21inch Mower Blades Replacement for Greenworks MO60L01 & Kobalt KM2180B-06 80V 21'' Mower,Fit MO40L4413 MO40L03 MO48L4422 C3208101 KM-2041B-06 KM-5040-06 KM5080-06,2Pack

What It Is

This is a 2-pack of replacement 21-inch mower blades designed for electric 80V cordless mowers, specifically the Greenworks MO60L01 and Kobalt KM2180B-06. They’re also compatible with several other 21’’ Greenworks and Kobalt models.

Fitment & Compatibility

Before buying, confirm your mower deck size is exactly 21 inches. These blades fit the following models: Greenworks MO60L01, MO40L4413, MO40L03, MO48L4422, C3208101; and Kobalt KM2180B-06, KM-2041B-06, KM-5040-06, KM5080-06. They are aftermarket replacements, not OEM. Measure your current blade’s center hole diameter (usually 1 inch or 25.4 mm) and overall length (21 inches). Also verify the blade mounting pattern—these use a standard 5-point star center hole. If your mower uses a different center hole shape (e.g., round or oval), these won’t fit.

Key Things to Know

• Quality: Made from hardened steel with a protective coating to resist rust. Sharpness is good out of the box, but edge retention is average—expect to sharpen after 2–3 seasons of regular use.
• Installation: Easy DIY job with a socket wrench. Disconnect the mower battery first, remove the center bolt, swap blades, and torque to 35–45 ft-lbs. No special tools needed.
• Common gotcha: These blades are slightly lighter than OEM, which can reduce mulching effectiveness on thick, wet grass. For best results, keep them sharp and mow dry grass.
• Balance: They come pre-balanced, but it’s worth checking with a blade balancer before installing to avoid vibration.

Should You Buy It

If you own one of the listed Greenworks or Kobalt 21-inch 80V mowers and need a budget-friendly replacement for regular cutting (not heavy mulching or bagging), this 2-pack is a solid value. Skip it if you want OEM accuracy or if your mower has a different center hole design.