MTD Replacement Part Flail Blade

What It Is

The MTD Replacement Part Flail Blade is a replacement blade for flail-style mower decks, designed to cut grass and light brush by swinging on a horizontal rotor rather than spinning like a standard rotary blade. It’s used on MTD-branded flail mowers, including some Troy-Bilt, Cub Cadet, and Yard-Man models with flail decks.

Fitment & Compatibility

Before buying, confirm your mower uses a flail deck (not a standard rotary blade)—this part won’t fit rotary mowers. Check the blade’s dimensions: 3.5” long, 1.5” wide, with a 7/16” mounting hole. It’s an OEM MTD part (part #490-601-0004), so it’s a direct replacement for models that originally used this blade. Verify your model number against MTD’s compatibility list or measure an existing blade—dimensions must match exactly. If your flail blade has a different hole size or length, this won’t work.

Key Things to Know

• Durability: Heat-treated steel holds up against rocks and debris better than cheap aftermarket blades, but still wears faster than rotary blades due to impact cutting.
• Installation: Moderate difficulty—you’ll need to access the rotor, remove retaining pins or clips, and replace each blade individually. A socket set and punch tool help.
• Common gotcha: Flail blades often come in sets of multiple blades per rotor; this listing is for a single blade. Count how many you need (typically 20–40 per deck) and buy accordingly.
• Balance: No balancing required like rotary blades, but ensure all blades are replaced evenly to avoid rotor vibration.

Should You Buy It

This is the right choice if you own an MTD flail mower and need an exact OEM replacement that fits without modification. It’s overkill for light-duty home use on standard grass, but essential for rough terrain, ditch banks, or mulching leaves where flail mowers excel. If you’re on a budget, aftermarket options exist, but this one offers proven durability and a 4.8-star rating for a reason.