10 Best 21 Inch Mulching Blade 2026 in the United States

The UDC Parts 942-0741A is a 21-inch mulching blade designed as a direct replacement for many popular lawn mower brands such as Troy Bilt, Craftsman, Cub Cadet, and others. Its 21-inch length and 2-1/4 inch width make it a standard fit for 21-inch decks, ensuring good coverage of the mowing area. The blade is made to match original equipment manufacturer (OEM) specifications, which means it fits precisely and maintains the mower's performance. It features a bow-tie center hole and side holes that align with various models, making it highly versatile for different mower types. The blade is pre-sharpened and coated with a safety paint that wears off during initial use, helping to protect the blade during handling and shipping. Users can resharpen the blade when needed to maintain cutting efficiency. The mulching design helps finely chop grass clippings, which can improve lawn health by returning nutrients to the soil.

This blade holds a strong customer rating of 4.6 out of 5, indicating reliable performance and satisfaction. It is best suited for homeowners who want a cost-effective, OEM-compatible replacement that maintains their mower’s mulching ability without fuss.

The EGO POWER+ 21" Mulching Blades are designed specifically for use with EGO's 56-volt cordless lawn mowers, ensuring excellent compatibility and fit. Made from all-steel, these blades are built for heavy-duty mulching and bagging, offering a clean and precise cut that helps promote a healthy lawn. Their design integrates with the Select Cut Multi-Blade System, allowing an interchangeable lower blade which adds versatility. The blades measure approximately 20 inches in length with a sturdy thickness, contributing to their durability during regular use. A notable strength is that they are genuine parts from EGO, which means they meet quality standards and maintain mower performance.

The package does not include nuts and bolts, so you will need to have these on hand or purchase them separately. Users rate these blades highly, with a strong 4.7-star average based on over 800 reviews, reflecting satisfaction in performance and build. The blades weigh about 2.6 pounds each, a reasonable weight for handling and installation.

If you own one of the compatible EGO mower models and want reliable replacement or upgraded mulching blades, these offer a solid choice thanks to their robust construction and mower-specific design. They may not fit other brands or models, so compatibility is key to consider. Also, if you prefer a blade that comes fully ready with all mounting hardware, you might need to source that separately here.

The Scag 3PK Genuine OEM 21" Cutter Mower Blades are designed to fit 61" mower decks and come as a set of three blades. Each blade measures 21 inches in length, which is standard for this size category, with a thickness of .203 inches, offering a good balance of strength and flexibility for mulching tasks. The blades have a 5/8" center hole, making them compatible with many Scag mower models, which is important if you want a perfect fit without modifications.

The blade width is 2 1/2", which helps with effective grass cutting and mulching by providing enough surface area to chop clippings finely. These blades are genuine OEM parts, so you can expect reliable quality and durability, backed by positive customer reviews averaging 4.7 out of 5 stars from over 260 users. They are not discontinued, so replacements are readily available.

If your mower deck isn’t a 61-inch Scag model, compatibility could be an issue. These blades are best suited for Scag mower owners looking for OEM mulching blades that maintain cutting performance and durability without needing upgrades or special adjustments.