(3) Toothed Mower Blades Fits John Deere X300 X320 X324 X350 X354 X360 Replaces M145476

What It Is

This is a set of three toothed (mulching) blades designed for select John Deere X300 series lawn tractors. They replace OEM part M145476 and are intended for mulching grass clippings into fine particles rather than side-discharging or bagging.

Fitment & Compatibility

Before buying, confirm your mower deck size—these blades fit 42-inch and 48-inch decks on models X300, X320, X324, X350, X354, and X360. The blade length is 18.5 inches, with a 1-inch center hole and a 0.5-inch offset. If your deck is 54-inch, these will not fit. Also verify your OEM part number: M145476 (John Deere) or equivalent. Aftermarket blades may vary in thickness or balance, so check that the blade thickness matches your original (typically 0.25 inches).

Key Things to Know

• Mulching vs. standard blades: Toothed blades chop clippings finer but may not perform well in wet, heavy grass—they can clog. Standard lift blades are better for bagging or side-discharge.
• Installation difficulty: Easy if you have a socket set and jack stands. Use a torque wrench to tighten the blade bolt to 70-90 ft-lbs (check your manual). Always disconnect the spark plug first.
• Balance check: Aftermarket blades sometimes arrive unbalanced. Spin test on a blade balancer before installing—vibration can damage the spindle.
• Common gotcha: The toothed edge can dull faster than standard blades, especially in sandy soil. Inspect every 10-15 hours of use and sharpen or replace as needed.

Should You Buy It

If you primarily mulch your lawn and own a compatible X300 series tractor with a 42-inch or 48-inch deck, this set offers good value at $52.55 with a solid 4.6-star rating. It’s a straightforward replacement for worn OEM blades, but if you bag or side-discharge often, stick with standard lift blades.