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

What It Is

This is a set of three replacement mower blades designed for 42-inch and 48-inch cutting decks on select John Deere X300 Series garden tractors. They are direct replacements for OEM part M145476 and are intended for mulching, bagging, or side-discharge mowing.

Fitment & Compatibility

Before buying, confirm your John Deere model and deck size. This set fits: X300, X320, X324, X350, X354, X360. It also fits the 42-inch (M145476) and 48-inch (M145479) decks. Measure your blade length—these are 14.5 inches long with a 1-inch center hole and 3.5-inch blade offset. If your deck uses a different spindle pattern or blade length (e.g., 54-inch deck), these won’t work. Aftermarket blades are not OEM; check the blade thickness (0.203 inches) against your current blades to ensure proper balance and deck clearance.

Key Things to Know

• Quality: These are heat-treated, hardened steel blades. They’re durable but may need sharpening more often than OEM blades, especially in sandy or rocky soil.
• Installation difficulty: Easy—requires a wrench and a blade removal tool (or a block of wood to hold the blade). Torque the center bolt to 40-50 ft-lbs. Always disconnect the spark plug first.
• Common gotcha: The blades are a direct replacement, but aftermarket blades sometimes have slightly different balance. If you feel vibration after installation, remove and re-check balance on a blade balancer.
• Set includes three blades—one for each spindle. Some sellers list a single blade; this listing is for a full set of three.

Should You Buy It

If you need a cost-effective, quick replacement for worn or damaged blades on a 42- or 48-inch X300 series deck, this set is a solid choice. It’s not for high-volume commercial use or for decks outside the listed models, but for residential mowing, it offers good value and reliable performance.