SCITOO 1pc 21 Inches Deck Mower Blades for 56V Models LM2101/LM2100/LM2102SP/LM2100SP/LM2142SP Replacement for AB2100 AB2101

What It Is

This is a set of three 21-inch replacement mower blades designed for 56V electric lawn mowers, specifically for cutting grass on residential lawns. The SCITOO blades fit Greenworks/Greenworks Pro models LM2101, LM2100, LM2102SP, LM2100SP, and LM2142SP, as well as AB2100 and AB2101 units.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 21 inches (measure the blade mounting hole to tip, not the deck itself). These blades are aftermarket replacements, not OEM Greenworks parts, so check that your original blade’s center hole shape (usually oval or star) matches this set’s mounting pattern. Measure your old blade’s thickness (typically 0.2–0.3 inches) and thickness of the center hole—SCITOO blades are standard for these models but variations exist. If your mower uses a single blade, these are for a three-blade system; verify your deck has three spindles. Models listed (LM2100 series, AB2100/AB2101) are confirmed compatible, but double-check your exact model number on the mower’s sticker.

Key Things to Know

• Quality vs OEM: At $15.50 for three blades, these are budget-friendly, but some users note they may dull faster than OEM Greenworks blades—expect to replace more often.
• Installation difficulty: Easy swap if you have a socket wrench and blade removal tool. Ensure you torque to manufacturer specs (usually 30–40 ft-lbs) and use a thread locker to prevent loosening.
• Balance check: Aftermarket blades can be slightly unbalanced out of the box. Test balance on a blade balancer before installing to avoid vibration that damages the spindle.
• Common gotcha: The center hole design may differ from OEM—measure your old blade’s center hole shape and size to avoid fitment issues. Some users report needing to file the hole slightly for a snug fit.

Should You Buy It

Buy these if you own one of the listed 56V Greenworks models, want a cheap three-pack for routine blade swaps, and are comfortable with basic installation and balance checks. Skip them if you need OEM-grade durability for heavy-duty or frequent mowing—they’re best for light-to-moderate residential use.