AB2100 Lawn Mower Blade for EGO 3705938001 21 Inch 56V Models LM2101, LM2100, LM2102SP, LM2100SP, LM2142SP

What It Is

This is a replacement 21-inch mulching blade designed for EGO 56V cordless lawn mowers, specifically models LM2101, LM2100, LM2102SP, LM2100SP, and LM2142SP. It replaces OEM part 3705938001 and is used for cutting and recirculating grass clippings.

Fitment & Compatibility

Before buying, confirm three things:

1. Deck size: Must be exactly 21 inches. Measure your blade length from tip to tip if unsure.
2. Model number: Only fits the EGO 56V models listed above (LM2101, LM2100, LM2102SP, LM2100SP, LM2142SP). Not compatible with 20-inch or other EGO models.
3. OEM reference: This is an aftermarket blade matching OEM part 3705938001. Check your old blade’s part number—if it’s 3705938001, this fits. Also verify center hole diameter (typically 1-inch) and offset pattern match your spindle.

Key Things to Know

• Quality: Aftermarket, but rated 5.0/5 from limited reviews. Expect comparable performance to OEM if steel thickness and balance are correct—inspect for warping before install.
• Installation: Easy with a socket wrench. Remove the blade bolt, replace blade, and torque to manufacturer spec (usually 35-45 ft-lbs). Use Loctite if vibration is a concern.
• Common gotchas: The blade is for mulching only—not for bagging or side discharge. If you need a different cutting pattern, this won’t work. Also, aftermarket blades may require rebalancing; check with a blade balancer or mark a nail in a vise.
• Maintenance: Sharpen after 10-15 hours of use. Replace if bent or chipped.

Should You Buy It

If you own one of the listed EGO 21-inch 56V mowers and need a direct replacement mulching blade, this is a cost-effective, well-rated option. Skip it if you require a bagging or high-lift blade, or if you prefer OEM parts for warranty peace of mind.