Toro 131-4547-03 Pack of 2 Mulching Blades

What It Is

The Toro 131-4547-03 is a factory OEM mulching blade set (two blades) designed specifically for select Toro TimeCutter and Titan zero-turn mowers. It replaces standard discharge blades to chop clippings into fine particles that decompose quickly, eliminating the need to bag or rake.

Fitment & Compatibility

Must-check before buying:

• Deck size: Fits 42-inch and 44-inch Toro fabricated decks only. Will not work on stamped steel decks or other brands.
• Model compatibility: Confirmed for TimeCutter SW4200, SW4400, SS4225, SS4400, and Titan MX4200, MX4400. Check your model’s serial number against Toro’s compatibility chart.
• OEM vs aftermarket: This is genuine Toro – exact fit and balance, no adapters needed. Aftermarket blades are cheaper but often require drilling or have thinner steel.
• Measurements: Blade length 16.5 inches, center hole 1 inch, thickness 0.204 inch. Measure your current blade to confirm.

Key Things to Know

• Installation difficulty: Easy (15-20 minutes). You’ll need a socket wrench and a block of wood to jam the blade. No special tools required.
• Lift and airflow: The wing design is aggressive – these blades create strong suction to lift grass for a cleaner cut, but they’re noisier than standard blades.
• Durability: Heat-treated steel holds an edge well, but hitting rocks or roots will still chip them. Inspect after each season.
• Common gotcha: These are not universal. Many users mistakenly buy them for 46-inch or 50-inch decks. Measure your blade length before ordering.

Should You Buy It

If you own a Toro TimeCutter or Titan with a 42- or 44-inch fabricated deck and want a factory-perfect mulching upgrade that eliminates bagging, this is the right choice. It’s not for other brands or deck sizes, and it’s pricier than aftermarket options, but the fit, balance, and cut quality justify the cost for frequent mowers who prioritize a clean, mulched finish.