21 Inch Mower Blade, 2 Pack Lawn Mower Blade Compatible with Greenworks 21 inch Mower Blade, Fits MO40L03,MO48L4422,MO40L4413,C3208101 Lawn Mower, Heavy Duty Sharp Replacement Blade

What It Is

This is a 2-pack of heavy-duty 21-inch replacement blades for Greenworks electric mowers. Designed for mulching, bagging, and side discharge, they restore cutting performance on worn or dull OEM blades.

Fitment & Compatibility

Before buying, confirm these three things:

• Deck size: Only fits 21-inch cutting decks. Measure your blade length—center hole to tip must be exactly 21 inches.
• Model compatibility: Works with Greenworks models MO40L03, MO48L4422, MO40L4413, and C3208101. Also fits most Greenworks 21-inch mowers with a 5-point star center hole and 1-inch diameter arbor. Check your owner’s manual or existing blade’s hole pattern.
• OEM vs aftermarket: This is a direct-fit aftermarket replacement, not Greenworks OEM. Quality is comparable, but verify the star pattern matches—some Greenworks models use a different center hole shape.

Key Things to Know

• Installation: Simple swap—remove the single bolt, replace blade, torque to 30–40 ft-lbs. No special tools needed beyond a socket wrench and blade removal tool (or block of wood to hold blade).
• Sharpness: Blades come sharpened and balanced out of the box. For heavy use, plan to sharpen after 10–15 hours of mowing.
• Gotcha: The 5-point star hole is specific to certain Greenworks models. If your mower uses a round or oval hole, these won’t fit.
• Durability: Heavy-duty steel resists bending on rocks and roots, but will dull faster on sandy soil or frequent mulching.

Should You Buy It

If you own a compatible Greenworks 21-inch mower and need a reliable, sharp replacement that won’t break the bank, this 2-pack is a solid value. It’s best for homeowners who mow weekly and want to keep a spare on hand. Skip it if your mower uses a non-star center hole or if you prefer OEM parts for warranty reasons.