Set of 3 Mulching Blades 16.93" Replacement for John Deere M145476 M127673 M127500 UC22009 Fits 48-Inch Mower Deck X300 X320 X350 Z425 Z355R, 0.81" Center Hole

What It Is

This is a set of three 16.93-inch mulching blades designed to replace John Deere OEM part numbers M145476, M127673, M127500, and UC22009. They are intended for use on 48-inch mower decks on select John Deere X300, X320, X350, Z425, and Z355R tractors and zero-turn mowers, providing finer grass clippings for nutrient recycling.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 48 inches (not 42 or 54). Measure your existing blade length—must be 16.93 inches—and center hole diameter must be 0.81 inches. This set is aftermarket, not OEM John Deere, so check that your model is listed: X300, X320, X350 (200-series), Z425, Z355R. For other models, cross-reference the OEM numbers above. Also verify the blade thickness matches your spindle (typically 0.25 inches for these decks).

Key Things to Know

• Quality: Aftermarket steel may be slightly softer than OEM, but for residential mulching, these hold up well. Expect faster dulling in sandy or heavy-use conditions.
• Installation: Straightforward if you have a torque wrench—tighten to 50–60 ft-lbs. Use a blade removal tool for safety. Lift deck and disconnect spark plug first.
• Common Gotchas: The 0.81-inch center hole is standard, but some aftermarket blades have slightly off-center holes—check alignment on one blade before installing all three. Also, mulching blades require higher lift, so they may reduce bagging efficiency.
• Balance: Out of the box, check blade balance with a balancer. Unbalanced blades cause vibration and spindle wear.

Should You Buy It

If you own a compatible 48-inch John Deere deck and want a budget-friendly mulching upgrade for residential use, this set is a solid pick. It’s not for heavy commercial cutting or if you need OEM-grade longevity, but for the price, it delivers good clip quality and easy installation. Skip it if you primarily bag or prefer premium steel.