10 Best 21 Inch Mulching Blade 2025 in the United States

The MTD Genuine Parts 21-inch Mulching Blade is specifically designed to fit lawn mowers manufactured from 1995 onwards, making it a suitable choice for those with older models. The blade is compatible with various top mower brands, including Troy-Bilt, MTD, and Yard Machines, offering flexibility and convenience for users with different equipment.

Its 3-in-1 functionality allows for mulching, bagging, and side discharge, providing comprehensive options for managing grass clippings based on personal preferences and lawn care needs. The star-shaped center hole design ensures a secure fit, simplifying installation and removal during maintenance or blade replacement.

Constructed with durability in mind, this blade can serve as a direct replacement for several specific models, making it a reliable choice without compromising fit or function. While the blade is designed for compatibility with many mowers, users should still verify specific model compatibility to avoid any potential issues. Additionally, the blade's natural finish may not offer the same rust resistance as coated options, potentially affecting longevity.

The MaxPower 331737B mulching blade is designed for 21-inch cutting decks and fits a wide range of popular mower brands like Craftsman, Husqvarna, and Poulan, making it a versatile replacement option. It is made in the USA and built to meet or exceed original equipment manufacturer (OEM) standards, which suggests solid durability and reliable performance. The blade features a 5/8-inch center hole, ensuring it fits securely on compatible mowers. Its construction material and finish are designed to resist wear and corrosion, which is important for enduring typical lawn conditions. The blade thickness and design promote effective mulching, helping to finely cut grass clippings for better lawn health.

One of its strong points is the broad compatibility with many OEM numbers, so it’s easy for users to check if this blade matches their mower. The blade’s weight and dimensions might be slightly bulkier than some OEM blades, which could affect balance if not perfectly matched. Also, since it’s a universal replacement, it may not offer the exact optimized fit or cutting edge shape of some brand-specific blades. This blade is best for lawn owners who want a reliable, well-constructed mulching blade that works with many 21-inch decks and value quality without paying a premium for brand-specific parts.

The Grasscool 21 Inch Mulching Blade offers strong compatibility with several Troy Bilt, MTD, Cub Cadet, and Craftsman lawn mowers, making it a versatile choice for many users. Its 21-inch length and 9/64-inch thickness are suitable for robust mowing tasks, including cutting overgrown weeds and rugged terrain. The blade's design features curves that enhance mulching, bagging, and side discharging, recycling grass clippings back into the soil as nutrients for healthier lawn growth.

It boasts a high-lift design that significantly increases bagging capacity and reduces clogging, which can improve mowing efficiency. Additionally, the blade undergoes rigorous testing to ensure superior performance, including hardness, balance, and field tests. However, it's crucial to check the center hole pattern (Bow Tie spindle) for compatibility to avoid installation issues, and the painted cutting edges will wear off during mowing, which might require sharpening for a neat cut.

The blade has a strong finish to prevent rust and protect hands during installation, although this coating will diminish over time. Users should ensure it matches their mower’s spindle type to avoid complications.