AB2100 21 Inch Mower Blade Replacement for 21" Electric Lawn Mowers, Compatible with Ego LM2100 LM2100SP LM2101 LM2102SP LM2142SP

What It Is

This is a 21-inch dual-edged mower blade designed for EGO’s 56V cordless electric mowers. It’s a direct aftermarket replacement for the OEM blade (part #AB2100) and is intended for mulching or bagging on 21-inch deck models.

Fitment & Compatibility

Check these before buying:

• Deck size: Must be 21 inches. This blade will not fit 20-inch or 22-inch decks.
• Model compatibility: Fits EGO models LM2100, LM2100SP, LM2101, LM2102SP, and LM2142SP. If you have a different EGO model (e.g., LM2000 series), measure your blade length and center hole diameter.
• OEM vs aftermarket: This is an aftermarket blade, not EGO OEM. Aftermarket blades may vary slightly in weight, balance, or steel thickness.
• Measurements: The blade is 21 inches long, with a 1-inch center hole and a 7-point star drive pattern. Confirm your mower uses this star pattern (most EGO 21-inch models do). If you have a round or D-shaped hole, this won’t fit.

Key Things to Know

• Installation difficulty: Easy. Use a 15/16-inch or adjustable wrench. No special tools needed. Torque to 40-50 ft-lbs.
• Quality: Steel is decent but may not hold an edge as long as OEM. Expect to sharpen or replace more often if mowing thick, rocky turf.
• Common gotcha: The blade is not reversible—both edges are sharpened, but the blade is directional. Install with the curved side pointing up toward the deck.
• Balance: Some users report needing to balance the blade after installation. Use a blade balancer or nail-in-wall trick to avoid vibration.

Should You Buy It

If you own one of the listed EGO 21-inch mowers and want a budget-friendly replacement (about half the price of OEM), this is a solid option. It’s best for light-to-moderate residential use on standard grass. For heavy-duty or frequent mulching, stick with OEM for longer edge life and better balance.