MowerPartsGroup (3) Lawn Mower Blades for John Deere 48" Z425 X300 X320 X350 UC22009 M145476 M127500 M127673

What It Is

This set of three replacement blades is designed for 48-inch John Deere lawn tractors and zero-turn mowers, including the Z425, X300, X320, and X350 series. They’re suited for regular residential mowing—mulching, bagging, or side discharge—on medium-duty turf.

Fitment & Compatibility

Before buying, confirm your mower has a 48-inch deck—these blades won’t fit smaller or larger decks. Check your owner’s manual or current blade part numbers: these replace OEM UC22009, M145476, M127500, and M127673. Measure your existing blade length (should be roughly 18 inches) and center hole diameter (typically 1 inch) to be sure. MowerPartsGroup blades are aftermarket, not John Deere OEM, but they match OEM specs for bolt pattern and thickness. If you have a Z445 or X350 with a 48-inch Edge™ deck, these should work—but double-check the blade spindle orientation (some older models use a different offset).

Key Things to Know

• Quality: Made from heat-treated steel, similar to OEM in durability. Reviews note they hold an edge well for a season of typical use.
• Installation difficulty: Easy—requires a socket wrench and blade removal tool or block of wood to prevent spinning. Torque blade bolts to 35–40 ft-lbs (check your deck manual).
• Common gotchas: These are not mulching-only blades; they work for mulching but don’t have the high-lift fins of dedicated mulching blades. For bagging, they’re fine—but for heavy wet grass, you may get clumping. Also, balance-check each new blade before install (use a simple blade balancer).
• Set includes three blades, so you won’t need to buy a separate set for a triple-blade deck.

Should You Buy It

If you need a reliable, cost-effective replacement for a 48-inch John Deere deck and don’t require OEM branding, this set is a solid buy—good value for the price, with strong reviews for fit and cut quality. Avoid it if you run a commercial mower or need high-lift blades for heavy wet conditions; in that case, go with OEM or a premium aftermarket brand.