Greenworks 2905203, Blade for 21" Mower, Black

What It Is

This is an OEM replacement blade for Greenworks 21-inch cordless and electric lawn mowers. It’s designed for standard mulching and bagging use, not for heavy-duty or commercial cutting.

Fitment & Compatibility

• Deck size: Only fits 21-inch Greenworks mowers. Measure your deck width to confirm.
• Model check: Compatible with most 21" Greenworks models, but verify your mower’s model number (e.g., 25022, 25142, 25252, 25312, 26062) against the part number 2905203.
• OEM vs aftermarket: This is a genuine Greenworks part, so it matches factory specs. Aftermarket blades may differ in hole pattern or thickness.
• Measurements: Blade length is 21 inches, center hole diameter is 1 inch, and the blade has a 2.5-inch offset. Check your old blade against these dimensions.
• What to check: Look at your current blade’s part number (stamped on the blade) or your mower’s manual. If you have a different brand or a non-21" deck, this won’t fit.

Key Things to Know

• Quality: Made from stamped steel—durable for residential lawns but not for rocks or thick debris. Sharp out of the box.
• Installation: Easy to swap with a socket wrench. Use a blade removal tool or block the blade to prevent spinning. Torque the bolt to 35-40 ft-lbs.
• Common gotcha: The blade is directional—make sure the curved edge points upward toward the deck. Installing it upside down will cause poor cut and vibration.
• Sharpening: Can be sharpened 2-3 times before replacement. Balance the blade after sharpening to avoid wobble.

Should You Buy It

If you own a 21-inch Greenworks mower and need a direct OEM replacement for mulching or bagging, this is a solid, no-hassle choice. It’s reliable for regular lawn care but not for heavy-duty or rocky terrain. For a cheaper alternative, consider aftermarket options, but verify fitment first.