Toro Genuine OEM Mulching Blade 131-4547-03 131454703 (Replaces 108-9764-03) for 22in / 55cm Recycler Lawn Mower Including Newer Units 21472 21465 21464 21462 21447 21445 21442 21378 (1)

What It Is

This is a Toro Genuine OEM mulching blade (part #131-4547-03) designed specifically for 22-inch (55cm) Toro Recycler lawn mowers. It replaces the older 108-9764-03 blade and is intended for use on newer models (e.g., 21472, 21465, 21464, 21462, 21447, 21445, 21442, 21378) to produce fine clippings for mulching without bagging.

Fitment & Compatibility

• Deck size: Only fits Toro 22-inch (55cm) decks—do not use on 21-inch or other sizes.
• Model check: Confirm your mower model number (e.g., 21472) on the underside of the deck or in the manual. This blade is for Recycler series units, not standard side-discharge or rear-bag models.
• OEM vs aftermarket: This is a genuine Toro part, so it matches factory specs exactly. Aftermarket blades may require hole reaming or have slight thickness differences.
• Measurements: Blade length is 22 inches, center hole diameter is 1 inch, and it has two drive pins (not a star pattern). Verify your blade’s existing measurements before ordering.

Key Things to Know

• Installation difficulty: Easy—requires a socket wrench and a 5/8-inch socket. Torque to 30-40 ft-lbs (check your manual). No special tools needed.
• Mulching performance: The curved design and high-lift wings create a vacuum for fine clippings. Works best with sharp blades and dry grass; wet grass may clump.
• Common gotcha: The drive pins (two small holes on either side of the center hole) must align with the adapter on your mower. If your old blade has a different pin pattern, this won’t fit.
• Durability: Heat-treated steel lasts a full season with regular sharpening. Expect 25-30 hours of cutting before needing a refresh.

Should You Buy It

Buy this if you have a Toro 22-inch Recycler (model numbers listed above) and want reliable, OEM-matched mulching performance. It’s ideal for homeowners who prefer mulching over bagging and want fine clippings that decompose quickly. Skip if you have a different deck size or need a bagging or side-discharge blade.