help finely chop grass clippings, return nutrients to the lawn, and improve overall mowing performance. This guide reviews five highly compatible options for 21-inch walk-behind mowers and similar Troy-Bilt, Cub Cadet, Craftsman, and MTD models. Each product section includes fit notes, material details, and typical use cases to help you choose a blade that maximizes mulching efficiency and durability. All selections emphasize compatibility with common 21″ mowers and are designed to fit 20- to 21-inch deck configurations.
Summary of selected products
| Product | Brand | Key Fit | Notes |
|---|---|---|---|
| Grasscool TB110 Mulching Blade | Grasscool | Troy-Bilt TB110 and 21″ decks | |
| Maxpower 331528B Mulching Blade | Maxpower | 21″ Decks including MTD/Cub Cadet/Troy-Bilt | |
| MaxPower 561811XB 2-Blade Set | Maxpower | 42″ John Deere mowers (for reference); included as mulching option | Two blades; note size differs from 21″ deck parts but demonstrates mulching capability. |
| MTD Genuine Parts Mulching Blade | MTD Genuine Parts | 20″ walk-behind mowers (1997 and after) | 3-in-1 blade mulches; broad compatibility with MTD family. |
| MaxPower 331981B Universal Mulching Blade | Maxpower | 21″ universal blade with adapters included | Includes washers and adapters for multiple center hole sizes. |
Grasscool Tb110 Mulching Blade For Troy-Bilt
The Grasscool TB110 mulching blade is designed for 21-inch Troy-Bilt walk-behind mowers, including TB110 and TB240/ TB230 lines. Noted compatibility covers a wide range of OEM part numbers such as 942-0741A and 742-0741A, making replacements straightforward for several 21″ decks. Specifications specify a length of 20 7/8 inches, width of 2-1/4 inches, and a thickness of 9/64 inch, with a bow-tie center hole. The blade is oriented to mulch by breaking clippings into finer particles that decompose more quickly. Use in standard mowing conditions where clippings are moderate in volume.
Features to consider: mulching blade design, confirmed fit with 21″ deck models, and broad OEM number coverage. This blade is a practical option if you own Troy-Bilt models listed in the compatibility notes. Be sure to verify the center hole style and lift height for optimal performance on your deck.
Maxpower 331528B Mulching Blade
This Maxpower mulching blade is built to fit many 21-inch mowers, including those from MTD, Cub Cadet, Troy-Bilt, and Craftsman. The product listing emphasizes matching the current OEM blade number to ensure exact replacement, with replacements matching numbers such as 742-0741 and 942-0741. The blade set is designed for 21″ decks and includes detailed OEM cross-refs, ensuring broad compatibility across several manufacturers. The blade is engineered to mulch efficiently while maintaining cutting performance in typical residential conditions.
When selecting this blade, confirm the mower model series against the listed OEM numbers and the 21″ deck size. Proper mounting alignment and center hole compatibility are essential for safe operation and optimal mulching results.
MaxPower 561811XB 2-Blade Mulching Set
MaxPower’s 561811XB is a two-blade commercial mulching set noted for 42-inch John Deere mowers, serving as an example of a mulching blade system designed for heavy-duty use. While this 42″ option is larger than a typical 21″ deck, it demonstrates the flexibility and design approach used by MaxPower for mulching blades—two blades work together to grind clippings finely. For a 21″ deck, homeowners may look for a single-blade or compatible 21″ set within the same product family that matches the mounting pattern and center hole specifications.
Key considerations include blade size, mounting compatibility, and the ability to maintain mulching performance during high-clipping loads. Always cross-check the mower model and deck width before purchasing a replacement blade set.
MTD Genuine Parts Mulching Blade
MTD Genuine Parts offer a 3-in-1 mulching blade designed for 20-inch walk-behind mowers from 1997 onward. The blade is compatible with various MTD Gold, Yard Machines, Troy-Bilt, Bolens, White Outdoor, and Huskee products, making it a broad replacement option for several 20″ and compatible 21″ decks. The feature set emphasizes three-in-one functionality, allowing mulching, bagging, or side discharge depending on the mower’s configuration. This makes it a versatile choice for homeowners who want flexibility in lawn maintenance.
Important fit notes: verify deck size and mounting pattern, as some MTD sub-brands use different blade designs. The 20″ designation is common in older or slightly smaller deck models, so ensure model compatibility before purchasing.
MaxPower 331981B 21-Inch Universal Mulching Blade
MaxPower’s 331981B is presented as a universal 21-inch mulching blade, designed to fit a variety of mowers with a standard 1-inch center hole and 21″ length. The package includes a cover washer and multiple washers in varying sizes to accommodate different mounting configurations. This versatility helps homeowners adapt the blade to different mower brands without sacrificing mulching performance. It is a practical option when exact OEM numbers are not readily available or the mower brand uses a similar 21″ deck standard.
Buyers should check the center hole diameter, mounting pattern, and lift height for each mower to ensure optimal cutting efficiency. Using the included washers can help achieve precise alignment and prevent vibration during operation.
2 Pack Lawn Mower Mulching Blade 21″
This two-pack from A ABIGAIL provides forged blades made from heat-treated 65Mn manganese steel with rust-resistant coating. The blades replace multiple OEM numbers for Troy-Bilt, Cub Cadet, Craftsman, and MTD, offering a reliable option when precision fit is needed. The blades are designed for 3-in-1 mulching capability and fit a broad range of Troy-Bilt TB110, TB240, TB230, TB130, TB200, and related 21″ deck mowers. The high-strength steel and protective coating contribute to longer life under demanding mowing conditions.
When selecting this option, confirm the OEM numbers and the mounting pattern to ensure a secure fit. The 3-in-1 capability means you can mulch, bag, or discharge depending on your mower’s configuration, enabling flexible lawn maintenance strategies.
Buying Guide: Key Purchase Considerations
- Deck size and model compatibility: Ensure the blade is designed for a 21-inch deck and matches your mower’s mounting pattern and center hole style.
- Blade type: Mulching blades are designed to finely mulch clippings; consider 3-in-1 blades if you need bagging or side discharge flexibility.
- OEM compatibility: If possible, verify OEM part numbers listed by the manufacturer to ensure a precise fit and optimal performance.
- Material and coating: Higher manganese steel or similarly tempered blades with rust-resistant coatings last longer under frequent mowing.
- Installation and maintenance: Confirm torque requirements and mounting hardware; check for proper lift and blade balance to minimize vibration.
- Cost vs. longevity: While price matters, prioritize blades with proven durability for your mowing frequency and lawn conditions.
Comparison at a glance: For Troy-Bilt and Cub Cadet 21″ decks, options from Grasscool and MaxPower offer broad OEM cross-refs and 21″ dimensions, while MTD Genuine Parts emphasize 3-in-1 functionality for older and newer 20″ to 21″ decks. Universal blades such as MaxPower 331981B provide flexibility when exact OEM numbers aren’t available, but may require careful mounting verification. Assess your mower’s deck size, mounting pattern, and preferred mulching performance to select the best blade.