Wadoy 21 Inch Mower Blade 2 Pack Compatible with Greenworks 21 Inch,Replacement Part for MO40L03,MO48L4422,MO40L4413

What It Is

This is a two-pack of 21-inch replacement mower blades designed for Greenworks cordless and electric walk-behind mowers with a 21-inch cutting deck. They are intended for regular blade swaps to maintain clean, efficient grass cutting.

Fitment & Compatibility

Before buying, confirm your mower has a 21-inch deck and that the blade mounting pattern matches. These blades are listed as compatible with Greenworks model numbers MO40L03, MO48L4422, and MO40L4413. The blade center hole is a star-shaped (5-point) pattern – not a standard round or oval hole. Measure your existing blade’s length (from tip to tip) and check the center hole shape. If your Greenworks model isn’t listed, verify the star pattern and overall length (21 inches). These are aftermarket blades, not OEM Greenworks parts, so fitment may vary on older or less common models.

Key Things to Know

• Quality: Made from heat-treated steel with a protective coating; reviews indicate they hold an edge well for the price, but may not last as long as OEM blades in heavy use.
• Installation: Easy to install – just remove the center bolt, swap blades, and torque to spec (typically 30-40 ft-lbs). Use a blade stop or block to prevent spinning.
• Balance: Some users report needing to balance blades before first use; check with a blade balancer to avoid vibration.
• Sharpness: They come sharp but not razor-edged; a quick touch-up with a file is beneficial for a cleaner cut.

Should You Buy It

If you own a compatible Greenworks 21-inch mower and want a cost-effective, reliable blade replacement, this two-pack is a solid choice. It’s ideal for routine seasonal swaps, but if you mow very thick or wet grass frequently, consider OEM blades for longer durability.