MaxPower 561822B 2 Blade Set for Many 42 in. Cut John Deere Zero Turn Mowers Replaces OEM #'s GY20683, M170639, UC22008

What It Is

This is a set of two replacement blades for 42-inch cut John Deere zero-turn mowers, designed for medium-duty residential mowing. It replaces OEM part numbers GY20683, M170639, and UC22008.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: Must be exactly 42 inches. These blades will not fit 48-, 54-, or 60-inch decks.
• Blade measurements: Each blade is 20.5 inches long, 2.5 inches wide, with a 0.25-inch thickness and a 5/8-inch center hole with a 7/16-inch diamond-shaped drive hole. Measure your current blade to verify.
• Model compatibility: Fits many John Deere Z225, Z235, Z245, Z425, Z435, Z445, Z465, Z525E, Z535M, Z545R, Z645, Z655, Z665, Z725, Z735, Z745, Z755, Z925, Z935, Z945, Z955, Z965, Z975, and Z995 zero-turn mowers with 42-inch decks. Also fits some X300, X500, and X700 series with 42-inch decks. Check your owner’s manual for OEM part number GY20683, M170639, or UC22008.

Key Things to Know

• Quality: Made from heat-treated alloy steel for durability. Edge stays sharp through a full season of normal use, but may dull faster on sandy or rocky soil.
• Installation: Straightforward bolt-on replacement. Use a torque wrench to tighten center bolt to 70-90 ft-lbs. No special tools needed beyond a socket and ratchet.
• Common gotcha: These are not mulching blades. They produce a standard side-discharge cut. If you want finer clippings, look for a mulching blade set.
• Balance: Blades come pre-balanced, but always check balance after sharpening to avoid vibration.

Should You Buy It

If you own a 42-inch John Deere zero-turn and need a reliable, budget-friendly replacement that matches OEM specs, this set is a solid choice. It’s best for residential users who mow weekly and don’t need heavy-duty commercial blades. Skip it if you need mulching blades or have a non-John Deere deck.